USRE21698E - Multipilot controlled valve - Google Patents

Description

Jan. 21, 1941. H. A. MANTz MULTIPII-JOT CONTROLLED VALVE Original Filed Sept. lO, ,1954

www 'y Reuma Jan. 21, y"1941,

PATENT VOFFICE MULTIPILOT CONTBOLLED VALVE Harold A. Mantz, Milwaukee, Wis., asslgnor to Milwaukee Gas Specialty Company, Milwaukee, Wis., a corporation of Wisconsin Original No.

2,045,664, dated June 30, 1936, Se-

rial No. 743,381, September 10, 1934. Application for reissue August 9, 1937, Serial No. 158,173

7 claims. (cl. 15s-'1111) This invention relates to safety valves,A and more particularly to a multi-pilot controlled safety valve which is maintained in open position only when each of a plurality of pilot burners is ignited, and which is snapped to closed position upon extinguishment of any one of the pilot burners. l

In the provision of automatically operable safety valves for domestic gas ranges and the like.

in which there may be two or more separate and independentpilot burners, such as, for example,

the pilot lburner for the open top or cooking burners, and the pilot burner for the oven burner, it is desirable to have the safety valve close o the fuel supply to all the lburners upon extinguishment of either or both of the pilot burners.

The same conditionexists in the use of any heating installation in which more than one pilot burner is employed.

-The preferred embodiment of vrriy invention l provides a safety valve` structure of this type,

which is controlled by the expansion and contraction of a Sylphon-type bellows, the movement of the bellows being produced by the heating and cooling of Afluid pressure chambers connected in series and positioned adjacent the respective pilot burners. The movement of the safety valve is controlled by a spring member of disc-like form,

which is manually operable to provide for resetting of the valve independently of the restraining pressure responsive means, if such action is desirable.

'Ihe bellows structure and the pressure-restraining spring disc are `so calibrated that all of the pilot burners must be ignited to develop sumcient pressure'l to open the valve against the restraining spring member; and the extinguishment of any of the pilot burners will produce a. suillcient cooling in the associated pressure chamber to allow a decrease of pressure sufficient so that the valve will close under the spring pressure.

The primary object of the present invention is the provision of a safety valve of this type under the control of a plurality of pilot burners or lgniters which are separately positioned with respect to the appliance, whereby the valve will be' automatically closed upon extinguishment of any one of the pilot burners.

Another object of -the present invention is the provision of a neat, compact and positively operatlng control system for a safety valve of this 'f A distinctly desirable advantage secured by the present invention is the provision of adjusting means for varying the effective pressure of the spring disc member upon the valve member, and adjusting means for varying the 'position of the to the valve seat and spring.

bellows or pressure responsive means with respect Other objects and advantages of the present invention will appear more fully from the following detailed description, which, taken in conjunction with the accompanying drawing, will disclose to those skilled in the art the particular construction and operation of a preferred form of the invention.-

In the drawing:

Figure 1 is a perspective view o'f a. common type of domestic gas range provided with the safety control means of the present invention; and

Figure 2 is a vertical sectional view of the l safety valve member, with the individual pressure responsive means for each of the pilot burners diagrammatically shown in connected position.

Referring now in detail to the drawing, in Figure 1 lthe domestic gas range is indicated in its entirety by the reference numeral E, and comprises the burner or cooking compartment 6 and the oven compartment 1. The cooking com partment 6 includes a plurality of open top or cooking burners B, which are supplied with fuel from a` fuel supply conduit 9 leading to the gas manifold I0 extending across the front of the range.

Disposed between the fuel supply conduit 9 and the manifold I0 is the safety valve indicated generally at II.

An oven burner, shown diagrammatically in lFigure 1 at 13, is also connected to receive its fuel ,supply from the gas manifold Ill.

Suitable control valves, indicated a't I4, are provided for the'puipose of controlling the operation of the burners B.

. The burners 8 are 'disposed in spaced relation o to. a 'central pilot burner indicated generally at I5, and which is provided with radiating tubes leading to the burners for igniting thesame upon admissionv of gas to the burners. In addition, a pilot burner I5' is also connected toreceive fuel from the manifold III and to support.

a pilot flame'adjacent the oven burner I3. These pilot burners may be .of any well knownform. 'I'he valve member I6 is provided for the purpose of controlling the flow of fuelv to the oven burner I3. A

Adjacent the pilot burner I5 and the oven pilot burner I5' is a fluid pressure cylinder, thepressure cylinder for the pilot burner I5 being indicated at 2Il'and the pressure chamber for the pilot burner `I 5 for the oven being indicated at 22.

The ,pressure chamber 22 is connected, through the exible metallic tubing 23, to the pressure chamber 2,0. and the `pressure chamber 20 is connected through the flexible metallic tubing 2l 'to the control valve I I, passing outwardly through -is provided with the inlet chamber 32 and the outlet chamber 33 separated by the partition wall 34. The partition wall 54 is provided with an annularly extending recess forming a shoul` der 35 providing an annular valve seat through which fuel is adapted to now from the chamber 32 to the chamber 53.

