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Патент USA US3093129

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June 11, 1963
N. H. SACHNIK
3,093,122
FLUID OPERATED PUMP
Filed Nov. 28, 1960
3 Sheets-Sheet 1
INVENTOR.
NORMAN H. SACHNIK
BY bowls» 1L4 M
ATTORNEY
June 11, 1963
N. H. SACHNIK
FIGIO
3,093,122
3,093,122
Patented June 11, 1963
2
3,093,122
FLUID OPERATED PUMP
Norman E. Sachnik, Houston, Tex., assignor to
Texsteam Corporation
Filed Nov. 28, 1960, Ser. No. 72,161
13 Claims. (Cl. 121-158)
This invention relates in general to a ?uid operated
ally consists of two pistons or two sides of the same piston
to cause the pump to be forced in one direction and then
in the other direction by reversing the pressures across
the piston. Invariably, this arrangement involves a cer
tain amount of clearance volume on both sides of the
piston.
Therefore, it is a further object of this invention to
provide a ?uid operated pump for use in glycol dehy
dration units which is self-regulating and functions to
pump, and more particularly to a pump useful in any
system wherein an absorbent or adsorbent ?uid is in 10 eliminate liquid level controllers and dump valve arrange
ments in order to provide a more economical construc
jected into a process vessel and circulatedback from the
process vessel whereby the energy of the circulated ?uid
may be utilized to drive the pump. Still more particu
larly, the pump of the present invention is adapted to
tion.
Another object of this invention resides in ‘the pro
vision of a ?uid operated pump having a single power
operate with glycol dehydration units for removing mois
chamber, wherein the clearance volume for the chamber
has been eifectively reduced to approximately one-half
ture from natural gas, although other uses and purposes
will be apparent to one skilled in the art of pumps.
The pump of the present invention is of the reciprocat
ing type wherein pressurized ?uid is employed for ~driv~
of that which would be used in a duplex power chamber,
thereby reducing the amount of power ?uid required to
cause the pump to reciprocate.
A still further object of this invention is to provide a
ing the pump and means is provided to automatically con 20
?uid operated pump which has only one power chamber
trol the driving pressurized ?uid delivered to a single
thereby simplifying the switching mechanism or slide
input port on the pump so as to effect reciprocal move
arrangements for operating the pump wherein only a two
ment of the ?uid pump piston. A master slide valve con
ported slide is necessary.
trols the distribution of the pressurized ?uid to a power
Other objects, features and advantages of the inven
piston that is connected to a piston rod also common 25
tion will be apparent from the following detailed dis
to the ?uid pump piston. A pilot slide valve operable
rocating action of the ?uid pow-er piston for pumping
closure, taken in conjunction with the accompanying sheets
of drawings, wherein like reference numerals refer to like
parts, in which:
FIG. 1 is a top plan view of the pump of the present
?uid.
Accordingly, it is an object of this invention to pro
clarity;
upon movement of the common piston rod controls op
eration of the master slide valve. Thus, a self-contained
valving arrangement automatically controls the recip
invention with some parts broken away for purposes of
FIG. 2 is a longitudinal sectional view taken through
vide an improved ?uid operated reciprocating pump for
the pump of FIG. 1 showing some parts in elevation and
pumping ?uid and the like.
Another object of this invention is in the provision of 35 other parts broken away for purposes of clarity;
a ?uid operated pump having a relatively few number
of parts and great simplicity thereby requiring a minimum
FIG. 3 is an enlarged detail sectional view taken sub
stantially along line 3-3 of FIG. 2;
FIG. 4 is an enlarged transverse sectional view, taken
amount of maintenance and attention.
substantially along line 4-4 of FIG. 2;
Still another object of this invention is in the provision
FIG. 5 is an enlarged transverse sectional view taken
of a ?uid operated reciprocating pump having a valving 40
arrangement automatically operable during reciprocating
substantially along line 5-5 of FIG. 2;
action of the pump.
PH. 6 is an enlarged detail sectional view taken sub
stantially along line 6-6 of FIG. 2; _
FIG. 7 is an enlarged detail sectional view taken sub
A further object of this invention is in the provision
of a ?uid operated pump especially useful in glycol de
hydration units, wherein lean glycol is pumped into an
absorber of a glycol dehydration unit and rich glycol
from the absorber is utilized to drive the pump.
stantially along line 7—7 of FIG. 2;
FIG. 8 is an enlarged transverse sectional view taken
substantially along line 8-8 of FIG. 2;
FIG. 9 is an enlarged top plan view of the pilot valve
plate; and
A still further object of this invention resides in the
provision of a glycol operated pump for pumping lean
FIG. 10 is a transverse sectional view of the master
glycol wherein the rich and lean glycol are completely
50 valve plate, taken substantially along line 10-10 of
isolated thereby preventing intermixing of same.
FIG. 1.
