US1687351A - Gas safety valve - Google Patents

Description

F. E. SCHOOLFEELD GAS SAFETY VALVE Filed June l7, 1927 I N VEN TOR. 3??? :1, C1? 6. u a

ATTORNEY.

Patented (Pet. 9, 1928.

FREDERICK E. SCHOOLFIELD, OF CQVINGTON, KENTUCKY.

GAS SAFETY VALVE.

Application filed June 17,

My invention relates to valves whereby a supply of gas or fluid under pressure is automatically cut off when pressure in the supply no longer exists. My invention is more particularly applicable to devices utilizing combustible gases.

Heretofore, where the ordinary type of valves have been employed, serious accidents have been caused by the supply of gas being 1 interrupted and thereby extinguishing the flame. l/Vhen the supply is renewed the gas is not consumed and pervades the building in which the device is located, forming an explosive mixture with the air. Also, this may cause asphyxiation of persons in the building, especially where natural gasis used, as it has practically no perceptible odor.

' The objects of my invention are to provide a -si-mple,eii"1cient and durable means for automatically shutting off the flow of gas or fluid under pressure when pressure is reduced belownormal, or no longer exists, thereby prop neck 16., the center of which is provided viding safety means to preventexplosion,

suffocation or asphyxiation, due to the tomporary stoppage of the flow of gas which extinguishes the flames, so that when pressure is resumed, the gas is prevented from escaping into the room'where it would cause probable dangerous results.

My invention consists in means whereby the-above objects are accomplished and in the construction, combination, location and arrangement of partsas herein set forth and claimed.

In the drawings:

Fig. 1 is a side elevation ofmy novel gas safety valve shown in the operative position,.

= arts a )earin in vertical section dotted Q P:

lines, and in elevation;

Fig. 2 is a horizontal cross-section taken on a plane corresponding to line 22 in Fig. 1; r

Fig. 3 is a detailed view of the expansible member used for operating the valve shown 4a) in expanded position and showing the base member by which it is supported;

Fig. 4: is an enlarged vertical section taken on a plane corresponding to line 4-41 in Fig. 3;; and

Fig. '5 is a detailed view of the gravity valve. f

In the embodiment of my invention as illustrated and which shows a preferred construct-iofn, I provide a gas safetyvalvecomprising cylindr cal body 1 which is divided into chamber 2 and lower chamber 3,-

1927. Serial No. 199,539.

Casket or'washer 13 is preferably inserted between closure cap 5 and lower end 1* of cylindrical body 1, for they purpose of insuring an air-tight jointure between said cap and body. Said closure cap 5 is also provided with a drain plug 14, which may be easily removed therefrom by inserting a tool such as a screw-driver) within slot 15 and turning in an anti-clockwise direction.

Integrally formed with,and centrally dishole 17 and enlarged recess or socket 18. Gasket or washer 1 9 is preferably insertedbetween said closure cap 6 and end 1 of cylindrical body 1 for the purpose of insuring an air tight jointure between said capand body. Said threaded neck 16 of closure cap .6 is

osed of, closure cap 6, is externally threaded with I received by threaded opening 20 of cross 21. Said cross '21 is also provided with threaded openings 22, 23 and 24, respectively.

Leading from T 25 (in inlet supply pipe 11) to cross 21 is byepass 26 and leading from T27 (in outlet supply pipe 12) to cross 21 is by-pass -28. Said by-pass 26 comprises stopcock 26*,elbow 26?, nipple 26, union;26, and nipple 26, the outer threaded end of which is received by threaded opening 22 of cross 21, as clearly shown by Fig.1. By-pass 28 comprises nipple 28, stop-cock 28 nipple 28, elbow 28 nipple 28 union 28, and nipple 28*, respectively, the outer threaded end of the latter being received by threaded opening 24 of cross 21. Externally threaded neck 29 of base 30 is received by threaded opening 23 of cross 21 and-is provided with centrally dis-posedhole 31 through which valve rod 32 passes. The upper end 32 of valverod '32'is securely attached to expansible member 33 (such as a rubber balloon) by nut 34 screwed onto threaded end 32 of said valve rod 32, as clearly shown in the sectional view, Fig. 4;.

Referring now to Fig. 5, the portion 35 of valve '36'ispreferably disc-shared, the outer periphery 37 .of'which alidably ts with ion in inner periphery 33 of upper chamber 2 of cylindrical body 1. The bottom of body portion 35 is preferably faced with a resilient material, such as leather 39, to insure proper seating upon the upper side 10 of integral partition 1, as shown by dotted lines in Fig. 1. Partition 4; is provided with tapered opening 11 (through which the gas passes, as will be described later) and into which cone 12, integral with valve 36 is received, and which will also be described later.

Boss 13, centrally located. on the top 44: of valve 36, is provided with threaded opening 4-5, which opening receives the lower threaded end 416 of valve rod 32.

