US2506403A

US2506403A - Witzel

Info

Publication number: US2506403A
Authority: US
Publication date: 1950-05-02
Anticipated expiration: 1967-05-02

Description

E. wlTzEl.

May 2, l195() 'BURNER GONTROL SYSTEM AND CONTROL IIEANS THEREFOR Filed Feb. 9. 1948 2 Sheets-Sheet 2 www. L \NNN| @N AQNNI T Duw www H/.v 1mm, m, N. ANN. @"ull 'l 0 QN S mm] Y @j .QQ R. um

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Patented May:` 2, 1950 2,506,403 BURNER CONTROL SYSTEM AND CONTROL MEANS THEREFOB Ernst Witxel, Milwaukee, Wis., assignor to Milwaukee. Gas Specialty Company,-Milwaukee, Wis., a corporation ol Wisconsin Application February s, 194s, serai Nn. un

1s claim.. (ol. 15s-111.1)

This invention relates to a burner control system and control means for such system.

While 'the particular embodiments of the invention which I shall describe hereinafter in connection with the drawings are systems adapted for use with domestic gas ranges, it is to be understood that the invention is not limited to such use. but may be employed for all similar purposes; y

for example, inl connection with various commercial forms of apparatus having a baking oven burner, broiler oven burner' or other burner remotely located'relative tothe pilot burner.

In the usual domestic gas range, the pilot burner is in the form of a single, constantly burning pilot burner located in juxtaposition to the top burners at the upper part of the range, and the baking oven, broiler, or like burners are located in the lower part of the range. Although the top burners are usually provided with a constantly'burning pilot burner for lighting the same, a match has usually been employed for lighting the baking oven, broiler, or like burners. The stooping and hazards of lighting an oven burner or the like with a match are well known in the art.

In my copending applications, Serial No. 738,412, illed March 31, 1947, and Serial No. 744,905, filed April 30, 1947, I provide an improved system of ilash tubes and intermediate pilot burner meansvfor assuring ignition of a pilot burner in juxtaposition to the oven or like burnery from a' constantly burning top pilot burner; also an improved system wherein means is provided for extinguishing the intermediate pilot burner means and establishing a ilow of fuell to the oven or like burner after a time delay following ignition of the pilot burner for the main burner, and

an improved thermoelectric control device andl other instrumentalities are provided for accomplishing the new and advan geous results therein set forth.

One of the main objects of the present invention is to provide a simple, improved and effective system and means which will provide all of the advantageous results obtained witlpthe systems disclosed and claimed in my above identified co' pending applications but without the time delay mechanism for establishing a time delay between ignition of the pilot burner for themain burner and establishment of-a flow of fuelI to the main burner.

Another object of the invention is to provide an improved system of the character described in which the diaphragm or equivalent means at the thermoelectric control valve, instead of being exposed to the deleterious chemicals therein at all times, gas only when the gas cock or means is open.

Another object of the invention is to provide an is exposed to the othengas shut-oi! -improved system of the character ,described which may be used with only one pilot burner instead of a plurality of pilot burners at the thermoelectric generator heating position, although not j limited -to such use.

Another object of the invention is to provide an improved system of the character described in which trouble free mechanism is provided for accomplishing the desired results. Another object of the invention is to provide an improved form of automatic or thermoelectric control valve having various features of novelty land advantages, and which is characterized by its simplicity in construction, its economy in manufacture and installation, and its effectiveness in use; also a valve of this sort having a diaphragm or equivalent means with provision for exposing such diaphragm or equivalent means to the gas only when the gas cock or other shut-oir means is open.

Anotherlobject of the invention is to provide an improved system embodying a bleed port control, and, more particularly, a system of this sort wherein the automatic or thermoelectric control valve does not require special seals or the like.

Further objects and advantages of the invention will appear from the following detailed description, taken in connection with the accompanying drawings which illustrate the manner of constructing aand operating illustrative embodiments of the invention.

