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Dec. 3, 1946.
Filed April 3, 1943
_ 3 Sheets-Sheet 1
: Inventor;
“ Attorney’. ,
Dec. 3, 1946.
Filed April 3, 194:5
3 Sheets-Sheet 2
Q’ t' / ‘w 1
7 '_ f
Attorney. ' l
Dec. 3, 1946.
1 ~
' 2,412,105
Filed April 3, L943
3 She-ets-Sheét 3
, .ykzsa
39 4s
Patented Dec.v 3,1946
Frank Sutton, Cwmbran, England, assignor to
Saunders Valve Company Limited, Cwmbran,
Application April 3, 1943, Serial No. 481,747
In Great Britain March 30, 1942
4- Claims. (01. 137-153)
Consuming devices fed with pressure ?uid from
a supply system will cease to operate if the pres
sure in the system falls and may be left unat
nected to, or actually a part of, the principal v2.
or it may be separate and have its own spring,
in which case other means must be provided for
tended while still connected to the system, thereby
‘making it dangerous to restore the pressure in
locking it in open position when once it has
duction of a self-closing and self docking valve for
this and like purposes, which operates without
constant leakage of pressure ?uid in either its
erated cock needs to be held open until any tem- '
I porary fall of pressure due to ?ow into the down
Where the auxiliary valve is actuated by the
the system when the cause of failure has been
principal valve the manual operation necessary
remedied. As a safeguard against such danger it
to enable the principal valve to re-open after the
has been proposed to connect consuming devices
to the system by a valve which closes automati
the operation
pressure of
hasa been
0001; restored
by whichmay
the consist
supply of
cally when the pressure falls below a determined 10
‘cut on‘,
value and does not re-open if the pressure is re
notwithstanding that the auxiliary valve is open,
stored, except after a manipulation by an at
and the existing pressure is relieved by release oi’ v
tendant who should satisfy himself that no danger
?uid to the atmosphere; theopening of the valve
will result.
The object of the present invention is the pro 15 will close the auxiliary valve. The manually op
stream capacity of the system has ceased, but it
' must then be restored to its original position. To
this end it may be provided with a restoring spring
such valves is on compressed air systems operating
so that it returns as soon as it is no longer held;
pneumatic tools in mines where the air is heavily
open or its closed position.
A common use for
laden with dust, and it is important that the
valve shall operate satisfactorily and without
rapid deterioration even with dust-laden air as
the pressure ?uid.
To this end an auxiliary valve which opens un
der spring action when the ?uid pressure falls
su?ic'iently is arranged to bring the ?uid pressure
or it may be detained in open position against the
action of a restoring spring by a. catch which is
released by a piston subjected to the ?uid'pressure
on the downstream side of the valve. Similarly
where an auxiliary valve independent of the prin
cipal valve is held open against the pressure of the
?uid the means which detains it may be released
pneumatically as the result of a momentary open
to bear upon the valve to close it. So long as the
auxiliary valve remains open no subsequent in 30 ing of a release valve on one side of a piston to
both sides of which the pressure ?uid has access,
crease in the ?uid pressure can open the valve,
on the one side through a non-return valve and on
notwithstanding that the valve may when closed
the other side directly.
be subject to ?uid pressure in a direction tending
Two constructions of the invention applied to
to open it, because the increased pressure per
square inch is also brought to bear through the 35 diaphragm valves are illustrated in the accom
panying drawings—
auxiliary valve in a direction to close the valve.