A suitable valve member 35, provided with a valve seating portion 31 formed of leather, ilber or other suitable material, is mounted upon an integral valve stem 35 which is supported for reclprocatory movement in a boss 35 formed'in` tegral with the valve body 35. The member 35 is adapted to have valve seating engagement with 'the valve seat 35, to control the ow of fuel from the chamber 52 to the chamber 35.

The lower end of the valve' stem 35 is secured to the upper end 42 of a Sylphon bellows member indicated generally at 43, and which is provided at its lower end, indicated at 44, with an adjustable screw member 45, which is hollow, and is adapted to receive the extending end of the ilexible tubing 24, the tubing being sealed therein or otherwise secured thereto.l

The bellows 43, which, although I have shown it in the form of a Sylphon bellows, may be any type of pressure actuated member capable of effecting reciprocatory movement of the valve stem 35, is enclosed within a cylindrical offset portion 45 of the valve body 35, and is enclosed within the recess 45 by the cap member 41, which has threaded engagement therewith, and which,

in addition, is providedwith a threaded interior portion receiving the threaded adjusting screw 45. By this means, upon rotation of the adjustingscrew 45, the bellows 43 is shifted axially with respect to the chamber 45 to provide for! adjustment of the valve member 35 with respecteto the valve seat 55. A locking nut, indicated at 55, is provided for locking the screw 45 in ad-l justed position, and is provided with an extending cylindrical portion 52 serving as a support for the end of the exible tubing 24, to guide it into engagement with the member 45, and to prevent angular movement of the tubing with respect to the adjusting screw 45 tending to break the fluid pressure connection therebetween.

The valve body 35 is also provided with a valve cap 53, having threaded engagement therewith, there being a gasket 54 interposed therebetween to prevent gas leakage. The cap 53 is provided with an upwardly extending boss portion 55 adapted to form a bearing for the reset control stem 55, which extends through the valve cap 55 and is provided with an operating cap or button 51 adapted to be manually gripped for manual resetting of the valve.

I'he valve cap 53 is provided with an annular shoulder 55 against which the outer peripheral edge of a spring disc member 55 is adapted to able with reciprocation of the stem 55. The disc 53 is secured, at its outer edge, about the outwardly extending e cylindrlcally ilanged portion of the valve cap 53 by means of the packing disc,

ring 54,. which is press-fitted into engagement to secure the packing disc 53 in position.' This effectively seals the recessed portion of the chamber 53 against entrance of gas from the inlet chamber 52 of the valve. Y

Threaded into the lower end of the stem 55 is an adjusting screw 55, which is provided with a lock nut l for securing the screw 55 in adjusted 5 position with respect to the stem 55. The screw 55 is adjusted to have seating engagement in the upper surface of the valve member 35, there being a suitably recessed depression formed therein4 providing for seating of the head end of the screw 55 therein.

In vthe operation of the valvel disclosed, the valve member is normally maintained in closed position by the 'spring pressure of the spring disc 55 bearing against collar 55, and thus bearing againstv the ilange 52 urging the reset stem 55 downwardly, to hold the valve member 35 in valve closing position. Any suitable gas, such as air, or other gas having a relatively high coefficient of expansion, is confined within the bellows 45, the tubing 24, the tubing 25 and the uid pressure chambers 25 and 22. This conned gas system is sealed against leakage or the entrance of outside air, and comprisesa sealed yuicl pressure system. When the pilot burnerswsuch as the burners I5 and I5', are ignited, the fluid in the chambers 25 and 22 expands due to thel heating of 4these chambers by the pilot flame. This results in an increase of-pressure in the tubing 24, which results in an increase in pressure in the exible bellows 43. 'Ihis increase of pressure tends to elongate the bellows, producing an upward stress upon the valve stem 35. 'I'his stress is'counteracted by the resiliency of the springI disc 55, but when the pressure reaches a predetermined point, determined by the setting of the pilot burners, the spring disc is moved upwardly, and the valve member is thus opened under this pressure. The eiTective pressure developed by the heating -of chambers 25 and 22, is so calibrated that thevalve member will be raised from its seat against fthe -spring pressure disc 55 only when all of the pilot burners are ignited and the chambers 25 and 22 are being heated. Thus, if either of the 45 pilot burners is extinguished, the corresponding chamber is cooled and results in a decrease in pressure, 'so that the pressure and, consequently, the elongation of the bellows 43 is decreased, allowing the vspring disc 55 to force the valve mem- 50 ber downwardly into closed position. By adjustment of the screw 55, the eective pressure of the 'spring disc 55 upon the valve member 55 may be varied, and by adjustment of the screw to raise the valve member from its controlled.