In the drawings:

Figure 1 is a diagrammatic view showing a system embodying the present invention, with the thermoelectric control valve in section; and

Figure 2 is a similar View showing another system embodying the present invention; also with the thermoelectric control valve in section.

Referring first to the embodiment of the invention shown in Figure 1, the burner l is the baking oven, broiler, or other remote burner. It is usually located in the lower part of the range or other appliance. f

The pilot burner 2 is the constantly burning pilot burner. It may be, for example, the top pilot burner for the top burners of a gas range or other constantly burning pilot burner. lThe pilot burner 2 is usually located in the upper part of the appliance.

A fuel supply pipe 3 leads, for example, from action of the gas and 5I gas manifold I to pilot burner 2 for the delivery embodiment cock 1 are connected by suitable linkage shown bining of the valve spaced laterally from the oven 4to.Y Internally the valve body valve, is in the form of of gaseous fuel thereto. The iiow of fuel to the burner I is controlled by an automatic or thermoelectric control valve l and by a thermostat controlled valve 9 and a gas'cock 1 or other gas shut-oi! means. The thermostat controlled valvelmaybeofanytypewellknownintheart, and therefore will not be described in detail except to state that it operates under the action of a thermostat to place the fuel supply pipe 9, leading from the outlet 9 of the thermoelectric control valve l, in communication with fuel supply pipe Il leading to the burner I and to shut of! communication between these pipes. The pipe Il is shown as adapted to supply the gaseous fue! to burner I through a mixing chamber to which air is admitted through adjustable air inlets (not shown), as weil understood 'in the art.

The gas cock 1 may also be any type well known in the art, and therefore, likewise, will 'not be described in detail, exc pt to state that it is operable, for example, 1n'V ually to place fuel supply pipe II. leading from manifold 4 to cock 1, in communication( with a fuel supply pipe I2 which leads from the cock 1 and tol shut off communication between these pipes. In the illustrated of the` invention, the valve 5 and comprising meshed toothed sectors I3 and I4. The form of linkage connection may vary, and com- 9 and cock 1 into a single device is contemplated within the scope of the present invention'. 3 The oven or like burner I is provided with an oven or like pilot burner 'I5 for igniting it. A flash tube Il has a laterally turned upper end opening directly to the constantly burning pilot burner 2. This tube I9 extends downwardly and opens at its lower end to an intermediate pilot burner I1. The intermediate pilot burner I1 is pilot burner I5, and the tube II has, at its lower end, a generally horizontally extending branch Il which opens at its-outer end to the oven pilot burner I5. An auxiliary or standby pilot burner I9 is also provided in lighting proximity to the burner I for a purpose which will hereinafter appear.

The thermoelectric control valve 5 comprises a valve body formed of top and bottom valve body parts 2l and 2I clamped together by screws -or other suitable means (not shown) with adiaphragm 22 therebetween. The valve body part 2l has an inlet 23 and the outlet 9. A fuel supply pipe 24 leads from manifold 4 to the inlet 22 for the delivery of gaseous or other fuel therepart 29 has a generally L-shaped outlet chamber 25 having a longitudinally extending part in open communication with the outlet 9 and a transversely extending portion defined by a cylindrical wall 29. An inlet chamber 21, in open communication with the inlet 23. a generally annular-shaped portion which embraces the cylindrical wall 25.

The wall' 29 terminates in an annular valve seat 21'. An armature 2l, of disc-like form, has a yielding or other suitable valve or valve facing 29 adapted to seat against the seat 21' to shut off the now of gas from inlet 23 to outlet 9 through the chamber 25. A hood 30 is clamped to the valve body part 25 by a union nut 3i, and ipreferably with a hood gasket 32 therebetween.

