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NM’- 25, .1946-
4 w. T. STEPHENS
2,41 1,837
' FULL CYCL-E HYDRAULIC VALVE
Filéd Sept. 28, 1944
4 S>heets—Sheet 1
WHZK v0
:1 HAN/MM
WILLIAM T. STEPHENS .
FQQ
Nov. 26, 1946.
_ w. T. STEPHENS
-
= 2,411,837 '
FULL CYCLE HYDRAULIC VALVE
Filed Sept. v28, 1944
Sheets-Sheet 2
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WILLIAM T- STEPHENS
PQQ
vNov. 26, 1946.
w. T. STEPHENS
"
2,411,837
FULL‘ CYCLE HYDRAULIC‘VALVE -
Filed Sept. 28, 1944
‘R
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4 SheetSV-Sheet 3
jwuc/n tom
WILLIAM ISTEPHENS
Sate-M4445 ’
Nov. 26, 1946.
w. .T. STEPHENS
2,411,837
FULL CYCLE HYDRAULIC VALVE
Filed Sept. 28, 1944
I
'
1 4 Sheets-Sheet 4
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3mm
K
ILLlAM TSTEPHENS '
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Patented Nov. '26, 1946
s PATENT cries ~
v “UNITED ‘
' 2,411,837
FULL CYCLE nmaamo VALVE
William '1‘. Stephens, Cleveland, Ohio,’ assignor ’
to Hydraulic Control Engineering Company,
Cleveland, Ohio, a corporation of Ohio
‘
Application September 28, 1944, Serial No. 556,191
' ' 15 Claims.
(Chill-52)
This invention relates to automatic cycling hy
fall within the scope of the appended claims with
out departing from the spirit of the invention.
draulic systems and to automatic full . cycling
valves for use with such systems.
-
.
In said drawings:
It is a general object of the present invention
I to provide a novel and improved automatic cy
cling system for hydraulic presses orlthe like-and
'
Figure 1 is a side elevational view of a full cycle ’
G1 hydraulic valve assembly constructed in accord
ance 'with the present invention‘ and schemat- ‘
a fully automatic cycling valve for use with same.
ically illustrated as connected into a system in
Morelparticularlyiit is an object of the inven
cluding a hydraulic press or ram, 9. ?uid pump
tion to provide a fully automatic cycling system
and a tank or reservoir;
7
,
~
a
for hydraulic presses and like devices in which 10
Figure 2 is a central vertical section through
the cycling’ is effected solely by changes in pres
the valve assembly of Figure 1 illustrating the '
sure in the operating liquid and without resort,
operating and control plungers of the same in the
to mechanical association with any moving‘ parts
of the press.
,
'
_
Another important object ‘:of the invention con
sists in the. arrangement of a fully automatic cy
clingwvalve arranged to be initiated in operation
neutral or inoperative position;
press;
Figure‘4 is a further view similar to Figure 2 '
but illustrating the valve plungers in the power
‘ for each cycle by manual movement of a part
thereof and to thereafter carry out the various
7 I phases of the cycle by pressure variation actua
tion of a movable plunger therein which also con
trols the ?ow-of liquid for the operation of the
press.
>
'
'
_
20
unloading positions, 'and
'
An important, feature of the invention resides
:
in the step-by-step movement of a control 25
b , plunger as the .?uid pressures deliveredfrom the
'
Figured is a view identical with Figure 2 but ‘'
15 illustrating the valve plungers in the positions,
required for the power loading operation of the
'
-
Figure 5 is 'a fragmentary view of a modi?ed.
form of the valve for use in a system where the
[source of power is an accumulator instead of a
pump.
'
In the use of hydraulic machinery such as do‘u-I
ble acting rams, hoists, presses and the like, there
source increase and decrease, which plunger reg
are many occasions when it is desirable to control ‘
ulates the deliveryv of the liquid for operating the ' the entire cycle of operations with *but a single
press throughout the ‘several phases of its full, ' initiating movement of the control mechanism.
cycle and which thenresets the manually manip 30 An example of this might be in the operation of‘
ulated starting plunger ready for a further cy
a hydraulic press/where, after initiating move
cling operation.
l
'
ment, the press plunger moves to the full extent
Another important feature of the invention
permitted upon its downward stroke and is then '
consists in the-provision of an automatic cycling
automatically withdrawn and returned to aneu
valve having a manually initiated operating in- GI tral or starting position and the control mecha
plunger and an automatic pressure actuated con
' nism reset to stop movement of the press andprei
trol plunger, together with a relief valve set to
‘ open when the pressure of-the ‘operating liquid
becomes excessive,‘ the ?uid delivered from the
relief- valve providing for‘ the actuation of the
control valve.
.
-
V
_
A still further important’ featureof the inven
‘ tion consists ‘in the stepped operation of the con- _
‘ trol valve by interrmittent pressure excesses each
of which is quickly reduced as a result of the-con
pare’ the assembly for another initiating opera-'
_ _
'
.tion.‘ Many e?orts have been made to provide a
control of the type described, but most of them
have been ine?icient or too costly or. complicated
and most of them have depended, for fullcontrol- -
of complete cycling, on some mechanical associ
ation with a moving portion of the press ram. .
