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Патент USA US2076566

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April 13, 1937.
Filed March 2l, 1952
âeazye Wlïfball
Patented Apr. 13, 1937
` 2,076,566
George W. Isbell, Baltimore, Md.
Application March 21, 1932, Serial No. 600,310
3 Claims. (Cl. 137-153)
This invention relates to a safety control valve
and has for an object to provide an improved
safety control valve especially useful in connec
tion with a fluid fuel burning heater such as an
oil burning boiler.
It is a further object of this invention to provide
a safety control valve for an oil or gas burning
heater or boiler and the like which will make it
impossible to light up the heater or boiler unless
water is actually flowing through the coils.
It is a further object of this invention to pro"
vide a safety control valve for an oil or fuel burn
With the safety device of this invention all
such dangers such as ñre hazards and destruc~
tion of boiler tubes would be eliminated.
The safety control valve is shown in general at
I0. Passing through this valve is a water pipe II
feeding the water from the pump (not shown), in
the direction of the arrow through the pipe Il,
into the Valve It, through the pipe I2, the back
pressure check valve I3, and the union Ill, which
boiler (not shown).
the boiler or steamer for any reason whatsoever.
As is well known in boilers or Steamers using a
constant supply of water to replace the steam
through a cut off valve Il and a pipe I8, leading
to the burner (not shown). The pipe II feeds
given off, a damaging and dangerous explosion
while the fuel supply continues to heat the boiler.
To prevent this the safety control valve com
prising this invention is so constituted that it
will immediately cut off the fuel for the oil or
25 gas from the burner when either the water supply
fails or the water supply is blocked in the boiler,
causing back pressure in the Water supply line.
With the foregoing and other objects in view,
as will hereinafter become apparent, this inven
tion comprises the constructions, combinations,
and arrangements of parts, hereinafter set forth,
disclosed and shown on the accompanying draw
ing. In this drawing,
Figure 1 is a side elevation of the safety control
valve, and
Figure 2 is a sectional view taken on line 2-2
to the workers in the shop. .
ing heater` or boiler which will automatically cut
off the oil or fluid fuel from the boiler instantly
should the water fail to feed continuously into
will occur should the water supply be cut off
and ruining the boiler or steamer as well as caus
ing a possibility of serious damage to the shop and
of Figure l showing the operation of said safety
control valve.
The valve constituting this invention will work
satisfactorily on steam from l0 lbs. to 400 lbs.
pressure and is an entirely safe device for such
purposes. The type of steamer or boiler that this
valve is made to work on is commonly used in
garages, paint shops and the like. 'I‘he steamer
, or boiler itself includes a series of coils and is
fed by a hydraulic pump forcing water through
these coils at approximately 125 lbs. This Water
is heated by an oil burner, the water entering the
bottom and passing out of the top turned into
steam. Should anything happen to this water
pump or to the electricity or motor operating
the pump, the water would cease flowing into the
coils and the fire would continue burning with
no Water going into the coils. This would very
55 shortly burn through the coils causing explosion
is threaded at I 5 for connection to the coil of a
The oil or fuel supply passes through a pipe it l.
the water or fluid into a chamber I9 which is
closed olf by a diaphragm 20, this diaphragm 2E
being made preferably
of two sheets of flexible V~b) (D
copper secured between the valve body 2l and the
valve body
20 iscap
a seat
22. 23Resting
in the chamber
on top of2lithe
between the diaphragm 20 and the Valve body 2 i,
the seat 23 having secured thereto the stem 25.
The stem 25 passes into the chamber 2li through
a leak proof packing 2S, which however will al
low the stem' 25 to move upwardly and down
wardly therethrough.
Surrounding the stem 25 within the chamber
24 is a spring 2l tending to press the seat123 and
hence valve stem 25 downwardly, this spring be
ing of such a strength that it takes at least 6
lbs. of pressure to compress it/to the position
shown in Figure 2. Adjustably secured to the 5
stem 25 by means of the lock nuts 28 and 29 is
a rectangular shaped yoke 30, the top of this
yoke 3U being spaced slightly above the top 32
of a needle valve 33, the top 32 of needle valve
33 having a cross bar 3| serving as a handle.
'I'his needle valve 33 passes into the valve body
2l through a leak proof packing 35 Which may
be adjusted by the nut 34. A back pressure pipe
36 secured to the union I4 at 31 enters the cham
ber 2li at 38.