The pump of the present invention, operating in a
The pump of the present invention may be used in any
glycol dehydration unit, minimizes the amount of gas
system for pumping absorbent or adsorbent ?uid into a
consumed normally in driving a gas operated pump by
process vessel, wherein the ?uid is returned from the proc
substituting the high pressure ?uid as part of the power
ess vessel under higher pressure to drive the pump, al
media. Normally, in such a glycol dehydration unit,
though the pump of the present invention will be described
where the high pressure liquid is dumped from the high
in association with a, glycol dehydration unit. Accord
pressure to the low pressure vessel, conventional auto
ingly, in general, the pump is intended to inject lean gly~
matic liquid level controllers and dump valve arrange
col into a glycol absorber of a glycol dehydration unit.
ments are needed. Since the pump of the present in
vention utilizes the ‘high pressure ?uid as a powering 60 The power required to ‘operate the pump is received in the
form of high pressure, rich glycol from the absorber, which
agent, it is in some respects self-regulating in doing
contains absorbed water and hydrocarbon vapors. A cer
Work with the high pressure ?uid as it is discharged from
the vessel instead of merely throttling the liquid across
tain amount of high pressure gas from the absorber is also
a dump valve. This permits overall more economical
entrained in the rich glycol which is used to drive the
construction cost of a dehydration unit because of the 65 pump.
eliminating of the liquid level controller and the dump
Referring now to the drawings, the pump body includes
valve. Another feature of the invention is in that the
generally a power cylinder it}, a ?uid end adapter 11 at
pump is reciprocatory and that only one power chamber
one end of the power cylinder, a valve end adapter 12 at
is pressurized and exhausted to cause such reciprocation.
the other end of the power cylinder, a ?uid cylinder 13
And although only a single power chamber is provided 70 extending from the end of the ?uid end adapter 11 remote
with other pumps of this type, the powering chamber usu
from the power cylinder, a suction head 14 covering the
3,093,122
3
end of the ?uid cylinder remote from the ?uid end adapter
11, a pilot valve body 15 extending from the end of the
valve end adapter 12 remote from the power cylinder, and
a master valve body 16 secured to the pilot valve body 15.
The end of the pilot valve body 15 adjacent the valve
4
end adapter 12 and the suction head 14 are provided with
?anges for receiving tie rods that serve to hold in tightly
rod 20. A chamber 48 is de?ned in the ?uid cylinder with
the ?uid piston 43 and the ?uid end adapter 11.
The suction head 14 closes the other end of the ?uid
cylinder 13 and de?nes at the other side of the piston 43
a chamber 49. Fluid leakage between the ?uid cylinder
13 and the suction head is prevented by an O-ring 50.
A laterally extending bore 51 is provided in the suction
assembled position the power cylinder 19, ?uid end
head 14 and communicates at its inner end with the cham
adapter 11, valve end adapter 12, ?uid cylinder 13, suction
ber 49 in the ?uid cylinder. The bore 51 is threaded at
head 14 and pilot valve body 15. The master valve body 10 its lower end and threadedly receives a suction bushing
16 is independently secured to the pilot valve body 15.
52. A poppet check valve 53 is guidably carried in the
The power cylinder This provided with a bore 17 which
bushing and provided with an O-ring 54 that coacts with
slida‘bly receives a power piston 18 which is annular in
an inclined annular seat on the upper end of the bushing
shape and provided with a center bore 19 receiving a
to de?ne a liquid seal between the poppet check valve and
common piston rod 29 which extends through and into 15 the bushing. An inlet bore 55 extends through the bush
the power cylinder 10, the ?uid end adapter 11, the valve
ing 52 which is adapted to be connected to a supply of
end adapter 12, the ?uid cylinder 13, and the pilot valve
lean glycol. The lower end of the poppet valve 53 is
body 15. A pair of power piston rings 18a are carried
tubular and provided with a plurality of openings 56,
on the power piston 18 for sealing engagement with the
FIGS. 2 and 3, which permit ?ow of glycol between the
bore 17 of the power cylinder. Similarly, an O-ring 23 20 inlet bore 55 and the chamber 49‘ when the poppet valve
is provided between the power piston 13 and the piston
is raised from its seat. When ?uid in chamber 49 is
rod 20 to prevent leakage of ?uid along the piston rod
pressurized by movement of the piston rod 20 towards
and the piston. The power piston 18 is held in position
the left, the poppet valve closes to prevent backward ?ow
along the piston rod 20 by means of a piston retainer ring
of ?uid through the inlet bore 55. Thus, the poppet valve
24 locking the power piston against movement toward
only permits ?uid ?ow in one direction, that is, into the
the left as viewed in the drawings, and an elongated sleeve
chamber 49 of the ?uid cylinder. By action of the ?uid
25 received over the piston rod and abutting against the
piston 43 in the ?uid cylinder toward the right as seen
other side of the power piston. A bushing 26 is screw
in the drawing, a supply of lean glycol is sucked into the
threaded into the outer open end of a blind bore 27 formed
chamber 49. A bleed valve 58 is provided to properly
in the right hand end of the piston rod 29, and de?nes a 30 condition the pumping chamber 49.