I In accordance with the present invention a
45 fully automatic independent control valve is pro
sequent movement of therelief valve to initiate ‘ " vided which, upon an initiating operation, causes
another phase of the press operating cycle.’
the press or ram to be extended to perform its '
work, to be retracted in the'normal sequence'of, f
invention will be more apparent to those skilled’ 1.50 movement and then stopped after the cycle of.
Other and further objects and features of the -
in the art upon a consideration of'the accom
panying drawings and following speci?cation
wherein are disclosed two exemplary embodi
ments of the invention with the understanding
that such modi?cations maybe made therein as
movements has been completed; Furthermore, .
\ vthe valvethen resets itself ready for another'cyi
ole. As the description proceeds it will be clear
that the cycle controlis' not at all dependent on;
~ any timed sequence oi‘events but rather is de
pendent on the" changes in pressures resulting
2,411,887 ,
3
from the press plunger reaching the limits of its
movements in either direction. These limits may
be determined by the stroke of the press or the
resistance of the material being operated on.
'
Referring now to the drawings for a better
understanding of the invention and ?rst to Fig
ure 1, it will be seen that in the schematic por
tion of the view the cylinder of a hydraulic press,
hoist or the like is shown at H), with the plunger
and its piston rod indicated in dotted lines at lil. 10
Movement of this ‘plunger to the left is considered,
for the purposes of this description, as the load
ing or power stroke whereas movement to the
right is the unloading stroke. The right hand end
of the press cylinder which receives liquid to pro 15
vide the loading stroke is connected by pipe l2
to port H in the housing of the fully automatic‘
cycling valve l5 forming the subject matter of this
4
enlargement of bore 32 just to the right of pas
sage 58. Bore 32 is further intersected .by cham
bers BI and 62' connected respectively to valve
housing ports I4 and I6 leading to the two sides
of the hoist cylinder.
The operating plunger 34 comprises three sets
,of spaced lands 63, 84 and 65 each capable of
completely closing off the bore against longitu
dinal ?ow. Lands 63 and 64 are spaced by cir
cumferential groove 68 and lands'64 and 65 by
circumferential groove 88. For its full length the
operating plunger 34 is provided wit-h a relatively
small diameter bore"!!! adapted to slidably ac
commodate a valve rod ‘H having a close work
ing ?t therein. .On its left hand end this rod
mounts a poppet head ‘I2 adapted-to seat in the
open end of bore 10 and close the same.
The
space of reduced diameter behind this head has
communication with a groove 14 in valve rod ‘II
der is likewise connected by a suitable pipe to 20 by virtue of a milled ?at 13 between the two.
Relative movement between the valve rod and the
valve housing port It. The valve housing has
operating plunger 34- is permitted by spacing the
two additional ports I8 and 28, the former being
stop washer 18, which is held in position on the
connected by pipe l9 to the discharge side of
invention.‘ The opposite end of the press cylin
_ pump 22, which in most- instances is of the con
end of. the valve rod by operating knob 11, at a
.18 from thereduced diameter end of
stant volume, positive displacement type. Port 25 distance
the operating plunger. This reduced diameter
28 is connected by pipe 23 to a reservoir or tank
24 capable of holding a supply of liquid sumc'ient
to at least fill the cylinder of the press. The pump
is counter-bored to receive the packing 19 for the
valve rod and for the spring 80 which not only
maintains the poppet-head 12 against its seat but
22 has its inlet pipe 25 connected to tank 24
.
,
whereby it is continuously supplied with liquid. 30 positions the packing. I .
The control plunger is somewhat more com
In Figure 2 the valve assembly is illustrated in’
plicated and has its left end hollow for a substan
its entirety, the housing l5 being sectioned ver
tial distance to receive the spring 82 whose left
tically through the centers of the two horizontal
end abuts the bottom of recess 43 in plug 42.
bores 38 and 32 therein which provide, respec~
tively, for the reception and reciprocation of the 35 This spring normally maintains the plunger
cylindrical operating plunger 34 and the cylindri- ’
cal control plunger 35.
The upper bore 38 extends clear through the
valve housing and is closed at the left hand end
against the inner face of plug 44 as shown in
Figure-2. A plurality of radial holes 83 near the
, inner end of the spring receiving chamber in
plunger 35 provides for movement of the liquid
by a screw plug. The right hand end of the bore 40 trapped in the end of bore 32 into chamber 60
at its junction with the outer surface‘of. the hous
ing is recessed to receive a ?uid-tight packing 37
which is secured in position by a perforated cup-'
like member 38 having the added function of co
operating with a shoulder 48 on valve plunger 34
to limit its movement to the right, as illustrated
in this ?gure.
which is at all times in communication with the
tank, via 59, thus preventing liquid lock of the
plunger. Valve plunger 35 has four sets of lands
84, 85, 88 and 81. Between 84 and 85 is groove
88. Between'lands 85 and 88 is groove 89, and
between lands 86 and 81 is groove 98.