In the illustrated embodiment of the invention, the means for operating the valve 29, and, moreL particularly, the means for opening this an electromagnet comterminates at its inner end in' prising a, magnet frame or coil spool 99 and a coil 94. One side of the coil 94 is connected-by. a lead 25 to one side of a shown in the form of a thermopile 2l, although it may be in the form of va thermocouple or other suitable thermoelectric generator. The other side of the coil 94 is connected by a lead 21 to the other side of the thermoelectric generator 25,

although I contemplate grounding one side of lside of the thermoelectricv the coil 24 and one :generator where suitable land appropriate.

`the electromagnet by heating In the illustrated embodiment of the invention, the electromagnet has a ilux shell 28 and a spacer ring 99. The lower end of the coil spool Il has an axial recess, and disposed in this recess and interposed between spool 99 and armature 2l is a coiled spring 40 which operates to move the armature 29 to retracted position and to seat the valve 29 on valve seat 21' when the electromagnet is deenergized. Energization of of the hot junctio of the thermopile 25 is suillcient to lift the valve 29 to open position against the action of the spring 49. A hood spring 4I, interposed between the top of the spool 22 and hood 2li, seats the shell 29 in the valve body part 20 at 4I.

LThe bottom of the valve body part 29 hasta recess 42 spaced inwardly from its periphery. The pipe I2 connects with a leads to pilot burner I5 for supplying gaseous fuel thereto, and with another branch pipe 44 which leads to a chamber. which may, for example, be'cored in the valve body part 20. A port 45 opens from the chamber 45 into chamber 41 above the diaphragm 22.

The valve body part 20 has a pilot outlet passage 49 for supplying fuel tothe intermediate pilot burner I1 through a pipe 49. Fuel is adapt- 'diaphragm and 41 to the passage 48' through a passage 50, the lowerend of which is surrounded by an annular valve seat 5I. A valve or valve facing member 52 is adapted to seat against seat 5I to shut oif the supply of fuel to the intermediate pilot burner I1. The'auxiliary or standby pilot burner I9 is supplied with fuel by a. pipe 53 leading from the pipe 8, or otherwise from the outlet of the thermoelectric control valve 5.

Valve or valve facing 52, which is of disc-like form, is secured to the diaphragm 22 at the axis thereof. The diaphragm 22 may have diaphragm plates, and interposed between the bottom of this valve body part or cover plate 2I is a coiled spring 54. The Apart 2l has an axially disposed cup-shaped part 55 for accommodating the spring 54. A port 56 opens from the outlet chamber 25 and through a port 51 into the chamber 58 beneath the diaphragm 22.

The operation of the system shown in Figure 1 is as follows:

When the thermostat valve and gas cock combination is opened, gas will flow through the pipes II and I2 and branch off through pipe 43 to supply fuel to the burner pilot burner I5. At the same time the other branch pipe 44 supplies gas through chamber 45 and port 46 to the top of the diaphragm 22, and thereby opens the valve 52 and supplies fuel through the passage 50, outlet passage 48, and pipe 49 to the intermediate pilot burner I1.

The gas from the intermediate and pilot burners I1 and I5 rises in the tube I5 which is always thermoelectric generator branch pipe 49 which' amaca dashes back to lis-ht the intermediate andfpllot burners I1 and I5. The turning of the upper end of the iiash tube I5 laterally toward the pilot burner 2 reduces the possibility of extinguishing this pilot by ilash back action in the tube I5.'

The thermopile or other thermoelectric generator 55 is now heated by the pilot burner I5, and energizes the electromagnet 55, 25, which, after a given time, will lift the amature 25 and, with it, valve 25, thereby opening the valve 25. Gas will now flow through the

pipes

25 and 5, thermostat valve 5, and pipe I to the burner I; also through the pipe 55 tothe auxiliary or standby pilot burner I5. As soon as the automatic valve 5 opens, gas passes to the underI side of the' diaphragm 22 through

ports

56 and 51, and balances the pressure on opposite sidesof the diaphragm.

