US1885724A - Automatic cut-off valve - Google Patents

Description

Nov. 1, 1932. E. J. HORTON AUTOMATIC CUT-OFF VALVE Filed Feb. 17, 1952 IN VEN TOR W MQ W 14 1 ATTORNEYS Patented Novel, 1932 mam ERNEST J. HORTON, or PITTSBURGH, rnmvsvnvnma, ASSIGNQB. To noun MANUFAC- TURING COMPANY, A CORPORATION or NEW JERSEY AUTomA ro our-err vim Application filed. February 17, 1932. Serial No. 593,469;

This invention relates to valves, and more particularly to automatic cut-off valves, such as are adapted for use with fuels eitherin gas or liquid form. 1- v a An objeot'of this invention is the provision of an automatic cut-off valve arrangement, such as may be applied to mainand auxiliary burners, (for'example, a main' burner and a pilot burner) that shall be simple in construction, easily manufactured, efficient and positive in operation.

Another object of the invention is the provision of an automatic cut-"ofi valve arrangement for'controlling a main burner and an auxiliary burner, whereby upon the opening of a valve controlling the auxiliaryburner and the lighting thereof, another valve controlling the main :burner is automatically opened and thereafter both valves placed under automatic cohtrol so that upon failure of-the fuel supply .or upon the extinguish ment of the pilot burner, or both, for any reason, both valves' will be closed automatically. i 7

A further object of the invention is the provision of a multiple valve control whereby one-valve may be manually opened and latched in such position, and subsequently another valve opened'by means,'of a thermostatic device, the construction of the multiple valve control being such that when the thermostatic device has operated, all of the valves are placed under the control thereof.

Other objects of the invention will, in part,

vbeapparent and will, in part, be obvious from the following description taken in 'conjunc tion with the accompanying drawing in which; 7 p r M Figure 1 is a view partially in section and partially in side elevation of an automatic cut-'ofl'valve, as applied to a pilot or auxiliary burner and a main burner, the latter being illustrated by dot and dash lines;

Fig, 2is an endview of the cut-ofi valve; 1 Fig. 3 is a view in sectionof a portion of the valve shown in Figs; 1 and 2 taken on lines HI-III thereof; and Figs, 4 and 5 are views in front and side elevation, respectively, of a valve actuating and latching device embodied in shown'in Figs. 1 and 2-.

the valve Throughout the drawing and the specifi cation like reference characters indicate like parts. i

In Fig. 1 of the drawing,a main burner 1 is shown to which ,fuel, such as gas, is sup-v pliedfrom a supply line'2; The particular type of burner illustrated, is designed to operate either in the so-called automatic hot water heaters in which the supply of gas is i turned on and off at the main burner auto matically as the flow of water from such heatare is turned on and off in accordance with the demand for hot water; or in the storage type of heater where the gas to themain burner is turned on and ofi in accordance iliary burner 3 is provided. Burner 3is mounted on-the main burner as shownand is suppliedwith fuel or gas from an auxiliary k or branch line 5 which, it will be understood is connected to the main fuel supply line at a point ahead of the valve mechanism (not shown) which turns on or shuts OK the gas to the main burner. in accordance with the de- .mand for hot water, or in accordance with water temperature.

iliary burner 3-is burning at all times. Oc- "casionally, however, unexpected conditions arise whi h cause, the flame at the pilot or auxiliary burner 'to be extinguished. In

' Under normal conditions, the pilot or aux sucha case, gas would escape through the main burner, as Wellas the auxiliary burner or p lot l ght, unless provision were made to pilot burner is burning, andto provide for positively shutting off the flow of gas thereautomatically andpositively shut off the gas to in case the pilot or auxiliary burner is I extinguished a multiple valve 6 and a thermostatic device 7 are provided. The multiple valve controls the flow of gas to burners I land 3 and is under the control of the ther- 2 and an outlet 12 which is connected to the mixing chamber 13 of the main burner 1, the port 9 being interposed between the inlet and outlet of the valve body. Poppet valve 10,

' as shown, is normally urged towards its closed position by means of a coil spring 14;.

Valve body 8'carries a bonnet or cap 15 which serves asthe body for thevalve which is utilized to control the flow of gas to pilot or auxiliary burner3. As shown, the cap or bonnet has a flange 16 adapted to seat on the valve body. In order to provide a gastight joint between valve body 8 and cap or bonnet 15, a washer or gasket 17 of suitable form and composition is interposed therebetween. The bonnet or cap may be positive- *ly and rigidly secured to valve body 8 by .means of screws 18-(see Fig. 2).

Bonnet or cap 15Yis provided with an inlet port 20 to which branch line 5 is connecteg, and an out- 6 tion with the interior .bore, thereof. As

let port 21 which is connected ire'ctly to the pilot light-as shown. To provide for the flow of gas from the inlet port 20 to the outlet port 21, passageways 22 and 23 are drilled in the body 15 so as to provide communicashown, a seat 24 :-is formed in bonnet or cap 15 which-is interposed between the passages 22 and 23 so that the flow of gas therethrough.