?ange for receiving a sleeve retainer ring 28 to lock the
Upon stroking of the piston rod and piston 43 toward
sleeve 25 in position along the piston rod 20 and thereby
the left, during which time the poppet valve 53 is seated
lock the power piston 18 on the piston rod. An O-ring
and prevents pumping of the lean glycol out of the inlet
Z9 is provided between the outer surface of the piston
55 and the chamber 49, the lean glycol is forced into the
rod and the inner surface of the sleeve 25 to prevent leak
chamber 48. Transfer of the lean glycol from the cham
age of ?uid along the surfaces between the sleeve and
ber 49 into the chamber 48 is provided by means of a
piston rod.
passageway 59 in the bushing 45 which communicates
The power cylinder 10 is closed at one end by the ?uid
with a necked-down portion 46a of the bore 46 that, in
end adapter 11 thereby de?ning a chamber 30 at one side
turn, communicates with a transverse passageway 60 ex
of the power piston 18. An O-ring 31 is arranged be
tending entirely through the piston rod 20. From the
tween the fluid end adapter 11 and the power cylinder
chamber 48, lean glycol is pumped through an outlet 61
1%) to prevent leakage of ?uid therebetween. An annular
in the ?uid end adapted 11 to an absorber of a dehydra
recess is provided within the ?uid end ‘adapter 11 for re
tion unit. The outlet 61 is in communication with the
ceiving packing 32 which sealingly surrounds the piston
chamber 48, and to prevent passage of the ?uid in the
rod 20. A packing retainer bushing 33 holds the packing
chamber 48 back to the chamber 49 during stroking of
32 in position and is, in turn, maintained in position in
the ?uid piston toward the right, a ball check valve 63 is
the ?uid end adapter by abutting against one end of the
provided at the inner end of the bushing 45 to seat against
?uid cylinder 13 which extends from the ?uid end adapter
a surface 64 at the inner end of the passageway 59.
away from the power cylinder 10. Thus, ?uid leakage
A coil spring 65 resiliently biases the ball check valve 63
along the piston rod and the ?uid end adapter is sealed
against the seating surface 64.
off by the packing 32. An inlet port 35 is provided in
The pilot valve body 15 is provided with a blind bore
the ?uid end adapter and communicates with the power
de?ning a chamber 66 adapted to receive the piston rod
chamber 30.
20, and a slide valve chamber 67 spaced therefrom and
The other end of the power cylinder 10 is closed by
intercommunicating with the chamber 66 by a passage
the valve end adapter 12 which is annularly internally
way 68. The chamber 67 communicates thereabove with
recessed to receive a power end packing 37 for effecting a
an opening 69 extending upwardly and through the upper
?uid seal against the sleeve 25 on the piston rod 20. The
side of the valve body 15. The valve body opening 69
pilot valve body 15 holds the packing 37 in position in
receives a pilot valve plate 70 having spaced ports 71 and
a recess of the valve end adapter 12 and is sealed against
72 coacting with a pilot slide valve 73 for controlling
?uid leakage therewith by an O-ring 38. An O-ring 39 60 movement of ?uid into the master valve body.
seals against ?uid leakage between the valve end adapter
An elongated pilot valve rod is generally designated
12 and the power cylinder 10. Thus, the valve end
by the numeral 74 and includes an elongated section 75
adapter 12 coacts to de?ne a chamber 40‘ at the other
received in the chamber 66 and freely received in a bore
side of the power piston 18.
76 provided in the bushing 26, an enlarged bearingly sup
Fluid leakage ‘between the ?uid end adapter 11 and
ported portion 77 slidably received in a bearing 78, and
the ?uid cylinder 13 is prevented by an O-ring 41. The
an end section 79 receiving the part of the slide valve 73.
?uid cylinder 13 is provided with a bore 42 which slidably
An enlarged head 80 is carried on the end of the section
receives a ?uid piston 43 suitably secured to the end of
75 remote from the end of the rod carrying the pilot slide
the piston rod 20‘. Piston rings 44» are received on the
valve to coact with the piston rod 20 and effect a lost
outer circumference of the ?uid piston 43 for sealing en
motion connection therebetween for controlling operation
gagement with the bore 42 of the ?uid cylinder. The
of the pilot slide. An inlet port 81 is provided in the
?uid piston 43 is secured to the end of the piston rod by a
retaining bushing 45 screw threaded into a bore 46 formed
in the end of the piston rod. An O-ring 47 precludes
?uid leakage between the ?uid piston 43 and the piston
pilot valve body and connects to a conduit 81a which
receives rich glycol under pressure from the absorber of
the dehydration unit. Thus, the inlet port 81 receives
the power supply for driving the pump. Action of the
3,093,122
5
pilot valve rod 74 is such that upon stroking of the piston
rod 20 toward the right, the shoulder 80a of the enlarge
ment 80 is engaged by the bottom wall 83 of the blind
bore 27 to move the valve rod toward the right and align
the closed pocket 73a of the slide valve so as to inter
communicate ports 71 and 72 and isolate the chamber
8
haust chamber 101 through the exhaust port 71. An
O-ring 106 ?uid seals the exhaust port 71 of the pilot
valve plate 70‘ with the exhaust port 103 in the master
valve \body 16, while an O-ring 107 ?uid seals the port 71
in the pilot valve plate with the inlet port 102 in the master
valve body.