` The spring 55 will now close valve l2, thereby s A fuel hereto- The gas cock 51 is shown in closed position and is turned counterclockwise in the direction of the arrow to open position. Suitable passages (not shown) are provided in the gas cock 51 for delivering fuel fromithe inlet of the cock through the ports I5 and 15, and thereby to the pipes 1| and "when the gas cock is open.

The ash tube I1 has a laterally turned upper end opening to the constantly burning pilot burner 55. This tube extends downwardly and opens directly over a flash tube pilot burner in lightshutting oi! thesupply of gas to the intermediate pilot burner I1, which permits ilash tube I5 to cool for the succeeding starting operation.

When the thermostat-gasv cock 5, I isl closed,

the gas supply to the burner I is definitely shut oir: also the gas supply to the pilot burners II and I5. However, sas can still pass through the pipe 25, valve 5, and pipe 55 to the auxiliary or standby pilot burner I5 which will remain lighted as long as the valve 5 is open, which depends on the cooling rate of the thermoelectric generator 55. vWhen finally the amature is released from the electromasnet 3l, fthe valve member 29 moves to closed position against valve seat 21 and shuts oi! the supply of Vfuel to the auxiliary or standby pilot burner I5.

It is an important feature that the pilot burner I5 is standing by and maintains a pilot flame for lighting the burner I as long as the automatic valve 5 is open. In case the thermostat-gas cock 5, I is turned on before the thermoelectric generator 25 has cooled sumciently to close the valve 5, gas passing to the burner I will ignite from the standby pilot burner I5; the intermediate pilot I'I being shut oi! or inoperative to produce lig-hting oi the burner I as long as the valve 5 is open.

The present invention provides for accomplishing the results set forth without exposing the diaphragm 22 to gas at all times, which is objectionable because oi' the deleterious eifect of the gas and chemicals therein on the diaphragm material. Instead of being exposed to the gas atv all times, the diaphragm 22 is exposed to the gas only when the gas cock 'l or other shut-oi! means is open. The possibility of developing leaks and failure of the systemare thereby reduced.

The structure and operation of the automatic or thermoeleotric control valve 5 are also important aspects yof the present invention.

As usual, the safety shut-ofi' feature is present. If the pilot burner I 5 should fail, the vthermoelectric generator 35 will cool and the valve member 25 will operate to closed position.

In the system shown in Figure 2, the burner and constantly burning pilot burner shown diagrammatically at correspond with the burner I and constantly burning .pilot burner 2 of the preceding embodiment of the invention.

65 and has a port 'I0 for delivering gaseous fuel to a pipe 1I leading tothe inlet 'I2 of the lautomatic or thermoelectric control valve 15;.and a second port 'I5 for delivering fuel to a pipe 15 leading to a pilot burner 15 for supplying gaseous ing proximity to theburner 55. 'I'he auxiliary or standby pilot burnerA 'I5 is also in lighting proximity to the burner 55. Y

The automatic or thermoelectric control valve I5 comprises a valve body formed of top and bottom valve body parts 55 and 5|, clamped .to-

gether as suitable or desired, with a diaphragm 52 therebetween. The valve body part 5I Vhas the inlet l2 and an outlet 55.- The outlet 551s adapted to supply gaseous fuel to the bin-ner 55 through a pipe 54. for example, through a mixing vchamber 55 to which air is admitted through adjustable air inlets (not shown).

Within the valve body part 5| thereare chambers 55 and 51 between which there is a passage 55 having valve seats 55 and 55 at the opposite ends thereof. 'I'he inlet |2.of the valve 'I3 opens into the passage 55 intermediate the valve seats 55 and 55 at opposite ends thereof. A pipe or tube 5I `leads from the chamber 55 to the pilot burner 15.

Secured to the diaphragm 52 at the axis thereof is a,valve stem 54 having a valve or yielding facing 55 adapted to seat against the seat 55 to shut oi! the supply of fuel to the pilot burner 15. 'Ihe valve stem 55 also carries a second valve or yielding valve facing 55 adapted to seat against the s eat 55 to shut oir the supply of fuel to the burner 55.