The right hand endiof plunger 35 is longi
tudinally bored and counter-bored, the smaller
inner‘bore
loosely receiving the hollow stem 9|
the housing, is somewhat longer at the left by
virtue of the extension cast integral therewith at 50 of relief valve 82, the head of which seats at the
junctions of the two bores. It is seated under
4l,.and is closed at this end by a cap 42 having
the action of the heavy spring 93 housed in. the
a well or recess 48, and at the right end by plug
larger
bore and abutting against closure cap 94
44 forming a stop to limit the movement of the
in the end of the plunger.» This cap is centrally
control plunger 35 tothe right. In a similar manperforated as at 85. The inner end of the smaller
ner the opposite end of the control plunger is,
portion of the plunger bore is'co'nnected by radial
under certain conditions. stopped against the in
ports 98 to groove 89. The hollow central por
ner annular face of cap 42.
tion of the plunger and the central passage in
The upper bore 30 is intersected by a plurality
of passages and ducts beginning with one at the . the relief valve are connected by radial ports
extreme left end and numbered 58. Next toward 60 91 to the surface of the stem so that ?uid passing
longitudinally through the stem may move out
the right is duct 5| extending upwardly into‘
into the larger bore which houses spring 83 when
chamber l8’ connected with the pump port I8.
the valve is forced open under a pressure suf?
Next is duct 53' widening toward the top into
cient tovcause spring 83 to yield.
chamber 28' connected to port 20. The narrow
The valve operates as follows, with the parts
. web 54 separates these ducts The last or right 65
in the positions shown in Figures 1 and 2: Oper
hand passage 55 extends downwardly to the right
ation of thejpump delivers liquid through pipe I8
hand end of bore 82.
and port 18 into chamber 18' where it passes to
Left hand vertical passage 58 extends aroun
chamber 28' through groove 88 in operating
' bore 32 so that it is not closed off by any portion
of valve plunger 35 and Joins horlzontalpassage 70 plunger 34 which now spans these two chambers.
In this ' neutral or bypassing position of this
58 which connects into vertical passage 51 inter-_
plunger no work is being performed and the pump
secting chamber 58 surrounding bore 32 immedi
is relieved of operating against any.‘ pressure,
ately to the left of passage 55. Duct 58 extends
merely circulating» the liquid to and from the
‘around bore 32 and connects with horizontal pas-v
, cage 58 which leads to chamber 88 forming an 75 tank. ‘.All passages and ports in the valve are
The bore 32 likewise extends entirely through -
assumed to be vfull of oil or other'hydraulic ?uid.
In order to initiate operation of theram or
‘press the operating knob or button ‘llv is pressed
toward the left compressing spring 88,, lifting
poppet 12 from its seat and allowing oil trapped
in closed chamber 30 to the left of plunger 84
to‘passinto bore ‘I8 along the passage 13 into
groove 14 and hence out through radial ports 14’
into groove 68. communicating with chamber
6
.
. tank. Under these conditions the direction of
movement of the ram plunger is reversed and
, movement continues until it- reaches the upper
end of its stroke and is stopped against the upper ' '
cylinder head;
_
The pump pressure now again begins to build
up and ?uid passes from 5| through groove 89'
into passages orports 96 again lifting relief valve
, 82 from its seat and delivering a further quantity
20’. This permits continued pressure on knob ‘ll 10 of oil into the right hand end of bore 32 moving
to‘move the operating plunger 34 to the left until
washer l6 beneath the knob engages against the
outer face of cup 38 stopping this operation.
the control plunger 35 to the left until it is
stopped from further movement by cap 42. When
this happens the land 81 at the extreme right of
When the knob is now released the valve rod is
the control plunger moves to'th'e left of the en
moved to the right underv the action of its spring. 15 trance to passage 51 which is already full of oil,
88 closing the poppet.
,
and oil issuing from 95 at the end of the control
As seen in Figure 3, the ?rst result of move
ment of the operating plunger 84 is to place land .
plunger builds up the pressure in 51 and, con
.nected passages 56 and 58 as well as in the left
54 in the opening in partition 54 and close off
hand end of operating plunger bore‘3ll. This acts
communication between l8’ and 28' so that liquid, 20 on the end of this later plunger and moves it to
pressure is'built up induct 5| by the action of
the right as far as is permitted by its limit stop.
the pump. At the same time land 65 now closes
This movement of the operating plunger performs
off communication between passage 55 and cham
three functions. First, it returns it to its neutral
ber 28'. ‘High pressure ?uid in 5| passes by way
position ready for the next operation. ‘Second, it
of groove 89 in control plunger into chamber 6|
moves groove 66 to span chambers I8’, 20', thus
connected to hoist port |4 applying high pressure
relieving the pump to deliver only to the tank.
?uid to, the right side of the ram plunger ||.
Third, it connects chamber 28' and passage 55
The control plunger 35 is still in the position
through groove 88 permitting the oil under pres
illustrated in Figure 2, and while high pressure
sure in the right end of the control plunger pas
fluid can be delivered to the ram none can be 30 sage to ?ow back to the tank under the action of
returned from the opposite side to permit it to
move since ‘chamber- 82-, connected to ram port
I6, is completely closed oil by lands 84 and 8'5
engaging in the bore 32 on both sides of the
same. Continued operation of the pump with no
?ow builds up pressure in- duct 5| which enters
through radial ports ,96, lifts relief valve 82 from
‘its seat and permits thishigh pressure liquid to
, enter the spring chamber in the control plunger
and issue through end port 95, therein and build
up a pressure in passage 55 and the end of bore
32 which forces the control plunger 35 toward
the left‘ until it assumes the position indicated in ,
Figure 3. Under these conditions land 84 has
moved out of the bore 32 between chamber 68
and‘82 and ‘?uid can return from the ram or
press by ?owing into 52, through groove 88 into
chamber 60 and thence through passage 59 and
‘duct 53 to chamber 28' and back to the tank.