The chamber 85 in the master valve body 16 inter
67 from either of the ports. Upon stroking of the piston
communicates with the chamber 66 in the pilot valve
rod 20 toward the left, the inner end 26a of the bushing
body by means of the port 108 in the master valve body
26 strikes the other end 80b of the enlargement 80 and
carries the valve rod 74 to the left to the position ap 10 aligning with a port 109 in the pilot valve body. An
O-ring 110 prevents ?uid leakage between the master
proximately shown in the drawing wherein the port 72
valve body and the pilot valve body around the ports 108
is intercommunicated with the chamber 67 and the port
and 1019. An outlet port 111 in the master valve plate 86
71 is isolated with respect to the chamber 67 by virtue of
in-tercommunicates with the chamber 85 and leads to one
the pilot slide valve 73.
Fluid leakage between the pilot valve plate 70 and the 15 side of a ‘speed control valve '34 threadedly mounted in a
bore in the master valve body. A conduit or line 112
pilot valve body 15 is prevented by an O-ring seal 82
connects the other side of the master control valve to
arranged therebetween. The pilot valve plate 70 is locked
the inlet port 35 of the power chamber 30 in the power
into position by the overlapping of the master valve body
cylinder. The speed control valve 34 is provided for
16 which is arranged over the pilot valve body 15 and
controlling
the speed of the pump by controlling the ?ow
suitably secured thereto.
20
of ?uid into and out of the power chamber 30. The
pocket 84a of the master slide valve 84 is in constant com
munication with an exhaust port 114 formed in the master
valve plate 86. In the position shown in FIG. 2, the
73. A chamber 85 is formed in the master valve body
16 and opens to the upper side thereof and is closed by a 25 master slide valve isolates exhaust port 114 from the
chamber 85 and the port 111. Upon movement of the
master valve plate 86. The master slide valve 84 is
master slide valve 84 toward the right, the ports 1-11 and
mounted on one end of a master Valve rod 87 slidably re
114 are interconnected and the chamber 85 is isolated
ceived in a bore 88 formed in the master valve body. A
from the port 111. An O-ring '115 is arranged between
pin 84b serves to properly secure the slide valve 84 to
the rod 87.
30 the master valve body and the master valve plate in order
to prevent fluid leakage :therebetween.
_
The master valve body includes a bore 90 at the right
While the chamber 30 of the power cylinder intercon
hand end which receives a piston sleeve 91. A master
valve piston 92 is slidably received in the piston sleeve
nects with the power line 112, it may be noted that the
chamber 40 on the other side of the power piston 18 in
91 and suitably connected to the master valve rod 87.
Master valve rod packing 93 is sealingly arranged about
tercommunicates with an exhaust port 116 that connects
the master valve rod 87 and held in position by a packing
to an exhaust conduit v117 that, in turn, is connected to a
retainer ring 94. The left end of the piston sleeve 91'
T-?tting 1-13 mounted in the master valve body 16 and
abuts against the remainer ring 94 and is held in place by
at one end of a transversely extending bore, FIG. 10. An
a master valve cap 95 which is threadedly received in the
exhaust line 22 is connected to the other end of the bore.
end of the bore 90. A suitable O-ring may be provided 40 A conduit or line 1118 connects the exhaust outlet 104 with
to‘seal the master valve cap to the master valve body.
the ‘ff-?tting 1-13 and ultimately to the exhaust line 22.
