US2271833A

US2271833A - Thermostat controlled valve

Info

Publication number: US2271833A
Application number: US337924A
Authority: US
Inventors: Carl N Shipman; Roy P Grissom
Original assignee: DAN C PAXTON; R G LETT
Current assignee: DAN C PAXTON; R G LETT
Priority date: 1940-05-29
Filing date: 1940-05-29
Publication date: 1942-02-03
Anticipated expiration: 1959-02-03

Description

Feb. 3, 1942. I s pm ETAL 2,271,833

IHERMOSTAT' CONTROLLED VALVE I Filed May 29 19310 Carl flay}? 6921530770v 4 WITNESS ATTORNEYS Patented F eb.'3, 1.942

UNITED STATES PATENT OFFICE THERMOSTAT CONTROLLED VALVE Carl N. Shipman and Roy P. Grissom, Oklahoma City, Okla.; said Shipman assignor of sixteen and two-thirds per cent to R. G. Lett and sixteen and two-thirds per cent to Dan C. Paxton, both of Oklahoma City, Okla.

Application May 29, 1940, Serial No.s37,924

' 1 Claim. (01'. 277-21) 'This invention relates to thermostat controlled valves and has for an object to provide a device of this character particularly adapted for automatic fire sprinkler control.

Ordinarily, when a fire raises the temperature of a building protected by a sprinkler system, the

sprinkler head operates continuously to flood the building with water until the arrival of the fire department. With this in mind it is an object of the present invention to provide a simplified form of thermostat controlled valve which may be used as an individual control valve for each separate sprinkler head and will automatically cut off the water supply from the operating. sprinkler head when the temperature has decreased below the danger point and thus prevent needless flooding of the building with water.

A further object is to provide adevice of this character which will be positive in operation and which will always bein operative position under severe conditions of service.

A iurther, object is to provide apparatus or this character which will be formed of a few strong,

simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in view the invention consists of certain noveldetails of construction and combinations of parts hereinafter fullydescribed and claimed, it being understood 3 that various modifications may be resorted to within the scope of the appended claim without departing from the spirit or sacrificing any of the advantages of the invention.

' In the accompanying drawing forming a part 1 of this specification:

The figure is a longitudinal sectional view of a thermostat controlled valve constructed in accordance with the invention and showing an alarm device diagrammatically.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, It] designates a main valve casing having alined sprinkler head and inlet pipes II and I2 connected thereto. A cylinder 13 is mounted upon the open top of the main valve pression spring 20 is sleeved on the stem l5 and bears against the valve l8 and against the bottom head ll oi the cylinder to hold the valve seated. 4/ I A cylinder valve housing 2| is disposed adjacent to one side of the cylinder l3 and is connected to the cylinder 13 below the piston l4 by a pipe 22. A valve seat 23 is formed in the housing 2| at the bottom of the pipe 22 and a needle valve 24 is mounted to seat upwardly in the valve seat 23. The needle valve is equipped with a stem 25 which projects through the bottom closure cap 26 of the cylinderical valve housing and a helical compression spring 21 is sleeved on the valve stem and tends to constantly hold the needle valve closed.

A by-pass pipe 28 is connected to the valve housing Ill on the inlet side thereof and is connected to the cylinderical valve housing 2! below the valve seat 23 to permit fluid to pass into the cylinder [3 below the piston l4 through the pipe 22 when the needle valve 24 is opened.

A push rod 29 is engaged through the top closure cap '30 of the cylindrical housing 2! and loosely engages a guide shoulder 32 which projects inwardly from the top of the housing. The lower end of the push rod abuts the top of the needle valve 24 which latter, when seated,

projects slightly'above the valve seat 23. The, push rod is provided axially with a vent opening 33 which opens through the top of the push rod through an enlarged recess 34 and opens through the side of the push rod through a laterally directed branch opening 35.

A thermostat 36 of the bellows type is mounted on a bracket arm 31 which is secured to the top head 38 of the cylinder l3 by screws 39, or other connectors, laterally of avent opening 40in the cylinder head 38. at the bottom with a stem M which is equipped with a rubber disk valve 42. The valve is secured to the lower end of the stem by a screw. 43, or other connector, and is adapted toseal the upper end of the vent opening 33 when thethermostat expands.

vA tubular collar 44 i snugly sleeved on the stem 4| and is fixedly connected at the upper end to the stem by a pin 45. v

A block of insulation 46 is fixed to one side of the tubular collar 44 in any preferred manner and a switch contact 41 is secured to the block by a screw 48.. A grounded switch contact 49 is secured to the tubular valve housing 2| to cooperate. ith the switch contact a! in controlling a signal circuit 50 to a buzzer 5| which is connected to a battery 52. I l

'The thermostat is provided In operation, when temperature rises to 9. danger point as in the case of fire, the thermostat 36 will expand and move the stem 4| downwardly, first until the valve 42 seals the vent 33 and subsequently moves the push rod 29 downward to open the needle valve 24. When the I needle valve 24 is open fluid pressure through the Y 21 to close the needle valve 24 thereby returning the push rod to normal position. Liquid in the cylinder l3 below the piston i4ithen escapes through the pipe 22 and air vent 33 past the open valve 42 and'downward inside the tubular collar 44 where it wastes over the top of the tubular valve housing 2|. The spring 20 then moves the piston I4 to neutral position and closes the disk valve l8, the vent opening 40 preventing I any vacuum in the topof the cylinder 13.

From the above description it is thought that theconstruction and operation of the invention will be fully understood without further explana- 0.

tion.

What is claimed is:

A pilot valve comprising a cylindrical housing, a pipe entering the housing adapted for connection with a main valve, a valve seat in the housing below the pipe, a spring pressed needle valve in the seat projecting above the seat and closing upwardly, a by-pass pipe entering the housing adapted for connection with the intake side of a main valve permitting fluid to pass into the housing and out through the first named pipe when the needle valve is open, a push rod slidably mounted in the housing and abutting the top of the needle valve, there being an axial vent in the push rod opening through the top of the push rod and through the side of the push rod, a stem disposed above the top of the housing adapted to operate the push rod, a valve on the stem adapted to close the vent opening in the top of the push rod when the push rod is moved by the stem to open the needle.valve, retrograde r CARL N. SHIPMAN. 1,203! P. GRISSOM.