The excess back;pressure being relieved by ?ow
of liquid to the ram, the relief valve 92 closes and
control plunger remains stationary. in the position
' shown in Figure 3 since the, liquid at its right
cannot escape.
,
'
.
This condition maintains during the full stroke
the spring 82 biasing the control plunger to the
right _ so that this plunger now returns to its
normal or neutral position. The parts are now all
in the positions indicated in Figure 2 ready for
recycling, which operation must be initiated by
again pressing the knob 11 to the left and moving
the valve rod and operating plunger.
'
It will be seen that except for the initial re
quirement for positioning the knob 11 to start the
operation cycle, the valve assembly has auto
matically functioned to control their whole cycle
and has performed all or this without further
attention by the operator. Rates of movement of
the press ram in either direction can be readily
controlled by restricters or suitable valves where
' necessary.
The number of parts in the auto
matic cycling valve has been maintained rela
tively small and their design is extremely simple
and comparatively inexpensive. All parts of the
valve housing can be made by casting, coring‘and
drilling while all parts of the several plungers
and stems can be made by simple boring and tum
ing operations.
_
-
‘
'
,
The device is compact and occupies but little
more'space than the usual manual control valve.
of'the ram or until its movement is resisted to ' _ Noiadditional piping is required for its operation. -
an extent such that the pump pressure again
builds up‘to a point where it can lift relief valve
82. This may happen if the load on the ram is too ‘
great, or when it reaches the end ‘of-the’ stroke
and engages against the cylinder head. What
ever the cause, valve 82 is again lifted, high pres
~ sure ?uid flows through port 95 and adjusts the
control plunger toward the left until it‘ assumes
The single use of the invention as described, in
‘ this speci?cation has merely been exemplary vand
obviously many other situations for the valve are
available. In addition 'to the operations which it
performs as already described‘it has additional
safety factors. Movement of the ram or plunger
can be instantly stopped at any point in its power
loading or power unloading strokes by manually
the_ position illustrated in Figure 4 conditioning 65
retracting the operating plunger by pullingon its
the valve for returning the plunger of- the ram.
The control plunger 35‘ has now moved suille
ciently far to the left to cut off chamber 6|
from duct 5|_ through which high ?uid pressure
knob 17. This will return‘ all parts, to the posi
tion illustrated in l'f‘igure 2 in the same manner
as described in the sequence following the power
enters and this duct isinow connected through 70 unloading operation, except‘ that the operating
groove 88 with chamber 62 leading by way of
party IE to the opposite end of the ram. At the
same'time 'chamberil from the power end of the
plunger is moved manually instead of by pressure
on its left end. Liquid for ?ll-in behind the .left
end of the, plunger is available through 58, 58,_
51, groove 88, duct 58 and the tank. The control
duct "leading to chamber 20' and back to the 75 plunger ‘also assumes its neutral position and
- ram is' now connected by way of groove‘ 90 with
I)
2,411,837
since in this position it prevents the return of
rections, a pump for delivering liquid 'under pres
?uid from the left end of the ram or the delivery
of any ?uid to that end of the ram, it will be
seen to be locked in whatever, position it has
cycle hydraulic valve comprising a housing hav
ing a port for connection to the pump outlet, a
reached when stopped. Upon again initiating
~ operation, by suitable pressure on knob 11, the
ram will resume movement. If it is stopped on
the loading stroke it will continue ioading,.but
sure and a tank or reservoir for liquid, of a full
port for connection to the tank and two bores, an
operating plunger reciprocably mounted in one
bore, a control plunger reciprocably mounted
in
the
other
bore
and
biased
to
one end
thereof, each plunger‘ having lands and grooves,
if ‘it is stopped on the unloading stroke it will
start loading and then resume its normal cycling. v10 each bore being intersected by passages and ducts
from said ports controllable and variously con
To adapt the valve for use with accumulator
systems where the source of high pressure ?uid is “ nectable by said grooves, a relief valvealways
connected by one of said ducts with the pump
an accumulator the simple changes illustrated
port,
means to bias said relief valve shut, means
in Figure 5 are all that are necessary. It will be
appreciated that a through bypass in the neutral 15 to conduct liquid discharged from the relief valve
when the pump pressure becomes excessive to
or inoperative position of the valve is undesir
one end of the second bore beyond the control
able, since it would permit unloading of the
plunger to move the same against its bias, and
accumulator and not permit full- utilization of
means under control-of the operating plunger
the advantages of the same whereby the pump can ‘
be run intermittently instead of continuously as 20 to vent liquid from the'opposite end of the second
bore to said tank port.
is customary where the accumulator is not used.