The opposite ends of the piston sleeve 91 are circum
-In operation, with the parts shown as in the drawing,
ferentially perforated or provided with openings 96 and
rich glycol under pressure is ‘admitted through the line
97 in alignment with annular grooves 98 and 99 provided
81a to the inlet port 81 and into the chambers 66 and
in the bore 90 of the master valve body. An O-ring 90a
.67, whereupon it is delivered through ports .1019 and 108
is provided between the piston sleeve 91 and the bore 90
to the chamber 85 of the master valve body and through
in order to prevent ?uid leakage therealong and between
the speed control valve 34 and the power conduit 112 to
the annular grooves 98 and 99. Suitable packing may be
the chamber 30 of the power cylinder for driving the
provided on the piston 92 to provide a sealing relation
power piston 18 and the piston rod toward the right as
ship between the piston and the sleeve 91. A power 50 viewed in the drawing. At the same time, the high pres
chamber 100 is de?ned between the right hand side of the
sure rich glycol is in communication with the chamber
piston 92 and the master valve cap 95, while an exhaust
100 of the master valve cylinder through chamber 67,
chamber 101 is de?ned between the other side of the
ports 72 and 102 and openings 97 and holds the master
piston 92 and the packing retainer ring 94. The power
slide valve in position as shown in FIG. 2 because the
chamber 100 is in communication with an inlet port 55 unbalance of area vagainst the piston 92 is greater than
102 formed in the master valve body, while the exhaust
the area of the end of the piston rod 8-7 and designated
chamber 101 is in communication with an exhaust port’
by the numeral 87a in the chamber 85. It wil be appre
103 formed in the master valve body and an exhaust out
ciated that clearance exists between the end 87a and the
let 104. The inlet port 102 is in alignment with an en
adjacent end of the valve body. As the piston rod is
larged opening formed in the upper face of the pilot
driven toward the right, lean glycol is drawn into the inlet
valve plate 70 and which is in communication with the
port 55 and into the chamber 49, while the lean glycol in
The master valve body includes a master slide valve 84
which controls the operation of the power piston 18 and
is, in turn, controlled by action of the pilot slide valve
port 72 of the pilot valve, while the exhaust port 103 is
the chamber 48 is pumped out through the discharge port
in communication with an enlarged opening formed in
61 and to the absorber. When the bottom 83 of the blind
the upper face of the pilot valve plate which is in com
bore 27 in the piston rod 20 strikes the free end 80a of
munication with the port 71 therein. It may be noted 65 the enlargement 80 on the end of the pilot valve rod 74,
that the port 71 is at all times in communication with the
continued movement of the piston rod toward the right
exhaust outlet 104. A pin 105 is provided to lock the
will move the pilot slide valve 73‘ to the right to inter
pilot valve plate 70 to the pilot valve body. It may be
comrnunicate ports 71 and 72 thereby intercomrnunicating
noted that the port 72 in the pilot valve plate leads to
the power chamber 100 in the master valve body. ' ‘Fur
ther, the port 72 selectively interconnects the chamber 67
in the pilot valve body with the power chamber 100
the chamber 100‘ with the exhaust line 22, at which time
70 the high pressure rich glycol in the chamber 85 will act
against the end 87a of the piston rod 87 to drive the piston
rod and master slide valve 84 to the right so as to inter
when the pilot valve 73 is positioned as shown in FIG. 2.
communicate the exhaust port 114 and port 111 in the
When the pilot slide valve moves to the right, the
master valve plate and shut off the supply of high pressure
power chamber 100 is intercommunicated with the ex 75 rich ‘glycol to the chamber 30 and the power cylinden.
3,093,122‘
7
8
Thus, movement of the master slide valve to the right to
the point that it intercommunicates ports 111 and 114
e?ectively intercommunicates the chamber 30 of the
power cylinder with the exhaust line 22.
The high pressure rich glycol always present in the
lost motion connection between said piston rod and pilot
slide valve to actuate said pilot slide valve concurrently
with the reciprocation of said piston rod.
chamber 66 will then act against the end of the piston rod
20 in the chamber 66 and drive the piston rod 20‘ toward
said motor comprising a piston rod having a power piston
a pilot slide valve controlling said ?uid operated means
for selectively actuating said master slide valve, and a
3. A ?uid operated motor adapted to drive a pump,
the left thereby causing the glycol in the chamber 30 to
thereon, a high pressure ?uid chamber having one end
of the piston rod received therein, means for supplying
be exhausted into the exhaust line 22, and further cause
closure of the poppet check valve 53 and opening of the 10 high pressure ?uid to said chamber whereby the end
of the piston rod therein is continually subjected to the
ball valve 63 to transmit the ?uid in chamber 49 into
pressure of said ?uid, a master slide valve for selectively
chamber 48, and thereby forcing a volume of ?uid, out
interconnecting said chamber to the side of said power
through the outlet port 61. This volume of ?uid dis
piston opposite from said one end of said piston rod,
charged as the piston rod ‘20 moves from right to left is
equal to the displacement 'of the piston rod 20. At the 15 ?uid operated means for driving said master slide valve,
a pilot slide valve controlling said ?uid operated means
end of the stroke, the inner end 26:: of the bushing 26
for selectively actuating said master slide valve, and a
will engage the inner end 80b of the enlargement 80 on
lost motion connection between said piston rod and pilot
the end of the pilot valve rod 74 to drive the pilot slide
slide valve to actuate said pilot slide valve at the opposite
valve 73 to the left and once again open the port 72
to the chamber 67 and thereby intercommunicate cham 20 ends of the reciprocal stroke of said piston rod.