The bleed port control comprises abody 'part 51 mounted, for example, on the valve body part 55 and provided withy a chamber 55. A pipe 55, leading from the pipe 55 or, if desired, from the gas cock 51, is adapted'to deliverl gaseous fuel` fuel vented through the port |52 is preferably delivered through a pipe |03 to position adjacent to the burner 55 where it is burned. 'I'he ports 55' and |02 are controlled by valve members I 55 and |05 carried 'by a generally T-shaped arm |55 pivoted at I01.

In the illustrated embodiment of the invention the means for operating the arm |55, and thereb'y the valves |54 and |55, is in the fonn of an electromagnet comprising a magnet frame |55 and a coll |05. One side of the coil |55 is connected by a lead I5 to one side of the thermoelectric generator 53. The other side of the coil |55 is connected by alead III to the other side of the thermoelectric generator 55. As before, I contemplate grounding one side of the coil |55 and one side of the thermoelectric generator 55 and omitting one of the leads |I5 or III where suitable and appropriate.

The amature H2 is carried by an arm III pivotally mounted at one end at H5. The opposite end of the arm IIB is connected by a link |I5 with the outwardly extending arm II5 oi' the arm or lever |05. A spring Ill, connected, for example, between the arm I5 andv the body counterclockwise armature to retracted position to close valve |88 1 part 81, is adapted to actuatethe arm |`l8 in a direction and thereby the and open valve ill. The connections of the arms ||8 and ||8 with the opposite ends of the link ||8 are, of course, such asV to permit the desired action.

With the mechanism in the position shown in Figure 2, the operation of this form of system is as follows:

When the gas cock 91 is opened, gas will flow .through the port 'Il and pipe 'Il t0 inlet '12 of valve 18 and into the passage 88. Valve 98 being closed, there is no flow of gas to the burner Il, but valve 9| being held open by spring 98', gas flows into the chamber 80 andout through the pipe 9i to the pilot burner 18. Pilot burner 18 ignites from the top pilot burner 00 by means of the flash tube 11. At the same time, gas flows through the port 18 and pipe 1I to the pilot burner 18 which ignites from pilot burner 18.

' The thermoelectric generator 98 is now heated by the pilot burner 18 and energizes electromagnet |88, |09 which, after a given time, will move the armature ||2 to attracted position, swinging arm ||8 in a clockwise direction and also swinging arm |08 in a` clockwise direction to open valve |84 and close vent valve |00. Gas will now ilow through pipe 99 and port 99' into chamber 98, and from' chamber 90 through port |88 into chamber lli. The action of the gas pressure in chamber on the large area of the diaphragm 82 flexes the diaphragm downwardly, thereby closing valve 95 and opening valve 90. As soon as valve 99 opens, gas passes to the burner 05 which is ignited by the adjacent pilot. As gas enters the chamber |0| it is delivered through a tube or pipe |8 to the auxiliary or standby'pilot burner 19 which ignites. When the valve 9i closes, it shuts off the gas supply m to the pilot burner 10.

When the gas cock 01 is closed the gas supply to the burner 05 is definitely shut off; also the gas supply to the pilot burner 19 is shut off. However, gas can still. pass through pipe 99, port 98', chamber 88, port |00, chamber |0| and pipe ||8 to the auxiliary or standby pilot burner 19 which will remain lighted as long as the valve |88 is open and vent valve |05 is closed, which depends on the cooling rate of the thermoelectric generator 98. When finally the armature |I2 is released from the electromagnet |08, |99, the valve member |08 closes and vent valve |00 opens under the action of thespring ||1. This shuts of! the supply of fuel to the auxiliary or standby pilot burner. The gas in chamber 98 escapes through the pipe |83 and may be burned by the flame. for example, at pilot burner 19 which will remain lighted until the gas in chamber |0| is exhausted.