3. The combination with a double acting hy
In Figure 5 chamber I82 is connected by way
draulic press or the like having a piston capable
. of the port to the accumulators whereas cham
of limited movement in loading and unloading di
ber 202 is connected to the tank 24 as in Figure l.
rections, a pump for delivering liquid under pres
25
Duct 5|”, however, is not continuous with or con
_ sure and a tank or reservoir for liquid, of a full
nected to 182 as in Figure 2. The two are offset
cycle hydraulic‘valve comprising a housing hav-_
and slight modi?cations have been made in the
ing a port for connection to the pump outlet, a
groove 662 in operating plunger 34* primarily
port for connection to the tank and two bores, an
by extending it more to the left. In the neutral
operating plunger reciprocably mounted in one
position of the operating‘ plunger this groove 662 30 bore, a control plunger reciprocably mounted in
spans 5|2 and 202 but, shuts of! passage l8=by
the other bore, each plunger having lands and
means of land 63”. This results in stopping any
grooves, each bore being intersected by passages
?ow of ?uid from the accumulator when the
and ducts from said ports controllable and vari
plunger is in the neutral position. There is no
~ously connectable by said grooves, a relief valve *
35
?ow by this valve plunger until it moves to the
mounted in said control plunger and always con
> operating position to ‘the left, when groove 86”’
nected by one of said duets with the pump port,
spans ill2 and I82 and is taken out of communi
means to bias said relief valve shut, means to
cation with 202 which is separated now by means
conduct liquid discharged from the relief valve
of land 64*’. Under these ‘conditions high pres
when the pump pressure becomes excessive to
40
sure liquid can enter passage ill“ but is blocked
one end of the second bore beyond the control
from chamber 20’, going back to the reservoir.
plunger to move the same, and means to vent
_From here on the action of the valve is identical
liquid fromthe opposite end of the second bore
‘to that as described in connection with Figures
to said tank port, said control valve being ar
2, 3 and 4 except that in the- ?nal action of 45 ranged to connect certain of said passages and
returning the operating plunger to its extreme
ducts during said movement to reduce the pump
right position the ?ow of ?uid from the accumu
pressure below that necessary to actuate the relief
lators is again out off instead of being allowed
. valve whereby movement of the control valve is
stopped.
to pass at zero pressure. to the reservoir.
4. The combination with a double acting hy
I claim:
,
,
50
l. The combination with a double acting hy
draulic press or the like having a piston capable
of limited movement in loading and’ unloading
directions, a pump for delivering liquid under
pressure and a tank or reservoir for liquid, of a
full cycle hydraulic valve comprising a housing
having a port for connection to the pump outlet,
a port for connection to the tank and two bores,
an operating plunger reciprocably mounted in one
draulic press or the like having a piston capable
of limited movement in loading and unloading
directions, a pump for delivering liquid under
pressure ‘and a tank or reservoir for liquid, of a
full cycle hydraulic valve comprising a housing
55 having
a port for connection to the pump out
let, a port for connection to the tank and two
bores, an operating plunger reciprocably mounted
in one bore and having a portion extending
bore, a control plunger reciprocably mounted in 60 through one end thereof, a control plunger re
ciprocably mounted in the other bore. each
the other bore, means biasing said plunger to
plunger having lands'and grooves, each bore be
onev end of its bore, each plunger having lands.
ing closed at its ends and intersected by passages
Y and grooves, each bore being intersected by pas
and by ducts from said ports controllable and
sages and ducts from said ports controllable and
variously connectable by said grooves, a relief 65 variously connectable by said grooves upon move
ment of the plungers, a spring biased relief valve
valve always connected by one of said ducts with
always connected by one oi”: said duets with the
the pump port, means to bias said relief valve
pump port, means to conduct liquid discharged
shut and means to conduct liquid discharged from
from the relief valve when the pump pressure
the relief valve when the pump pressure becomes
excessive to said end of the second bore beyond 70 becomes excessive to one end of the second bore
to move the control plunger therein, said control
the control plunger to move the same against plunger being arranged to connect certain of said
said bias.
passages and ducts during said movement to re
2. The combination with a double acting by
duce the pump‘pressure below that necessary to
draulic press or the like having a piston capable
of limited movement in loading and unloading di» 75 actuate the relief valve whereby increment
a
~ 2,411,837
the control plunger is stopped, said operating
plunger being arranged to vent said end of the
second bore‘ to the tank when moved to the neutral
position and means to return ‘the control plunger
toward said end when it is so vented.
I
' 5. ;The combination with a double acting hy
draulic press or the like having a piston capable
of limited movement in loading and unloading di
' tral position whereby the control plunger moves
toward said end.
.
7. The combination with a double acting hy
draulic press or the like having a piston capable
of limited movement in loading and unloading
directions, a source of liquid under pressure and
a, reservoir for liquid, of a full ‘cycle hydraulic
valve comprising a housing having a port for
connection to the said source, a port, for con
rections, a source of liquid under pressure and
.- a reservoir for liquid, of a full cycle hydraulic 10
nection to the reservoir and two bores, an oper
- valve comprising a housing having a port for con
nection to the said source, a port for connection
to the reservoir and two bores, an ‘operating
plunger reciprocably mounted in one bore/ and
ating plunger reciprocably mounted in one bore
and manually movable from a neutral to an
operating position, a control plunger reciprocably
mounted
in the other bore and biased toward
. manually movable from a neutral to an operating 15
one end thereof,'each plunger having lands and
position, a control plunger reciprocably mounted
grooves, each bore being closed at its ends and
in the other bore and biased toward one end .
