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Патент USA US2120242

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June 14, 1938.
w. s. DIEHL
2,120,242 .
‘ AUTOMATIC CUT-OFF‘ VALVE
Filed Aug. 12, 19:56
\-___ ____
___.__.._
INVENTOR
B
YWALTER S. D/EHL
a
ATTORNEY
'
Patented June. 14,1938
} I , 2,120,242
UNITED‘ STATES
PATENT OFFICE . '
- 2,120,242
‘AUTOMATIC CUT-OFF VALVE \
Walter S. Diehl, United States Navy '
Application August 12, 1936, Serial No. 95,570
3 Claims. (01. 137-153)
(Granted under the act of March- 3, 1883, as
-
' amended April 30, 1928; 3'10 0. G. v‘157)
invention relates to improvements ‘in au
tomatic cut-oft‘ valves to prevent the loss of the
?uid under pressure, in the event of a rupture in the system.
5
_
~
An important object of this invention is to
provide an automatic cut-o?‘ valve, in a system
Fig, 2 shows a toggle l3’ attached to the
plunger ll by'a pivot 23.
Fig. 4 and Fig. 5 show the longitudinal 'slots or
grooves III in the plunger 9 replaced by longi
tudinal holes l0’.-
supplying ?uid under pressure, which may be ‘ is as follows:
regulated so as to automatically close should the
piping on the discharge side of the valve become
10 broken, or 'suifer any casualty which would
5
-
Before putting the valve 6 into operation the
plunger spring I5 is set ata predetermined ‘ten
sion by means of adjusting nut l6 so that the 10
toggle l3 will maintain the plunger 9 in its normal
A further object of the invention is to provide position,‘ as shown in ‘Fig, 1. The valve is armed
a means for rearming or resetting the valve when - or cocked by pushing'spindle‘ l9 into engagement
the operator desires to again put the ?uid sys
with valve face I2 and continuing this move
tem into commission.
ment until the plunger 9 is returned to its normal 15
Other objects and advantages of the inven
position. . With the valve 6 so armed, the ?uid
tion will be apparent during the. course‘ of the under pressure ?ows into the'valve 6, the inlet
result in a loss of the ?uid.
, l5
-
The operation of the automatic cut-oil‘ valve »
n
following description.
In the drawing, forming apart of this speci?
20 cation, and in which like numerals are .employed
‘to designate like parts throughout the same,
Fig. 1 is a cut-away side elevation of‘ the as—
sembled valve;
r
Fig. 2 is a modi?cation of the plunger with a
25 pivoted toggle rather than a sliding toggle;
Fig. 3 is a section on the line 3-—3 of Fig‘. 2;
Fig. 4 is a side elevation of the valve plunger
1, thence through the longitudinal slots, grooves _
or holes III of plunger 9 and through the valve
opening I8, and thence through outlet 8. Should
20
I any rupture take place in the ‘system on the out
let side of the automatic vcut-out valve the pres
sure on this side of the valve body 6 will imme
diately drop to zero, as will the pressure on the
downstream side of the plunger 9. The pressure
which is acting on the upstream face of plunger N) 5
9 will be exerted on it and will overcome the pres
sure exerted on the plunger 9 by the toggle l3 and '
showing it drilled with several longitudinal holes
. will cause the plunger 9 to travel along the cylin
rather 'than longitudinal slots or grooves; and
der of the valve body 6 and force the valve mem
30
Fig. 5 is an end elevation of Fig. 4.
In the drawing, wherein for the purpose of ber l2 into- engagement with the valve seat l8,
illustration, is shown a preferred embodiment of thus sealing it to prevent any further ?ow of the
my invention, the number 6 designates the metal ?uid through the outlet 8._ The size of the valve
valve
body with a ?anged inlet opening 1 and body 6 and plunger 9 depends upon the'pressure
35
?anged outlet opening 8.
,
~ Contained within the valve body is a plunger 9
provided with longitudinal grooves or slots Ill,
an annular groove II, and a valve member I2.
40
Resting Within the annular groove H is a
toggle 13, which toggle is securely held in place
by a grooved plunger M, which is slidablyemount
drop required to trip toggle i3. The size of the 35
toggle l3 depends upon the tripping load diiferen
tial, which is dependent on the maximum rate of
normal ?ow throughthe valve body 6, and the
viscosity of the ?uid. An approximate size may
readily be calculated from the equations of lhy- 40
drodynamics, and the‘ exact relations may be
found by adjusting, the tripping load on the
ed in a cylindrical boss I4’ formed integrally with toggle'spring.
the valve body 6. A plunger spring I5 is also dis
It is understood that the form of my invention,
45 posed within the boss l4’ between the plunger l4
shown and described, is to be taken
and an adjusting nut l6, which is threaded into , herewith
as a preferred example of same, and the various
the upper end of the boss ii’. The upper endof changes in the shape, size and arrangement of
the boss i4’ ‘is closed by a cap screw 11.
parts’may be resorted to without departing from
The valve member I2 is machined to seat on a the spirit of my invention, or the scope of the
50 valve seat l8 surrounding an opening l8’. A re
subjoined claims.
~
I
seating spindle is is manually operable through
The invention described herein may be manu
~ a stu?ing box 20 by a knob 2| for the purpose of
factured and used by or for the Government of
rearming the valve member l2. A raised shoulder the United States of America for governmental
‘ 22 prevents the spindle l9 from being withdrawn purposes without the payment‘of any royalties
55 from the stu?ing box 20.
thereon or therefor.
v
45
50
t
55
2,120,242
Having thus set forth and disclosed the nature
of this invention, what is claimed is:
.
1. A valve operated by di?erential ?uid pres
sure comprising a cylindrical ?uid passage with
an ori?ce in the downstream end, a grooved pis
ton slidably ?tted in said cylindrical passage and
carrying a needle device on its downstream end,
said needle device ccaxially registering with said
downstream ori?ce a toggle device for holding
10 said piston and appendage ‘selectively away from
or against said ori?ce, and a rearming device for
setting said piston in a valve-open position
against the toggle action tending to keep said
piston in a valve-closed position.
2. A valve operated by differential ?uid pres
sure comprising a cylindrical ?uid passage with
an ori?ce in the downstream end, a perforated
ving said piston and appendage selectively away
from or against said ori?ce, and a rearming de
vice for setting said piston in a valve-open posi
tion against the toggle action tending to keep
said piston in a valve-open position against the
toggle action“ tending to keep said piston in a
valve-closed position.
-
_
3. A valve operated by di?'erential pressure
comprising a cylindrical ?uid passage with scored
walls and an ori?ce in the downstream end, a 10
piston slidably' ?tted in said cylindrical passage
and ‘carrying a needle device on its downstream
end, said needle device coaxially registering with
said downstream ori?ce, a toggle device for
holding said piston and appendage selectively
away from or against said ori?ce, and a rearming
device for setting said piston in a valve-open 'po- -
piston slidably ?tted in said cylindrical passage
sition against the toggle action tending to keep
and carrying a needle device on its downstream
said piston in a valve-closed position.
20
20 end, said needle device coaxially registering with
said downstream ori?ce, a toggle device for hold
‘ WALTER s. DIEHL.
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