The embodiment of the invention shown in Figure 2 provides the advantageous results set forth in more detail in connection with the Preceding embodiment of the invention.

Many other variations and adaptations of the 08 systems and devices selected for illustration are contemplated within the scope of the present invention. `Therefore the embodiments of the invention shown in the drawings are for illustrative purposes only, and it is to be expressly understood that the drawings and the accompanying specications are not to be constructed as a deflnition of the limits or scope of the invention, reference being had to the appended claims for that purpose.

8 I claim: i. In apparatus of the class described. in oombination, a thermoelectric control device having a fuel inlet and a fuel outlet, a first valve mem- 5 ber for shutting olf communication between said inlet and said outlet, said control device having a valve body provided with a pair of chambers separated by a diaphragm. a pilot fuel outlet means on one side Voi! said diaphragm, a

lo first intermediate pilot burner connected to said pilot fuel outlet, a second constantly burning pilot burner, a main burner remote from said iirst constantly burning pilot burner, a third pilot burner for igniting said main burner, a

flash tube for igniting said first intermediate pilot burner and said third pilot burner from said second constantly burning pilot burner, a second valve member for controlling said pilot fuel outlet and actuated to open position by 20 said diaphragm, port means for delivering fuel into the chamber on one side of said Ydiaphragm independently of the fuel inlet of the valve body for actuating said diaphragm in a direction to open the valve member for the pilot outlet when said first valve member is closed, port means for delivering fuel into the chamber on the opposite side of the .diaphragm to equalize the fuel pressure in the chambers `on opposite sides of the diaphragm when said first valve member is open, means for actuating said diaphragm in a direction to close said second valve member upon I equalization of pressure upon opposite sides of the diaphragm, and a standby pilot burner in juxtaposition to the burner and connected to 5 the fuel outlet of the valve body of said thermoelectric valve.

2. Apparatus according to claim 1 wherein there is a fuel supply line leading to the port means for delivering fuel into the chamber on one side of the diaphragm independently of the fuel inlet of the thermoelectric control device, and fuel shut-off means in said fuel supply line anterior of said port means.

lEl. Apparatus according to claim l where there is a fuel supply line leading to the port s means for delivering fuel into the chamber on one side of the diaphragm independently of the fuel inlet of the thermoelectric control device; also fuel shut-off means. in said fuel supply line anterior of said port means, and a branch fuel 5 une leading from said last mentioned fuel une to said third pilot burner.

4. Apparatus according to claim 1 wherein there is a fuel supply line leading from the outlet of said thermoelectric control device to the burner'with' a thermostat controlled valve in said last supply line.

5. Apparatus according to claim 1 wherein there is a fuel supply line leading to the port means for delivering fuel into the chamber on one side of the diaphragm independently ci the fuel inlet of the thermoelectric control device, with fuel shut-off means in said fuel supply line' anterior of said port means and wherein there is a fuel supply line leading from the outlet of said thermoelectric control device to the burner, with a thermostat controlled valve in said last fuel supply line. Y

6. In a thermoelectric control device, in combination, a valve body having a fuel inlet and 7 a fuel outlet, said valve body having a passage open to said fuel inlet and having valve seats at its opposite ends. a diaphragm carrying a pairA of valve members, one adapted to seat against one valve seat and the other adapted to. seat against the other valve seat, said valve lbody having a first chamber posterior of one toL claim 6 wherein there is a bleed chamber open-4 ing into said second chamber, with a port opening into' said bleed chamber for delivering fuel into said chamber, a bleed port opening from said bleed chamber to atmosphere, and thermoelectrically controlled valve means controlling saidports. j

8. A thermoelectriccontrol device according to claim 6 wherein there is a bleed chamber opening .intosaid second chamber, with a port opening into said bleed chamber for delivering fuel into said chamber, a bleed port opening from said bleed chamber to atmosphere, thermoelectrically controlled valve means controlling said ports,l said thermoelectrically controlled valve means comprising a pivoted lever having a pair of valve members one for each of said ports, and an electromagnet for actuating said lever to and holding it in position with the valve member for the bleed port closed and the valve member for the other port open. y