Figure 1 being an axial section and
The total closing pressure may be made to ex
Figure 2 an elevation with a detail in section of
ceed any pressure in the opposite direction either
one construction, while
by biassing the valve by a spring towards its
Figure 3 is an axial section of‘an alternative
closed position, or by having the ?uid which 40
passes through the auxiliary valve act on a larger
area than is subject to ?uid pressure in the direc
tion for opening, for instance, inthe case of a
tappet valve upon a diaphragm attached to its
stern. Even when the valve is of the diaphragm
type and therefore well adapted to act as a piston,
it is desirable to provide a piston of larger area, '
to which the ?uid has access through the aux
-iliary valve, to operate the valve. A biassing
spring is still useful, though such a piston be pro
vided, to close the valve in case the ?uid pressure
drops suddenly to a negligible value. _
In both constructions the valve to be operated
comprises a diaphragm l, clamped on a casting
2 in a position vmore or less parallel with a ?uid
passage through the casting beneath it. The cast
ing presents a weir 3 extending across the ?uid
passage, and on this the diaphragm may by down
ward pressure be made to bed throughout a di
ameter of the diaphragm, thereby sealing the
The valve may normally be held open by the
pressure of the ?uid on its under surface againstv
the action of a spring 4. Intermeshing annular
combs 5, B, the one on the wall of the valve ac-'
In one simple construction this biassing spring
may be the spring which actuates the auxiliary
valve, the auxiliary valve being mechanically con 55 tuator casing], and the other forming the spring
7 ml
abutment, distribute the mechanical pressure and
the reaction to the ?uid pressure over the dia
phragm, so that it is not undesirably stressed.
' As soon as the pressure of the ?uid on them
derside of the diaphragm falls below the pressure
exerted by, the spring a, thevalve will begin to
close. It is undesirable that the valve should be
left to close under the possibly small difference be
tween these two pressures, so the initial move
ment of the valve should at least bring about the
equalisation of the ?uid pressure on its two sides
by admitting the ?uid above it, so that the valve
closes under the unresisted pressure of the spring.
Preferably a still greater closing pressure is
obtained by the use of a piston t of larger diam
eter than‘ the diaphragm, moving in a cylindrical
part of the valve actuator casing l. Fluid is
admitted to provide this balancing or over-riding
pressure by an auxiliary valve operatedv by the .
mentioned by the spring d and the position of
the shoulder 25. If the fluid pressure increases
after the. valve has been closed the piston 8 is
only held the more ?rmly upon the shoulder 25
and the, valve cannot open. The valve can only
be opened by hand operation of cock l4. By
turning the cock through a right angle the space
above the piston 8 is cut oil’ from the upstream
side of the main valve and is connected to atmos
phere. The pressure in the system can therefore
raise, the diaphragm ‘i and with it the piston 8
and thereby close the valve
The cock l4 should
return under spring action to its original position '
when released.
When it does so the valve 9 is _
not re-opened, since the pressure on the small
area of the valve is vastly less than the pressure
on the underside of the diaphragm.
The construction of the diaphragm valve shown ,i
in. Figure 3 is substantially the same as that of
initial movement of the main valve towards closed
position. In the construction shown in Figures 1
and 2 this auxiliary valve is formed by the end 9
of a stem ii secured to the diaphragm i. this
' by pressure on a piston a sliding in the actuator
small enough to prevent free ingress of moisture
by splashing. The piston 8 is made. tight in its
position without being damaged. The adjustment
the valve in Figures 1 and 2, and it, too, is closed
casing 1. ‘There is, however, no spring between
the piston and the valve, but instead a spring 28
end 9 seating on a sleeve 92 which is connected
above the piston, and the piston is screwed upon
by a pipe l3 with the upstream side of the chan 25 the stem 21 attached to the diaphragm. This
nel controlled by the valve 6, as shown, for in
connection affords a means for adjusting the dis
stance, in chain lines in Figure 2. In the pipe
tance between diaphragm and piston, so that not
I3 is a hand-operated three-way cock is shown
withstanding variations in the thickness of dia
in section in Figure 2..
phragms and tolerance in the distance between
The space within the casing ll below the piston 30 the shoulder 25 and weir 3 the diaphragm may
8 is open to the atmosphere through a hole l5,
be ?rmly pressed upon the weir in the closed
cylinder by a cup leather l8, and upon the stem
is locked by an eccentric set screw 30.
The control of the valve is di?erent inasmuch
. II by a hat leather I‘! to which the ?uid has 35 as the auxiliary valve by which‘ ?uid‘is admitted
access through channels it.