intersected
by passages and by ducts from said
thereof, each plunger having lands and grooves,
ports controllable and variously connectable by
, each bore being closed at its ends and intersected
' by passages and by ducts from said ports control 20 said grooves upon movement of the plungersya
relief valve always connected byone of said ducts
lable and variously connectable by said grooves
with the said source when the operating plunger
upon movement of the plungers, a relief valve
is in the operating position, means to bias said
always connected by'one of said duct with the '
relief valve shut, means to conduct ‘liquid
said source when the operating plunger is in the
operating position, means to bias said relief valve 25 through the valve to the press, means to conduct
shut, means to conduct liquid through the valve
liquid discharged from the relief valve when the
pressure becomes excessive for lack of movement
of the press piston to said end of the second
from the relief valve when the pressure becomes
bore to move the control plunger therein against
excessive, for lack of movement of the press pis-‘
ton, to said end of the second bore to move the 30 its bias,’ said control plunger being arranged to
connect by said movemenhcertain of ‘said pas
control plunger therein against its bias, said
sages and ducts to cause movement of the piston
control plunger being arranged to connect by
to reduce the liquid pressure below relief valve
said movement certain of said passages and ducts
operating pressure to stop' the movement of the
to cause movement ‘of the. piston to reduce the
liquid pressure below relief valve operating-- pres 35 .control plunger, said operating plunger being ar- ranged to vent said end oi’ the second bore to
sure to stop the movement of the control’ plunger,
the
reservoir when moved to neutral position
and means whereby the discharge of the relief
whereby
vthe control plunger moves toward said
valve is eil'ective to return the operating plunger
to neutral when the control plunger reaches a _ end, and said control plunger being arranged
when moved to the opposite'end of its bore to
predetermined position in its bore.
40 deliver pressure liquid to one end of the ‘operat
6. The combination with a double acting hy
ing plunger bore to move this plunger to neutral
draulic press or the like having a piston capable
of limited movement in loading and unloading.
.8. The combination with a double acting. hy
directions, a sourceof liquid under pressure and
draulic press or the like having a piston capable
a reservoir for liquid, 'of a full cycle hydraulic
to the press, means to conduct liquid discharged '
position.
1
"
,
-
.
'
valve comprising a housing having a port for , - .of limited movement in loading and‘unloading
directions, a source of liquid under pressure and
connection to the said source, a port for connec-‘
a reservoir for liquid, ‘of a full cycle hydraulic
tion to the reservoir and two bores, an operat- -
valve comprising a housing having ‘a
connection to the said source, a port
50 nection to the reservoir and two bores,
ating position, a control plunger reciprocably
ating plunger reciprocably mounted in
mounted in the other bore and biased toward one
ing plunger reciprocably mounted in one bore
and manually movable from a neutral to an oper
end thereof, each plunger having lands and
port for
for con-.
an oper
one bore
and manually movable from a neutral to an
operating position, a control plunger reciproca
grooves, each bore vbeing closed at its ends and
intersected by Passages and by ducts from said 55 bly mounted in the ‘other bore and biased toward ,
one end thereof, each plunger havin°g lands close
ports controllable and variously connectable by ‘
ly ?tting the bore‘ and grooves, each borebeing
said grooves upon movement of the plungers, a
closed at its ends and intersected by passages
relief valve always connected by one of said
and by ducts ‘from said ports controllable and
duets with the said source.when the operating
variously connectable by said grooves upon move
plunger
in the operating position, means to 60 ment of the plungers, a relief valve axially dis
bias said relief ‘valve shut, means to conduct
posed in said control plunger always connected
liquid through the valve to the press, means to ‘ by one of said ducts with the said source when
'conduct liquid discharged from the relief valve -
the operating plunger is in’ operating position,
when the pressure becomes excessive, for lack
means to conduct liquid‘through the valve to
, of movement of the press piston to said end of 65 and from the press,‘ means to conduct“ liquid
discharged from the relief valve when theppres
the second bore, to move the control plunger
sure becomes excessive, for lack ofimovement of
‘therein against its bias, said control plunger be
‘ the press piston, to said end of the second bore
ing arranged to connect by said movement cer
to move the control plunger therein a portion.
tain of said passages and ducts to cause move
ment of'the piston to reduce the liquid pressure 70 of its total movement from said end, said control
below relief valve operating pressure to stop the
plunger being constructed to connect by said
movement certain of said passages and ducts to
cause
movement of the press piston to reduce the
plunger being arranged to vent said endof the
liquid pressure below relief valve operating pres
second bore to the reservoir when moved to new 75 sure to stop movement of the ‘control plunger,
- movement of the controlplunger, said operating
2,411,ss7 7
l1
'
means to repeatedly operate said control plunger
by steps until it reaches its limit of movement
and means including certain of said passages to
then deliver liquid from the relief valve into one
end of the first bore to return the operating
plunger to its neutral position.