4. A ?uid operated motor adapted to drive a pump,
ber 67 with the chamber 100‘. With the rich, high pres
said motor comprising a power cylinder and a high pres
sure glycol then being delivered to the ‘chamber 100, and
sure ?uid chamber, a piston rod extending into said
because of the larger area on the slide valve piston than
power cylinder and having an end terminating in said
the end 87a of the rod 87, the slide valve piston rod 87
?uid chamber, a piston on said rod and reciprocal in
will be driven toward the left to again intercommuni
said power cylinder, means for supplying high pressure
cate the port v111 with the chamber 85 and once again
?uid to said ?uid chamber whereby said piston rod end
deliver rich, high pressure glycol to the chamber 30 of
is continually subjected to the pressure of the ?uid, ?rst
the ‘power cylinder for repeating the cycle of operation
valve means for selectively interconnecting said ?uid
and driving the power piston 18 and piston rod 20 to
chamber and the side of the power piston in said power
ward the right again. The cycle of operation then re
peats itself.
cylinder to drive the piston rod into said ?uid chamber,
?uid operated means for driving said master slide valve,
In driving the power piston 18 to the right as seen in
second valve means controlling said ?uid operated means
FIG. 2, it should be appreciated that the pressure-area
for selectively actuating said ?rst valve means, and means
component against the power piston 18 must be greater
interconnecting said piston rod and said second valve
than the pressure-area component against the end of the
means to actuate said second valve means concurrently
piston rod 20 in the chamber 66' plus the pressure-area,
with the reciprocation of said piston rod.
component against the ?uid piston 43 in the chamber 48.
5. A ?uid operated motor adapted to drive a pump,
Likewise, when the pump is conditioned by the valves
to move toward the left in FIG. 2, the pressure-area
said motor comprising a power cylinder and a high pres
component against the piston rod 20 in chamber 66 must 40 sure ?uid chamber, a piston rod extending into said
power cylinder and having an end terminating in said
be greater than the pressure-area component against the
?uid chamber, a piston on said rod and reciprocal in
end of the ?uid piston 43 in the chamber 49 plus the
said power cylinder, the pressure area of said power
now exhaust pressure-area component against the power
cylinder being greater than the pressure area on the end
piston in the chamber 30.
of said piston rod in said ?uid chamber, means for sup
It will be understood that modi?cations and variations
plying high pressure ?uid to said ?uid chamber whereby
may be eifected without departing from the scope of the
said piston rod end is continually subjected to the pres
novel concepts of the present invention, but it is under
sure of the ?uid, ?rst valve means for selectively inter
stood that this application is to be limited only by the
connecting said ?uid chamber and the side of the power
scope of the appended claims.
piston in said power cylinder to drive the piston rod
The invention is hereby claimed as follows:
into said ?uid chamber, ?uid operated means for driving
1. A ?uid operated motor adapted to drive a pump,
said master slide valve, second valve means controlling
said motor comprising a piston rod having a power piston ,
said ?uid operated means for selectively actuating said
thereon, a high pressure ?uid chamber having one end
?rst valve means, and means interconnecting said piston
of the piston rod received therein, means for supplying
rod and said second valve means to actuate said second
high pressure ?uid to said chamber whereby the end of
valve means concurrently with the reciprocation of said
the piston rod therein is continually subjected to the,
piston rod.
pressure of said ?uid, a master slide valve for selectively
6. A ?uid operated motor adapted to drive a pump,
interconnecting said chamber to the side of said power,
said motor comprising a power cylinder and a high pres
piston opposite from said one end of said piston rod, ?uid
operated means for driving said master slide valve, a 60 sure ?uid chamber, a piston rod extending into said
power cylinder and having an end terminating in said
pilot slide valve controlling said ?uid operated means
?uid chamber, a piston on said rod and reciprocal in
for selectively actuating said master slide valve, and
said power cylinder, means for supplying high pressure
means interconnecting said piston rod and. pilot slide
?uid to said ?uid chamber whereby said piston rod end
valve to actuate said pilot slide valve concurrently with
the reciprocation of said piston rod.
2. A ?uid operated motor adapted to drive a pump,
said motor comprising a piston rod having a power piston
thereon, a high pressure ?uid chamber having one end
is continually subjected to the pressure of the ?uid, ?rst
valve means for selectively interconnecting said ?uid
chamber and the side of the power piston in said power
cylinder to drive the piston rod into said ?uid chamber,
second valve means for selectively actuating said ?rst
valve means, means interconnecting said piston rod and
of the piston rod received therein, means for supplying
high pressure ?uid to said chamber whereby the end of 70
said second valve means to actuate said second valve
the piston rod therein is continually subjected to the
means concurrently with the reciprocation of said piston
pressure of said ?uid, a master slide valve for selectively
rod, and control valve means between said ?uid chamber
interconnecting said chamber to the side of said power
and said power cylinder to control the ?uid ?ow there
piston opposite from said one end of said piston rod,
between thereby controlling the speed of said motor.