The stem H is
pinned to the‘ spring abutment 6, to the under
above the piston is not controlled by the differ
ence between the pressure of a ‘spring and the
side of which it is secured by a diaphragm attach
pressure on the diaphragm I, but by the di?er
ment stud with its head I9 moulded into the
ence between the pressure of a spring and the
rubber of the diaphragm i and secured by a ring 40 pressure on the auxiliary valve itself. The aux
2|v also moulded in, which prevents the annulus
iliary valve is here a grooved block 29 sliding in
of rubber above the head l9 from yielding out
a bore 3| in the cover 32 of the casing ‘I. At the
ward without shearing. A collar 22 on the stem
end of the bore is a rubber or like resilient seat I l enables the piston 8 to prevent the diaphragm’s
the valve. The valve is pressed towards
lifting irom closed position under a ?uid pres 45 its for
seat by a. spring 34 adjustable by screwing
sure su?lclent to compress the spring 4. Upward
the abutment 35 along the'outer threaded part
movement of the piston 8 is limited by the sleeve
of the bore 3|. The end of the bore 3| is closed
23 which can be adjusted in the cover 24 of the
by a screw block, and the hole is connected by
casing ‘I, in order that the pressure of the spring
4. upon the diaphragm may be adjusted to any 50 a channel 40 in the thickness of the cap 32 and
casing ‘I to the main ?uid channel on the up
desired value less than the normal ?uid pressure
sideof the main valve. The spring which
upon the diaphragm. The pressure of the dia
determines the opening of the auxiliary valve 29
. phragm upon the weir 3 in the closed position of
is the spring 36 which acts upon a piston, cam
the valve is limited by the provision of a shoulder
and valve unit 31. This unit is a, piston inasmuch
28 on the casing ‘I by which the descent of the 65 as it has cylindrical parts 38, 39, 4| which are
piston 8 is arrested. The sleeve I2 is adjustable
sliding ?ts in corresponding aligned bores 42, 43
in the sleeve 23 so that the end 9 of the stem H
in a boss 44 on the cover 32 and are made sub
may seat ?rmly upon it without preventing the
stantially ?uid-tight by grooves 45. It is a cam
diaphragm from bedding on the comb 5. Open
' inasmuch as its coned part 48 acts upon the stem
ings 26 in the sleeve 23 afford free communica-v 00 41 of the auxiliary valve 28. It is a valve inas
tion between-the bore of the sleeve l2 and the . much as its enlarged head 4! seals an opening
space above the piston d.
48 to the atmosphere in the shoulder connecting
If the ?uid pressure on the diaphragm I falls
two bores 42 and 43, being faced with rubber
below the pressure exerted by the ‘spring 4 in
the position of the parts shown in Figure 1 the 65 vor the like for that purpose. Moreover it carries
a one-way valve 49 which seals a central channel
5| through the unit under the action of a light
it the stem I l. The valve 9 is therefore opened
spring 52. A lateral branch 53 from the channel
and ?uid passes from the upstream side of the
5| extends to the cylindrical surface of the part
main valve through the pipe l3 and cockv I4 to
38 of the unit 31. The spring 36 by which the
the space above the piston 8. The main valve. 70 unit 31 is pressed down and the valve 4| held
then promptly closes under the excess of the ?uid
closed abuts on a cap 54 screwing upon the boss
pressure on the piston over that on the dia
44. The ‘spring 52 which holds closed the non
phragm. This excess will vary with the ?uid
retum valve 48 abuts upon and within a block
pressure, but the maximum pressure bedding the
55 on the stem of a press-button 56 sliding in
diaphragm on the weir 3 is determined as above 75 the cap 54 and normally enclosed by a pivoted
diaphragm will begin to descend carrying with
2,412,105 ‘
disc 51 which can be locked by a padlock 58.
The block 55 also forms a'valve, sealing by a
rubber disc the opening in whichqthe stem of the
press-button slides.
In this construction auxiliary valve 29 opens
when the pressure of the ?uid upon it added to v
the pressure of its own spring 34 is overcome by
the pressure of spring 36 exerted through the
pressure-?uid-actuated means for closing said
valve, an auxiliary valve controlling the ?ow of
?uid from the upstreamiside of said valve to said
closing means, spring-actuated means for open
ing said auxiliary valve when the pressure of the
?uid falls, and’ for locking it in open position,
and a hand-operated cock for making the ?uid
admitted through said auxiliary valve e?ective
to release .said locking means in opposition to its
cam 46 upon its'stem 41; springs 34 and 36 are
strong enough to make the friction of the cam 10 actuating spring.