I
9. The combination with a. double acting hy
draulic press or the like having a piston capable
12
move the control plunger therein a portion of
its.total movement from said end, said control
plunger being constructed to connect by said
movement certain of said passages and ducts to
cause movement of the press piston to reduce the
liquid pressure below relief valve operating pres
‘sure to stop movement of the control plunger,
means to repeatedly operate said control plunger
by steps until it reaches its limit of movement,
directions, a source of liquid under‘pressure and 10 means including certain of said passages to then
deliver liquid from the relief valve into one end
a reservoir-for liquid, of a full cycle hydraulic
of the first bore to return the operating plunger
valve comprising a housing having a port for con
to its neutral position and a land on said oper
nectionto the said source, a portfor connection
ating plunger movable on said retum‘to neutral
to the reservoir and two bores, an operating
plunger reciprocably mounted in one bore and 15 position to uncover a passage between the said
end of said second bore and the reservoir whereby
manually movable from a neutral to an operat
of limited movement in loading and unloading
ing position, a control plunger reciprocably '
mounted in the other bore and biased toward one
the control plunger returns to neutral position,
said operating plunger having avalve to vent said
end of the first bore to the reservoina handle for
end thereof, each plunger having lands closely
?tting the bore and grooves, each bore being 20 moving said operating plunger from neutral to
operating position, pressure on said handle
closed at its ends and intersected by passages and
opening said last mentioned valve to permit
by ducts from said ports controllable and var
movement of the said operating plunger.
iously connectable by said grooves upon move
11. The combination with a double acting hy
ment of the plungers, a relief valve axially dis
press or the like having a piston capable
posed in said control plunger always connected 25 draulic
of limited movement in loading and unloading di
by one of said ducts with the said source when
rections, a source of liquid under pressure and a
the operating plunger is in operating position,
reservoir for liquid, of a full cycle hydraulic valve
means to conduct liquid through the valve to and
comprising a housing having a port for connec
from the press,,means to conduct liquid ‘dis
charged from the‘ relief valve when the pressure 30 tion to the said source, a port for connection to
the reservoir and two bores, an operating plunger
_ becomes excessive, for lack of movement of the
reciprocably mounted in one bore and manually
press piston, to said end of the second bore to
movable from a neutraltofan operating posi
move the control plunger therein a portion of its
tion, a control plunger reciprocably mounted in
total vmovement from said end, said control
the other bore and biased toward one end thereof,
plunger being constructed to connect by said
each plunger having lands and grooves, each
movement certain of said passages and ducts to
bore being closed at its ends and intersected by
, cause movement of the press piston to reduce the
passages and by ducts from said ports controlla
liquid pressure below relief valve operating pres
ble and variously connectable by said grooves
.sure to stop movement of the control plunger,
means to repeatedly operate said control plunger 40 upon movement of the plungers, a relief valve
connected by one of said ducts with the port con
by steps until it reaches its limit of movement,
nected to said source whenever the operating
means including certain of said passages to then
plunger is moved from the neutral, position,
deliver liquid from the relief valve into one end
means to bias said relief valve shut against pres
of the ?rst bore to return the operating plunger
sures less than the maximum required on the
45
to its neutral position and a land on said operat
work stroke of the press, means to conduct fluid
ing plunger movable on said return to neutral po
discharged from the relief valve to one end of
sition to uncover a passage betweenthe said end
the
second bore to move the control plunger
of said second bore and the reservoir whereby the
therein, said control plunger being arranged to
control plunger, returns to neutral position.
10. The combination with a double acting hy 50 connect certain of said passages and ducts during
successive movements to sequentially operate the
draulic press or the like having a piston capable of
press for a full cycle and thereby to reduce the
limited movement in loading and unloading di
rections, a source of liquid under pressure and a
reservoir for liquid, of a full cycle hydraulic valve’
comprising a housing having a port for connec
tion to the said source, a port for connection to
the reservoir and two bores, an operating
plunger reciprocably mounted in one bore and
pump pressure below that required to actuate the
relief valve each time the press plunger moves,
55 and means whereby final movement of the control
plunger delivers liquid to one end of the first bore
to return , the operating plunger to neutral
position.
1
"
12. The combination with a double acting hy- I '
manually movable from a neutral to an operat
ing position, I a- control plunger reciprocably 60 .draulic press or the like having a piston capable
of limited movement in loading and unloading
mounted in the other bore and biased toward
directions, a source of liquid under pressure and
one end thereof, each plunger having lands
a reservoir for liquid, of a'full cycle hydraulic
closely ?tting the boreland grooves, each bore ,
valve comprising a housing having a port for con
being closed at its ends and intersected by pas
nection
to the said source, a port for connection to
sages and by ducts from said ports controllable, 65
the reservoir and two bores, an operating plunger
and variously connectable by said grooves upon
reciprocably mounted in one bore and manually
movement of the plungers, a relief valve axially
movable from a neutral to an operating position,
disposed in said control plunger always connected
a control plunger reciprocably mounted in the
by one of said duets with the said source when
the operating plunger is in operating position, 70 other bore and biased toward one end thereof,
each plunger having lands and grooves, each bore
means to conduct liquid through the valve to and
being
closed at its ends and intersected by pas
from the press; means to conduct liquid dis
sages and by ducts from said ports controllable ,
charged from the relief valve when the pressure
and variously connectable by said grooves upon
becomes excessive, for lack of movement of the
movement of the plungers, a relief valve eon- _
press piston, to said end of the second bore to
'nected by one of said duets with the port con
nected to said source whenever the operating
' plunger is moved from the neutral position, means
to bias‘said relief valve shut against pressures .