When valve 35 is in the raised or operative position (shown by full lines in Fig. 1) and on account of the hole 17 in neck 16 being of a larger diameter than valve rod 32, I provide tapered plug or washer 17 which is held against downward movement upon said valve rod 32 by collar 48 and set-screw 19. Said washer 47 is adapted to fit within recessor socket 18 of neck 16, thereby insuring against the gas passing from within cross 21 into chamber 2, as will be described later on, under operation of the device.

, When valve 35 is in the lower position within chamber 2, as indicated by dotted lines in Fig. 1, washer 50 is held against the top 51 of neck 16 by coil spring 52, which spring is put under slight pressure against washer 50 by obstructions 52 preferably formed integral with valve rod 32.

The opening or aperture of expansible member 33 snugly fits over upwardly extending neck 30 of base 30 and is secured thereon as by band clamp 53.

To protect said eXpansible member 33, I provide glass cylinder 54: which fits within upturned edge 30 of base 30 and which is held upon said base by cap 55 and retaining rods (also shown by dotted lines) of a stove, furnace, or similar gas consuming device, and that the gas pressure coming through said supply pipe A is normal and that stop-cock 26 is closed, as shown in Fig. 1, said gas pressure will hold valve 36 in the open position, as shown by full lines in said figure, and will flow in the direction of arrows C through T 25, inlet supply pipe 11, into chamber 2 through tapered opening 41 in partition 4 into lower chamber 3 into outlet supply pipe 12,

through T 2'? and into pipeB. Should thegas be turned off or the supply decreased to such an extent as to extinguish the flame of said gas consuming device attached to pipe B, valve 36 will automatically drop by gravity to the closed position shown by dotted lines in Fig. 1 thereby closing the tapering opening 11 in partition 1 and bringing said valve below threaded opening 7 leading into upper chamber 2. Should the gas again be turned on, or the pressure increased in inlet supply pipe 11, said gas will accumulate in upper chamber 2 but will beprevented from passing through tapered opening 11 andinto outlet supply pipe 12 until the valve is again adjusted by manual operation as follows:

To reset this improved gas safety valve the first step is to close stop-cock 28 and open stop-cock 26s. After stop-cock 26 is opened the gas pressure will pass through by-pass 26 into the interior of cross 21 and then upwardly through hole 31 in base 30, thereby inflating expansible member 33, which inflation raises valve rod 32 and valve 36 upwardly from the dotted position shown iii-Fig. 1, to

the position shown by full lines in said'figure,

thus raising said valve above threaded opening 7 of cylindrical body 1. After said expansible member 33 has'been inflated sulficiently to raise said valve from the closed position to the open position, stop-cock 26 is again closed and stop-cock 28 is again opened, thereby causing the gas pressure to be beneath said valve 36, and thereby holding said valve in the raised position whereupon the gas will flow in the path indicated by arrows C.

An advantage of this invention is that improved gas safety valve is extremely simple, compact and of economical construction and is adapted to effectually perform the desired functions.

A further advantage of my improved de vice is that it positively insures the automatic shutting off of the gas when the flow through the supply pipe A is interrupted sufliciently, so that the flame is extinguished on the consuming device attached to pipe B, thereby avoiding any dangerous results, which would occur should the consumed gas be allowed to escape without being ignited.

It will be understood that my invention is capable of modification without departing from the scope or spirit thereof as defined in the claims.

What I claim as .new and desire to secure by Letters Patent is:

1. 1n an automatic gas shut-ofi valve, the combination of a cylinder divided into two chambers, an inlet supply pipe connected to one of said chambers, an outlet supply pipe connected to the other of said chambers, a partition between said chambers having an opening therein, a four-way fitting mounted upon said cylinder, aby-pass leading from said inlet supply pipe to said four-wayfitting, a second by-pass leading from said outlet supply pipe to said four Way fitting, an expansible member located above said four-way fitting, a valve stem'attached to said expansible member, and a valve on said stem whereby said valve is held in open position providing the gas flow or pressure is normal, substan tially as set forth and for the purposes specilied.

2. In an automatic shut-01f valve, the combination of a body composed of an upper chamber and a lower chamber, a partition dividing said chambers and having a hole therethrough, an inlet supply pipe connected to one ofsaid chambers, an-outlet supply pipe connected to the other of said chambers, a four-Way fitting mountedupon said chambers, a by-pass leading from said inlet supply pipe to said four-way fitting and having a stop-cock therein, a second by-pass leading from said outlet supply pipe to said four-Way fitting, an cxpansible member located above said tour-way fitting, a valve stem attached to said expansible member and a valve on said stem whereby said valve is held in opened position providing the gas flow or pressure is normal, substantially as set forth and for the purposes specifie d FREDERICK E. SCHOOLFIELD.

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