In operation, this safety control valve will work
satisfactorily on steam from 10 lbs. to 400 lbs.
pressure and is an entirely safe device for such
purposes. The water is supplied from a hy
draulic pump (not shown) at approximately 125
lbs. of pressure, passing through pipe II, the
chamber I9, the pipe I2 and the back pressure
check valve I3 and union I4, through the threaded
end I5 to the coils in the furnace.
As will be observed, the back pressure check 55.
valve I3 is a poppet valve allowing the pressure
to open the Valve in the direction that the water
should normally flow as shown by the arrow, but
not allowing any pressure to pass in the opposite
5 direction. This valve will be said to operate
preferably at 10 lbs. pressure, thereby insuring
the seat 23 and stem 25 to draw down the yoke
30 and close the needle valve 33 in the oil supply
valve I1.
The novel features and the operation of this
device will be apparent from the foregoing de
scription. While the device has been shown and
the structure described in detail, it is obvious that
that there will be at leastI 6 lbs. pressure to com
press the spring 21. When the spring 21 is so this is not to be considered limited to the exact
form disclosed and that changes may be made
compressed it will raise the yoke 3U to the posi
1G tion shown, allowing the needle valve 33 to be therein within the scope of what is claimed
manually raised by means of the handle bar 3l, withoutv departing from the spirit of the inven
thus opening the valve I1 and allowing the oil tion.
Having thus set forth and disclosed the nature
to flow through from pipe I5 to pipe I8 to the
burners in the furnace. As will be observed, the of this invention, what is claimed is:
l. A safety control valve comprising a fluid 15
l5 pipes I6 and I8 are secured on ñngers 39 and 4D
line and a fuel supply line, a cut off valve
projecting upwardly from the valve body 2|.
Should for any reason the water supply through in said fuel supply line, a pressure chamber in
pipe II fail coming, as for instance if the pump said fluid supply line, a back pressure chamber,
should break down or the motor for the pump a flexible diaphragm separating said chambers,
20 cease to operate, the pressure in chamber I9 will means connecting said back pressure chamber to
drop away to approximately nothing, Spring 21 the fluid supply line, and means operable by said
will then expand against the flexible diaphragm diaphragm upon increase in pressure in said back
20 drawing stem 25 down with it, which in turn chamber over the pressure in said pressure charn
will draw yoke 30 downwardly and the top of the ber to operate said out off valve, said means being
spaced from said cut off valve.
‘25 yoke 30 will press against the top 32 of needle normally
2. A safety control valve comprising a fluid
valve 33 downwardly until the needle valve 33 supply line, a fuel supply line, a cut oiî Valve in
will immediately and completely close off the valve said
fuel supply line, a pressure responsive means
I1 and instantly stop the supply of oil or gas
fluid supply line, a yoke connected to
flowing into pipe I8 and automatically cause the
said pressure responsive means, said yoke being
30 ñre in the boiler to be extinguished through lack normally
positioned adjacent to but spaced from
of fuel, thereby preventing any possibility of said cut 'off
valve, said pressure responsive means
explosion in the boiler or steamer.
to move said yoke into contact
If the steam generated in the boiler should
fail to continue through the coils in the proper with said cut off valve to move the latter to
35 manner and instead should work back-through closing
3. A safety control valve comprising a ñuid
the water supply pipe 55, the poppet valve in
valve I3 will immediately close, causing the back supply line, a fuel supply line, a out off valve in
pressure to exert itself through the back pres
sure pipe 36 and opening 38 into chamber 24.
40 The pressure in chamber 24 will then become
greater than the pressure in chamber I9 and the
diaphragm 20 will yield to allow spring 21 to
move seat 23 downwardly, thus moving the stem
25 downwardly and yoke 30 to close the needle
45 valve 33 in the same manner as above described.
As will be seen, this safety valve operates to
cut off the fuel supply which may be oil or any
other liquid or gaseous fuel immediately when
ever the water supply should fail or when there
50 is greater back pressure through the water sup
ply line than the pressure in the water supply
line can overcome.
Whenever this condition
arises the spring 21 operates immediately through
said fuel supply line, a pressure chamber and a
back pressure chamber connected to said fluid
supply line, a flexible diaphragm separating said
pressure from said back pressiu‘e chamber, a
valve in said fluid line keeping the pressure in
the pressure chamber normally in excess of the
pressure in the back pressure chamber, means
in said back pressure chamber tending to close
said fuel cut olf valve, Ysaid means being nor
mally spaced from said valve, said valve closing
means being maintained in normally spaced con
dition when the pressure in the pressure chamber
exceeds the pressure in the back pressure charn
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