less than the maximum required on the work
stroke of the press, means'to conduct ?uid dis
ciprocably mounted in one bore and having a
portion extending through one end thereof for
actuation of the same manually, a‘ control plunger
reciprocably mounted in the other bore, each '
plunger having lands and grooves, each bore be
ing closed at its ends and intersected by passages
and by ducts from said ports controllable and
variously connectable by said grooves upon move
ment of the plungers. a spring biased relief valve
said control plunger being arranged to connect
certain of said passages and ducts during suc 10 carried by said control plunger and always con
nected by one of said duets with the pump port,
cessive movements to sequentially operate the
charged from the relief valve to one end of the
second bore to move ‘the control plungertherein,
press for a full cycle and thereby to reduce the
means to conduct liquid discharged from the re
pump pressure below that required to actuate the
lief valve when the pump pressure becomes ex-"
relief valve each time the press plunger moves,
cessive to one end of the second bore to move the
er to vent the liquid, used to return it to neutral,
pressure below that necessary to actuate the re~
means whereby final movement of the control 15 control plunger therein, said control plunger be
ing arranged to connect ‘certain of said passages‘
plunger delivers liquid to one end of the ?rst bore
and ducts during .said movement to the press
to return the operating plunger to neutral posi
ports in such a manner as to reduce the pump
,. tion, and'valving‘means for said operating plung
during its normal movement to operating position.H 20 lief valve whereby movement of the control
plunger is stopped, said operating plunger being
13.‘ The combination with a double acting hy
arranged to vent said end of the second bore to
draulic press or the like having a piston capable‘
the tank when moved to the neutral position,
or limited movement in loading and unloading
and means to return the, control plunger toward
directions, a pump for delivering liquid under
pressure and a reservoir for liquid, of a full cycle 26 said end when it is so vented.
15. A ‘system for the automatic cycling of a"
hydraulic valve comprising a housing having a
double acting hydraulic press or the like I’ com
port for connection to the pump outlet, a port
prising in combination,v a cylinder, a piston
for connection to the reservoir and ‘two'bores,
an operating plunger reciprocably mounted in
mounted forilimited movement in the cylinder
‘one bore and manually movable‘from a neutral 30 in loading and unloading directions, a source of
liquid under ‘pressure, a ‘reservoir for liquid, a,
to an operating position, a control plunger re
cycling valve comprising a housing having a port
ciprocably mounted in the other bore and biased
connected to said source, a port connected to the
toward one end thereof, each plunger having
reservoir, a portlconnected to each end of the
lands and grooves, each bore being closed at its
ends and intersected by passages and by ducts 35 cylinderand two bores, an operating plunger re
ciprocably mounted in one bore and‘ manually '
from ‘said ports‘ controllable and variously con
movable from a. neutral to an operating position,
nectable by said grooves upon movement of the
a control plunger reclprocably mounted in the
plungers, a relief valve always connected by one
of said ducts with the said source when the oper- '
other bore and biased toward one ,end thereof, ‘
ating plunger is in the operating position, means
each plunger having lands closely. ?tting the bore
to vbias said relief valve shut. means to conduct
liquid through the valve to the press, means to
l conduct liquid discharged from the‘ relief valve
and grooves, each bore being closed at its ends
and intersected by passages ‘and, by ducts from
when the pressure becomes excessive, for lack of
movement of the press piston, to said end of the
second bore to move the control plunger therein‘
said ports all controllable and variously connect
. able by said grooves upon movement of the plung
ers, a relief valve axially disposed in said con
trol plunger always effectively connected by one
of said duets with the'said source only when the ,
operating plunger is in operating position, said
ranged to connect by said movement certain of '
passages, ducts and grooves comprising means to
' said passagesand‘ ducts to cause movement of
the piston to reduce the liquid pressure below 50 conduct liquid through the valve to and from the
press to operate the same, means to conduct liq- '
relief valve operating pressure to stop the move
‘ against its bias, said control ‘plunger'being'ar
ment of the control plunger, said operating plung
uid discharged from the relief valve when the
pressure becomes excessive, for lack of movement
' ofthe press piston, to said end‘oi’ the second bore
bore to the reservoir when moved to neutral po
sition whereby the control plunger moves toward 5.5 to move the control plunger therein a. predeter
mined portion of its total movement from said
said end. said operating plunger having one of its
er being arranged to vent said end of the second
grooves
ed and positioned to- connect the
end, said control plunger being constructed to
, pump port directly to the reservoir port when the . ' connect by said movement certain of said pass
sages and ducts to cause such movement of the
plunger is in neutral position.
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14. A system loathe automatic cycling of‘ a 60 press piston as to reduce the liquid pressure below
relief valve ‘operating pressure to temporarily stop a
‘double acting hydraulic press or the like compris
movement of the controlplunger, means to sim
‘ ing in combination, Va, cylinder, a piston capable ,
ilarlyirepeatedly operate said control plunger by .
of limited movement in the cylinder inloading
predetermined steps until it reaches ‘its limit of
and unloading directions, a pump for delivering
liquid under pressure, a tank for liquid. a Port 65 movement, and means including certain of ‘said
passages to then deliver’liquid from the relief,
for connection to each end of said press, a cycling
valve comprising a housing having a port con-‘ , valve into one end, of the first bore to‘ return the
operating plungerto its neutral position. ‘
nected tothe pump outlet, a port connected to
thetank-and two holes, an operating plunger re
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