9. In a burner control system of the class wherein there is a main burner, pilot burner means for lighting said main burner, said pilot burner means comprising a first pilot burner, a fuel supply line for supplying fuel to said main burner, a fuel supply line for supplying fuel to said first pilot burner, a safety shutoff valve in of fuel to said main burner, valve means in the shutoff valve in the fuel supply line for the main the fuel supply line for the main burner and operable to closed position to shut oil! the supplyv burner is open, whereby to shut off the supply 4 of fuel to said first pilot burner, the combination with said system of stand-by pilot burner means in juxtaposition to the main lburner for relighting said main burner when the safety shutoff valve in the fuel supply line to the main burner is in open position and the valve means in the fuel supply line for said first pilot burner is closed.

burners.

for said second'pilot burner and additional valve means partially in the fuel supply line for the main burner and partially in the fuel supply line for one of the pilot burners, said additional valve means being operable.to closed position simultaneously to shut oil.' the supply of fuel to both the main burner and one of said pilot burners and to open position simultaneously to establish a supply of fuel to said main burner and to one of said pilot burners.

13. A burner control system accordingtoclaim 9 wherein the pilot burner means comprises a second pilot burner and fuel supply means therefor in addition to said flrst pilot burner, wherein the safety shutoff valve in the fuel supply line for the main burner is under the control of an electromagnet connected in circuit with al thermoelectric generator subject to the heat of said second pilot burner, and wherein there is a thermostat controlled valve and a connected gas cock for controlling the supply of fuel to the main burner and to said first and 14. A burner control system according to claim 9 wherein the safety shuto' valve in thel fuel supply line for the main burner comprises a valve body having an outlet port for supplying fuel to said first pilot burner, and wherein there is a fuel supply means for said outlet port and va valve member under the control of the safety shutoff valve for controlling the supply of fuel through said fuel supply means to said port.

15. In a control device of the class described.

in combination, a pilot burner, a valve body having a nrst fuel inlet and a first fuel outlet. a

first valve member for shutting off communication between said inlet and said outlet, said valve body having a first chamber and a second chamber separated by a diaphragm, with said chambers disposed on opposite sides of the diaphragm, said valve body having a second fuel outlet for supplying fuel to said pilot burner, a second' valve member for controlling. said second fuel i outlet and operable to open position by duid -pressure in said first chamber for supply of fuel to said second fuel outlet when said first valve member is closed, said valve body having port means for delivering fuel into said first cham# ber independently of said first fuel inlet for actuating said diaphragm in a direction to open said second valve member, said valve body having additional port means for delivering fuel into said second chamber from said first fuel outlet when said first valve member is open to equalize the fuel pressure in the' chambers on opposite sides of the diaphragm. and means for actuating said diaphragm in a direction to close 10. A burner control system according to claim through said port means for actuating the valve means in the fuel supply line for said first pilot burner to open position upon closing of the safety shutoff valve in the fuel supply line for the main burner.

11. A burner control system according to claim 9 wherein the safety shutoff valve in the fuel supply line for the main burner is under the control of an electromagnet connected in circuit with a thermoelectric generator subject to the heat of said pilot burner means.

12. A burner control system according to claim 9 wherein the pilot burner means comprises a second pilot burner in addition to said first pilot said second valve member upon equalization of pressure upon opposite sides of the diaphragm.