?uid operated means for driving said master slide valve, 75
7. A ?uid operated motor adapted to drive a pump,
3,093,122
10
selectively actuating said master slide valve, a lost motion
connection between said piston rod and pilot slide valve
to actuate said pilot slide valve concurrently with the
cylinder and having an end terminating in said ?uid
reciprocation of said piston rod, and control valve means
chamber, a piston on said rod and reciprocal in said
between said ?uid chamber and said power cylinder to
power cylinder, the pressure area of said power cylinder
control the ?uid ?ow therebetween thereby controlling
being greater than the pressure area on the end of said
the speed of said motor.
piston rod in said ?uid chamber, means for supplying
11. A ?uid ope-rated motor adapted to drive a pump,
high pressure ?uid to said ?uid chamber whereby said
said motor comprising a power cylinder, a high pressure
piston rod end is continually subjected to the pressure of
?uid supply chamber having an inlet thereto, a master
the ?uid, ?rst valve means for selectively interconnect
valve and a pilot valve, said power cylinder having a
ing said ?uid chamber and the side of the power piston
power piston reciprocable therein, an inlet port, and an
in said power cylinder to drive the piston rod into said
exhaust port, said master valve having a master valve
?uid chamber, ?uid operated means for driving said
chamber, means intercommunicating said supply cham
master slide valve, second valve means controlling said
?uid operated means for selectively actuating said ?rst 15 her and said master valve chamber, a ?rst port connected
to an exhaust line, a second port connected to the inlet
valve means, and lost motion connecting means inter
port of said power cylinder, a master slide valve in said
connecting said piston rod and said second valve means
master valve chamber for selectively isolating said ?rst
to actuate said second valve means at the extreme ends
port and intercornrnunicating said second port to said
of the reciprocal stroke of said piston rod.
master valve chamber or interconnecting said ?rst and
8. A ?uid operated motor adapted to drive a pump,
second ports, a master ‘valve rod reciprocably mounted
said motor comprising a power cylinder and a high pres
in said master valve chamber and carrying said master
sure ?uid chamber, a piston rod extending into said
slide valve, a master valve cylinder adjacent said master
power cylinder and having an end terminating in said
valve chamber having a master valve piston reciprocable
?uid chamber, a piston on said rod and reciprocal in
said power cylinder, the pressure area of said power 25 therein engage-able with one end of said master valve rod
to drive said rod and master slide valve to the position
cylinder being greater than the pressure area on the end
whereby said ?rst port is isolated, said master valve cyl
of said piston rod in said ?uid chamber, means for sup
said motor comprising a power cylinder and a high pres
sure ?uid chamber, a piston rod extending into said power
plying high pressure ?uid to said ?uid chamber whereby
said piston rod end is continually subjected to the pres
sure of the ?uid, a reciprocating master slide valve for
selectively interconnecting said ?uid chamber and the
side of the piston in the power cylinder remote from
inder having an exhaust port on one side of the master
vmve piston and an inlet port on the other side thereof,
said pilot valve including a pilot valve chamber, means
intercommunicating said pilot valve chamber and said
supply chamber, a ?rst pilot valve port interconnected to
the exhaust side of said master valve piston, a second
pilot valve port interconnected to the inlet side of said
from said piston rod end, a reciprocating pilot slide valve 35 master valve piston, a pilot slide valve in- said pilot valve
said piston rod end or interconnecting an exhaust line
and the side of the piston in the power cylinder remote
for selectively actuating said master slide valve, and a
lost motion connection between said piston rod and pilot
slide valve to actuate said pilot slide valve concurrently
with the reciprocation of said piston rod.
chamber for selectively isolating said ?rst pilot valve port
power cylinder and having an end terminating in said
?uid chamber, a piston on said rod and reciprocal in said
power cylinder, the pressure area of said power cylinder
and intercommunicating said second pilot valve port to
said pilot valve chamber or interconnecting said ?rst and
second pilot valve ports, a pilot valve rod reciprocably
mounted in said pilot valve chamber, a connecting rod
carried by said power piston, one end of said connecting
rod extending into said supply chamber, and a lost motion
connection between said pilot valve rod and said con
necting rod for reciprocating the pilot valve rod at the
ends of the reciprocal stroke of said connecting rod.
being greater than the pressure area on the end of said
12. A fluid operated motor adapted to drive a pump,
‘9. A ?uid operated motor adapted to drive a pump,
said motor comprising a power cylinder and a high pres
sure ?uid chamber, a piston rod extending into said
said motor comprising a power cylinder, a
pressure
piston rod in said ?uid chamber, means for supplying
?uid supply chamber having an inlet thereto, a master
high pressure ?uid to said ?uid chamber whereby said
valve and a pilot valve, said power cylinder having a
piston rod end is continually subjected to the pressure of
the ?uid, a twin-ported reciprocating master slide valve 50 power piston reciprocable therein, an inlet port, and an
exhaust port, said master valve having a master valve
for selectively interconnecting said ?uid chamber and the
chamber, means intercommunicating said supply cham
side of the piston in the power cylinder remote from
her and said master valve chamber, a ?rst port connected
to an exhaust line, a second port connected to the inlet
vfrom said piston rod end, a twin-ported reciprocating pilot 55 port of said power cylinder, a master slide valve in said
said piston rod end or interconnecting an exhaust line
and the side of the piston in the power cylinder remote
slide valve for selectively actuating said master slide valve,
and a lost motion connection between said piston rod and
pilot slide valve to actuate said pilot slide valve concur
rently with the reciprocation of said piston rod.