, may be closed or shut off by means of a valve 25. Valve 25, as shown, is of cup shape, open at one end and closed at the other. The

closed end is shaped to conform to the seat 24 so that when the valve is seated the flow of gas will be positively shut off.

* Valve 25 includes a plug 26 and a stem 27,

. the stem extending through the plug. The

lug is threaded into the cup shaped memer, as shown, and when in place clamps a head28 of the stem between-the bottom of the cup shaped member and the adjacent end of the plug 26.

The valve bonnet or cap 15 is threaded at its upper end to receive a plug .29 which is drilled to accommodate the stem 27. The plug 29 is provided with a gland 30 in which packing may be disposed, the packing being retained in its proper-position by means of a,

gland nut 31 which is threaded into the plug.

In order that valve 25 may be urged towards its closed position, a compression spring 32 disposed about the valve stem 27 and between valve 25 and plug29, is .provided'. To provide for manually' opening valve 25, so that gas maybe delivered to the pilot light, when it is desired, to light, the same, means are provided for raising the valve off its seat and latching the same in its open position. The means illustrated comprises a member 33 having aslot 34: therein through which valve stem 27 extends. As shown, the upper portion of member 33 is relatively thin and the lower portion relatively thick, the thin and thick portions being connected b an inclined surface 35 which acts as a we ge. The lower end of the member. 33, as viewed in Fig. .1, is provided with a knob that serves as a thumbhold for convenience in opening valve 25. As shown in Fig. 1, the outer end of stem 27 is provided with a nut 36 having an annular flange 37 disposed adjacent to the working surface of member 33.

When member 33 is moved upwardly, as

viewed from F ig. 1, the inclined surface 35 i on member 33 acting as a wedge, moves stem 27 outwardly, that is to the'right as viewed from Fig. 1, and raises the valve 25 from its seat. When member 33 is pushed upwardly as far as it will go, the flanged nut- 36 rests onsurface 38 thereof. Since coil spring 32 is urging valve 25towards its closed position, there will be sufiicient friction between the flanged nut 36 and member 33 to hold the latter inthe position in-which the'lvalve will be held open. The gas or fuel is now flowing to the pilot burner 3 so'that it may be lighted. a

'When-thepilot burner has been buring for a predetermined length of time, thermostatic device 7, which is responsive to the heat developed by the flame" of the pilot burner, comes into action and opens the poppet valve 10 which controls the fiow of gas to the main burner 1. As will be explained subsequently herein, means, are provided whereby when poppet valve 10 has opened a predetermined 3 that, in case thepilot burner is extinguished,

or the fuel supply fails for some reason or other, both valves will be positively closed,

thereby preventing the escape of gas from the- *burners. It is, therefore, necessary in case the pilot burner'goe's out to repeat the above described operations before'the pilot burner can be relighted.

Thermostatic device 7comprises a curvedv bimetallic strip 40 which is disposed inthe distance, poppet valve 25 controlling the flow of gas to the pilot burner 1 will be opened path of the plane of-the pilot burner. '-As shown, the bimetallicstrip is anchored at one end to a support 41, which is threaded on one end of a tubular member 42. Tubular member 42 issthreaded intoa boss 43 formed as an i rod engages the poppet valve 10. When the thermostatic orbimetallic-member-has been i so that in the actionof the thermostatic device, nuts threaded on the end of the rod engaged 45 are by the-bimetallic member'40. The'biinetallic 49 which are adapted to suitable texture; Thelubricant contained in member may bear on a cone-shaped member 46. Thus by turning the nuts towards the end of the rod or towards the support 41, the temperature at which the bimetallic member becomes effective to open valve 10 maybe adjusted or regulated] to some predetermined value.

In order to maintain rod 44-in alinement within the tubular member 42' and also to provide a means for sealing ofi the flow of gas from valve body 8 into the tubular member, a bushing 47 is provided. The bushing embraces rod 44 and is disposed within the end of the tubular-member 42 that engages the valve body. Packing of any suitable form or composition may be disposed at the V end of the tubular member,

a pocket or cavity 48 being-provided in boss 43for this purpose. To further provide against leakage of gas from the valve body into the tubular member, rod 44 is provided with aplurality of grooves contain lubricant of these grooves acts as a seal against the flow of gas along the rod.

' Poppet valve 10 comprises abody portion 51 having a flanged rim 52 for receiving a disc 530i leather or other suitable material.