16. In apparatus of the class described, incombination, a control device comprising a valve body having a first fuel inlet and a first fuel outlet, a first safety valve member for shutting off communication between said rst fuel inlet and said first fuel outlet, said valve .body having a first chamber and a second chamber separated by a diaphragm, with said chambers disposed on opposite sides of said diaphragm, said valve body having a second fuel outlet, a nrst pilot burner connected to receive fuel from said second fuel outlet, a second valve member for controlling said second fuel outlet and operable to openposition by fuel pressure in said first chamber for supply of fuel to said second fuel outlet when said first valve member is closed,

burner, and wherein there is a fuel supply line 1I said valve body having first port means for desecond pilot ently of said first fuel inlet for actuating said ,diaphragm in a direction to open said second valve member, said valve body having second port means for delivering fuel into said second chamber from said first fuel outlet when said first valve member is open to equalize the fuel pressure on opposite sides of the diaphragm, means for actuating said diaphragm in a direction to close said second valve member upon equalization of pressure on opposite sides of the diaphragm, a second pilot burner, a first fuel supply line leading to said rst port means and to said second pilot burner /for supplying fuel thereto, a third stand-by pilot burner, a iain burner, a second fuel supply line leading through the valve body of said control device to said main burner and 'to said third stand-by pilot burner for supplying fuel thereto, a first shutoff valve in said first fuel supply lineanterior of said first port means and said second pilot burner, and a second shutoff valve "terconnected with said first shutoff valve forfoperation therewith and disposed in said second fuel supply line posterior to the first safety' valve member of said control device.

17. Apparatus according to claim 16, wherein the first safety valve of said control device is under the control of an electromagnet connected in circuit with a thermoelectric generator subject to the heat of the first pilot burner.

18. In apparatus of the class described, in combination, a main burner, a fuel supply line for supplying fuel to said main burner. a first pilot burner, a safety shutoff valve in thefuel supply line for said main burner, said safety shut off valve having a fuel inlet and a fuel outlet, an electromagnet connected in circuit with a thermoelectric generator subject to the heat of said first pilot .burner and operable to maintain said safety shutoi! valve open when said first pilot burner is ignited and to release said safety shutoff valve for operation to closed position when said rst pilot burner is extin- 12 guished, a second stand-by pilot burner in luxtaposition to said main burner, and a fuel supply line for maintaining a supply of fuel to said second stand-by pilot burner from the fuel outlet of the safety shutoil valve in the fuel supply line for the main burner, whereby to maintain said second stand-by pilot burner ignited if said safety shutoff valve remains open after said first pilot burner is extinguishedsaid safety shutoff valve in the fuelsupplyline for the main burner being arranged so that when in closed position it shuts off the supply of fuel to both said main burner and to said stand-by pilot burner.

' 19. Apparatus according to claim 18 wherein there is additional shutoff means in the fuel supply line leading to the main burner and in the fuel supply line leading to said ilrst pilot burner, which additional shutoff means is adapted to shut ofL the supply of fuel to both the main burner 'and the first pilot burner and is capable of being opened to reestablish a supply of fuel to the main burner and to the first pilot burner without ignition of said first pilot burner, the additional shutoff means in the fuel supply line leading to the main burner being disposedk between the fuel outlet of the safety shutoff valve and the main burner.

ERNST WITZEL.

REFERENCES CITED The following references are of record in the illeof this patent:

UNITED STATES PATENTS Number Name Date 2,063,834 Bast et al Dec. 8, 1936 2,072,034 Geurink et al. Feb. 23, 193'! 2,261,092 Peterson Oct. 28, 1941 2,273,127 McGoldrick et al. Feb. 17, 1942 2,291,567 Wunsch et a1. July 28, 1942 2,292,477 Ray Aug. 11, 1942 2,294,694 Ray Sept. 1. 1942 2,384,696 Ray l Sept. 11, 1945 2,437,894 Ray a Mar. 16, 1948 Disclaimer 2,506,403.Emst Wz'tzel, Milwaukee, Wis. BURNER CONTROL SYSTEM AND CONTROL MEANS THEREFOR. Patent dated May 2, 1950. Disclaimer Mz'Zwa/avee Gas Specialty Company.

led Apr. 6, 1951,10y the assignee,

9, 11, and 14 of said patent..

Hereby enters this disclaimer tO claims [Oycz'al Gazette May 8, 1.951.]