master valve chamber for selectively isolating said ?rst
port and intercomrnunicating said second port to said
master valve chamber or interconnecting said ?rst and
second ports, a master valve rod reciprocably mounted
10. A ?uid operated motor adapted to drive a pum , 60 in said master valve chamber and carrying said master
slide valve, a master valve cylinder adjacent said master
said motor comprising a power cylinder and a high pres
valve chamber having a master valve piston reciprocable
sure ?uid chamber, a piston rod extending into said power
therein engageable with one end of said master valve rod
cylinder and having an end terminating in said ?uid
to drive said rod ‘and master slide valve to the position
chamber, a piston on said rod and reciprocal in said power
cylinder, the pressure area of said power cylinder being 65 whereby said ?rst port is isolated, said master valve cyl
‘greater than the pressure ‘area on the end of said piston
inder having an exhaust port on one side of the master
valve piston and ‘an inlet port on the other side thereof,
rod in said ?uid chamber, means for supplying high pres
said pilot valve including a pilot valve chamber, means
sure ?uid to said ?uid ‘chamber whereby said piston rod
intercommunicating said pilot valve chamber and said
end is continually subjected to the pressure of the ?uid, a
twin-ported reciprocating master slide valve ‘for selec 70 supply chamber, a ?rst pilot valve port interconnected to
the exhaust side of said master valve piston, a second
tively interconnecting said ?uid chamber and the side of
pilot valve port interconnected to the inlet port side of
the piston in the power cylinder remote from said piston
said master valve piston, a pilot slide valve in said pilot
rod end ‘or interconnecting an exhaust line and the side of
valve chamber for selectively isolating said ?rst pilot valve
the piston in the power cylinder remote from said piston
rod end, a twin-ported reciprocating pilot slide valve for 75 port and intercommunicating said second pilot valve port
3,093,122
12
to said pilot valve chamber or interconnecting said ?rst
chamber and said supply chamber, a ?rst pilot valve port“
and second pilot valve ports, a pilot valve rod reciprocably
interconnected to the exhaust side of said master valve
mounted in said pilot valve chamber, a connecting rod
piston, a second pilot valve port interconnected to the
carried by said power piston, one end of said connecting
inlet port side of said master valve piston, a‘pilot slide
rod extending into said supply chamber, and a lost motion 5 valve in said pilot valve chamber for selectively isolat-r
connection between said pilot valve rod and said con
ing said ?rst pilot valve port and intercommunicating
necting rod for reciprocating the pilot valve rod at the
said second pilot valve port to said pilot valve chamber
ends of the reciprocal stroke of said connecting rod, the
or interconnecting said ?rst and second pilot valve ports,
pressure area of said power piston being greater than
a pilot valve rod reciprocably mounted in said pilot valve
the pressure area of said connecting rod end in said
chamber, a connecting rod carried by said power piston,
supply chamber.
one end of said connecting rod extending into said supply
13. A ?uid operated motor adapted to drive a pump,
chamber, and a lost motion connection between said
said motor comprising a power cylinder, a high pressure
pilot valve rod and said connecting rod for reciprocating
?uid supply chamber having an inlet thereto, a master
the pilot valve rod at the ends of the reciprocal stroke
valve and a pilot valve, said power cylinder having a
of said connecting rod, the pressure area of said power
power piston reciprocable therein, an inlet port, and an
piston being greater than the pressure area of said con
exhaust port, said master valve having a master valve
necting rod end in said supply chamber and the pressure
chamber, means intercommunicating said supply cham
area of the outlet side of said piston.
ber and said master valve chamber, a ?rst port con
nected to an exhaust line, a second port connected to
the inlet port of said power cylinder, a master slide
valve in said master valve chamber for selectively isolat
ing said ?rst port and intercommunicating said second
port to said master valve chamber or interconnecting
said ?rst and second ports, a master valve rod recipro
cably mounted in said master valve chamber and carrying
said master slide valve, a master valve cylinder adjacent
said master valve chamber having a master valve piston
reciprocable therein engageable with one end of said
master valve rod to drive said rod and master slide valve 30
to the position whereby said ?rst port is isolated, said
master valve cylinder having an exhaust port on one
side of the master valve piston and an inlet port on the
other side thereof, said pilot valve including a pilot valve
chamber, means intercommunicating said pilot valve
References Cited in the ?le of this patent
UNITED STATES PATENTS
825,950
2,087,713
2,215,852
2,490,000
Weir ________________ __ July
Whiteside et a1 ________ __ July
Klein _______________ __ Sept.
Cooper _____________ __ Nov.
17,
20,
24,
29,
1906
1937
1940
1949
2,538,842
2,631,572
2,637,304
2,707,456
2,751,889
2,989,077
McFarland __________ __ Jan. 23,
Dempsey ___________ __ Mar. 17,
Dinkelkomp __________ _._ May 5,
Schweisthal ___________ __ May 3,
Mohler _____________ __ June 26,
Lee ________________ __ June 20,
1951
1953
1953
1955
1956
1961
FOREIGN PATENTS
5,243
Great Britain ________________ __ 190]
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