2. A self-closing and self-locking valve, com
and other parts relatively-negligible. When this
prising a, body in which is a- channel for the ?uid
occurs the unit 31 moves downward to the position
' to be controlled, a valve for closing said channel,
shown in Figure 3 and the valve 29 is_?rst opened
pressure-?uid-actuated means for closing said
by the coned part of the cam 46 and then held
valve, an auxiliary valve controlling the ?ow of
open by the reversely coned part next above the
?uid from the upstream side of ‘said valve to said‘
cone. The ?uid can therefore pass through the
closing means, means for opening and holding
valve into the space above the piston 8, fprce the
piston down and close the main v'alve I.‘ If the . open said auxiliary valve including a cylinder to
which the ?uid has access through said auxiliary
pressure should fall suddenly to zero the valve I
valve, a piston in said cylinder, a one-way valve
will nevertheless be closed by the spring 28, sub
in said piston allowing ?uid to pass from the side
sequent increase of ?uid pressure cannot reverse
next the auxiliary valve to the other side, a spring
these events, the cam 40 not being movable by
said piston in the direction for opening
the stem 61; the only effect of such increase is
said auxiliary valve, and a hand-operated cock
to hold the piston 8 more firmly upon the shoul
for temporarily holding closed said one-way valve
der 25. To re-open the valve I access must be
‘and releasing the ?uid which‘ has passed
had to the push-button 56, and the button must
be pressed down. The ?uid contained within the
bore 43 of the boss 44 then escapes around the
press-button stem and the press-button or along
through it.
3. A self-‘closing and self-locking diaphragm
valve, comprising a body in which is a channel
grooves in their surface. No more ?uid can enter 30 incorporating a diaphragm seat,,a diaphragm ~
this bore because the non-return valve 49 is ?rmly
held on its seating so long as the press-button is
held down. So the ?uid pressure on the under
side of the piston, cam and valve unit 31 lifts the
adapted to bed on the seat to close the valve, an
opening in the channel opposite the diaphragm,
?uid-actuated valve-closing vmeans including a
conduit connected with the channel on the up-_v
unit, provided it exceeds - the pressure of 'the 35 stream side of the diaphragm for bringing the
?uid pressure to bear to close the channel, an
springs 36 and 52, the ?nger pressure being rela-4
auxiliary‘ valve in they conduit normally held in ,
tively negligible if full ?uid pressure has been
closed position by the pressure oi.‘ the controlled
restored: if the ?uid pressure is insu?lcient noth
?uid, spring means for opening the auxiliary
ing further happens. If the unit 31 rises the cam
46 permits the auxiliary valve to close, and the 40 valve when the ?uid pressure 'falls, and locking
, means releasable only by the pressure of the con
valve 4| opens. The ?uid above the piston 8
- can then escape through 5|, 53 and 48, and the ~y trolled ?uid upon it for holding said auxiliary
valve in open position. ,
?uid pressure at ?rst upon one half and subse
4. A self-closing and ‘self-‘locking diaphragm
quently on the whole of the diaphragm I can lift
‘valve, comprising a body in which is a channel
the diaphragm and the piston to open position.
incorporating a diaphragm seat, a diaphragm
11' it should be desired to close the valve I not
adapted to bed on the seat to close the valve and
withstanding that there is full- ?uid pressure in
?uid-actuated valve-closing means including a
the passage it controls, this may be done by press
movable piston above the diaphragm, a conduit
ing down the press-button 56; for the cam 48 is
connected with the channel on the upstream side
thereby pressed down mechanically and retained
of the diaphragm, the space between the piston
by the valve-stem 41, and the valve 29' is opened;
and the diaphragm being open at all times to
the valve I will open again upon a second de-._
atmosphere, and means controlled by the pressure
pression of the press-button.
of the ?uid for bringing the ?uid through the
' What I claim is:
conduit to bear on the piston to, move the piston
1.- A self-closing and self-locking valve, com
prising a body in which is a channel for the ?uid , and the diaphragmwto, close the channel.
to be controlled, a valve for closing said channel,
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