Disc 53 seats on thevalve seat of the valve body to close the port 9, when the valve is in the position shown in Figure 1. lhe disc 53 may be held in place by means of a washer 54 which is clamped in position by means of athreaded bushing-55 threaded into the body 51. As shown in the drawing, the end of rod 44 that engages. body 5-1\-of valve 10 is taperedfto a point sothat positive engagement between the end of the rod and the end of the valve may beaassured. N

. In order that member 33'may be released to the position shown in Fig. 1, when valve 10 y is opened, so that both valves 10 and 25 may be placed under the control of the thermostatic device 7 valve 25 is provided with a stem 56 which extends through the base. of

,7 the bonnet or cap 15 and terminates short of the valve body 5l of poppet valve 10.- The portion of the bonnet or cap 15 extending into valve body 8 is tapped to accommodate a stufling nut 57 through which"stem 56 passes. Stufiing is interposed between nut 57 and the tappedcavity in bonnetor cap 15 to prevent the flow of gas from the valve body into the ing the rod 44 to the right and opening valve 10. Further travel of rod 44 causes body -51 of valve 10 to engage the end of stem 56 land move valve 25 to the right until member 33 isreleased to the position shown in.

full lines in Fig. 1. Valves 10 and 25 are now under the control o fvthe bimetallic member so that in case the. pilot flame goes out both valves will be closed by the springs associated therewith when the bimetallic member has cooled and assumed the position indi-\ cated in Fig. 1. v v

To relight the pilot'light, member 33 is pushed upwardly to the position indicated in broken lines in which its position is held between the flangednut 36 and the stuffing l nut 31. Member 33 thus acts as a latch to hold the pilot valve open so that it is not necessary for the 'operator'to manuallyhold the pilot valve open until the maiii burner vber. lhus the multiple valve embodies a manually operable valve which may be man; ually opened and heldin its open position by means of a latch and a mainburner valve which'is actuated by a thermostatic device energized by the heat developed by the pilot burner. The arrangement of the valve and the thermostatic device is 'suchthat when the main burner valve has been opened to a predetermined able pilot valve is unlatched *(that is, the latch is released .to that position in which the valve may be returned to its closed position when the main burner valve is closed), whereby both 'valves are placed under thermostatic control, that is, under the control of thermostatic device 7.

It will be apparent that by the form of construction of the valve, the pilot light may be lighted before the gas or fuel is turned on to the main burner, thusavoiding'possible danger of explosions which might occur should the gas be turned on to the mainv burner at the same time thatQit isturned oh to the pilot burner." I a Thus the pilot burner, valve may be actuated to its open position independently ot the main burner valveand it may be held in such open position by a mechanicalflatch pilot valve; the moment that the main burner valve has openedto a predetermined position.

ile various modifications and changes may be made infthe device herein disclosed which is automatically tripped free of the valve has been opened by the bimetallic mem-.

cal

position, the manually 6 erwithout depart'rng from the spirit or the scope of the invention, it 'is to be understood that onlysuch limitations shall be placed on the invention as are imposed by the prior art and the appended claims. What I claim as new and desire to secure by Letters Patent is:

1. In combination with a pilot burner and a main burner, of a valve disposed to control the flow of fuel. to the pilot burner, a valve disposed to control the flow of fuel to the main burner, means for manually opening said pilot burner valve and holding said the flow of fuel to the pilot burner, a valve disposed to control the flow of fuel to the main burner, means for manually opening said pilot burner valveand holding the same open, and means responsive to the heat developed by said pilot burner for opening the main burner valve, releasing the pilot burnor valve holding means and holdin both of said valves open while the pilot urner is; burning, said heat responsive means being arranged to close both of said valves in response to the eXt-inguishment of said pilot burner, I

3. The combination with a source of supply of fuel, a pilot burner and a main burner, ota valve disposed to control the flow of fuel'to the main burner,'a; valve disposed to controlthe flow of gas from-said" source to saidpilot burner, means-for manually openmeans.

ing said pilot burner valve including a latch for holding said valve open, and meansresponsive to the heat developed by said pilot burner for opening said main burner, releasin said latch and placing both of said valves un der the control of said heat responsive 4., In combination, a "pilot burner, a main burner, a valve for controlling the flow of fuel er valve, and means coacting with said main burner and pilot burner valves arranged to release said holding means and place both of said valves under the control of said heat responsive means. I p

6; The combination .with a pilot burner, a main burner, and a source of supply of fuel for said burner,'of a valve, for controlling the flow of fuel to said pilot burner, a valve for controlling the flow of fuel to said main increase the opening of said piloti burner I valve in responseto the opening of said main burner valve for releasing said pilot valve holding means and placingboth of said valves under the control oi said heat. responv sive means.

Intestimony whereof, I have hereunto'sub scribed my name this 16th day of February, 1932.

from a source of supply to the -pilot burner, a valve for controlling the flow of fuelfrom said source to'the main burner, means for holding said pilotvalve open, andmeans responsive to the heat'developed by the pilot burner for opening saidmain burner valve,

said'heat responsive means, after the main burner valve has been opened, being operable to cause both valves to closein case the flame at the pilot burner becomes extinguished 5. Incombinatiomla pilot burner, a main burner, -a valve for controlling the flow of fuelfrom a source of supply to the pilot burner, a valve for controlling the flow of fuel from said source to the main burner, means for holding said pilot valve open,

the pilot burner-for opening said main burnmeans responsive to the heat developed by I ERNEST J. HORTON.

Images