If it is desiredto operate the valve without restraint, such (as for resetting the valve in open position to reignite the pilot burners, the reset stem is pulled upwardly, snapping' the spring disc 55 upwardly, and thus releasing engagement between the adjusting screw 55 andthe valve member 35, allowing free movement of the valve member directly under the inuence of the pres- 55 sure in chambers zo and 2z. Thus, upon slight heating of either of these chambers, the valve will open, providing for flow of fuel to reignite the pilot burners. A It is to be understood that the uid pressure 70 chamber. such as chambers 2 5 and 22, may be multiplied4where there are more than two pilot burners in the installation, and in such case the calibration is changed so that it is necessary for all of the pilot burners to be. ignited in order to 7| seat may be may also be connected either for series or parallel operation. y

Inasmuch as the system is capable of adiustment to accommodate more or less pilot burners and associated pressure chambers, I do no t intend to be limited to theconstruction' which I have shown and described, but only insofar as denned by the scope and spirit of the appended claims.

I claim:

1. In a domestic gas range, a cooking compartment, an oven compartment, pilot burners in each of said compartments,`a mainffuel supply conduit terminating in a manifold extending into said cooking compartment, a valve in said conduit anterior to said manifold, means normally biasing said valve to closed position, expansible pressure responsive means carried by said valve for opening the same against said biasing means upon increase in pressure therein, and serially connected thermally sensitive means adjacent each of said pilot burners providing for increase of pressure in said pressure responsive means to open said valve only during ignition of both of said pilot burners, and means operative to render said biasing means inoperative whereby said valve is responsive solely to variations in pressure within said pressure responsive means.

2. In combination, a fuel supply conduit, a

valve in said conduit including a valve body, a'

valve member reciprocal therein for 'opening and closing said valve, a spring disc normally biasing said valve member toward closedl position, pressure responsive means carried by said valve body adapted to move said member toward' open position, a pair of remotely disposed separate ame supporting means, means associated with each of said flame means-and responsive to the h eat thereof for actuating said pressure responsive means, the heat of one of said ame means alone being insuillcient to produce actuation of said valve member to open position against the pressure of said spring disc, and means operative to render the bias of said disc inoperative with respect to said valve member whereby the heat of one of said name means is sufllcient to produce opening of said valve member by said pres.

sure responsive means.

3. In combination, a valve housing having a valve seat therein, a valve member on said seat, pressure-responsive means operative to open said valve member, a reset stem in said housing, means carried by said stem engaging said valve member, spring means normally biasing said en- .gaging means into position to' maintain said valve member 4on said seat, said reset stem being operative to render said biasing means inoper- ,ative, and a plurality of pressure-developing means remote from said housing and having common communication with said pressure-responsive means whereby all of/ said last-named means together are capable of raising said valve member from said seat against said biasing means, any one of said pressure-developing means being capable of developing sufllcient pressure to raise said valve member from said seat when said biasing means has been rendered inoperative.

4. In combination, a valve comprising a valve housing, a valve member therein having reciprocatory movement for opening and closing said valve, means normally biasing said valve member to closed position, means operative to render said biasing means inoperative, pressure-actuated means operative to open said valve member, a plurality of thermally responsive pressure means serially connected together and communicating with said pressure-actuated means, all of said pressure means when operating together being capable of opening said valve member against said biasing means,l and anyone of said pressure means alone being capable of opening said valve member when said biasing means is rendered inoperative.

5. In a domestic gas range, a cooking compartment, an oven compartment, pilot burners ineach of said compartments, a main fuel supply conduit -terminating in a manifold extending into said cookingcompartment, a valve in said conduit` anterior to said manifold, means normally biasing said valve to closed position, expansible pressurefresponsive means asso- 'pressure responsive means independently of the biasing action 'of said biasing means.

6. In combination, a valve housing having a valve seat therein, a valve member cooperable with said seat, pressureresponsive means operative to hold said valve member in open position, a reset stem in said housing, means carried by said reset stem and engaging said valve member, spring means normally biasing said engaging means into position to maintain said valve member on said seat, said reset stem being operative to render said biasing means inoperative, and a plurality of pressure developing means remote from said housing and having common communication with said A pressure responsive means and arranged so that all of said last named means together are capable of holding said valve member away from said seat against said biasing means, any one .of said pressure developing means being capable of developing sutlicient pressure to move said valve member from.

said seat when said biasing means has been rendered inoperative.

7. In combination, a valve comprising a valve housing, a valve member therein having reciprocatory movement for opening and closing said valve, means normally biasing said valve member to closed position, means operative to render said biasing means inoperative, pressure actuated means operative to hold said val've member in open position, a plurality of thermally responsive means communicating with said pressure actuated means, all of said thermally responsive pressure means when operating together being capable of holding said valve member open against said blasing means and any one of said thermally responsive pressure means alone being capable of opening said valve member when said biasing means is rendered inoperative. l

HAROLD A. MANTL.

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