US1804849A

US1804849A - Fuel regulator

Info

Publication number: US1804849A
Application number: US189506A
Authority: US
Inventors: Alfred H Thompson
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-08-16
Filing date: 1926-08-16
Publication date: 1931-05-12
Anticipated expiration: 1948-05-12

Description

I May 12,1931. l A. H. THOMPSON 1,804,849

FUEL REGULATOR A May vl2, 1931. A. H. THoMPsoN 1,804,849

FUEL REGULATOR Filed Aug. ,16, 1926 2 sheets-snet 2 5/ /3 lla D 'INVENoR ,lffedJvf-@hom on.

BK ATTORNEY 25 to-a minimum.

Patented Mayv l2, 19131 UNITED. 'STATES l lna'ralalr' OFFICE 121mm n. "rnoursou, or Los menne. camoam' FUEL REGULATOR appnoaunn mea August 1e, 192s. serialnq. 189,506.

This invention relatesto controls for fuel burners, and moreparticularly to automatic controls for fuel burners, suchl as gas,'oil

3 or other fuel burners.

burner contro -An object of the invention is to provide an automatic fuel burner control which will v be simple in construction, durable, and highly eflicient in operation. l

-An object is to provide a novel automatic -fuel burner control which may be arranged to effect either a adual, ory an almostinstantaneous action 1n shutting oif or opening -the iiow of fuel to the burner.

An object is to provide novel mechanism for opening and closing a valve 'that controls a flow of fuel to a burner.

An object is to provide novel means for controlling the app ication of pressure to one side of a diaphragm the flexing of which opens or closes a valve inter osed in a line that connects the burner wit thefuel supply line. i

Another ob'ect is to provide novel automatic means or permitting the escape of a valve operating medium, applied under pressure to a diaphragm chamber, after such medium has been entrapped in said chamber.

My invention is new in the respect that I provide a movable valve seat adapted t'o be moved into enga ement with a movable valve; and is furt er new in the provision of a valve and a stationar seat therefor to control a flow ofl as an of an :auxiliary valve mounted ont e samevalve stem and a movable seat therefor to control another lflow of gas after the first mentioned valve is i opened or closed. 60

The invention includes the parts and' combinations ofA parts more particularly hereinafterset forth. l A

Other objects, advantages and features of invention may appear from thev accompanyingdrawings, the subjoined detail description and the appended claims. i The invention is illustrated-in the drawings which forma part ofthis specification y i l and in which; Y

Figure 1 is an elevation of a hot water heater equipped with my invention as more particularly shown in detail inpFigs. 2 and 3. Fig. 2 is an axial section of my invention shown in Fig. 1 and which is constructed to control a 4valve so that an almost instan- Ataneous action is obtained in shutting off or opening the fuel fiow to the burner. The parts are shown in position to close the valve controllin the flow of fuel to the burner. and which is esired when theheater i-n Fig. 1 attains a predetermined degree of heat.

Fig. 3 is a fragmentary axial sectional view of my novel control means, showing the parts in position to ermit flow of fuel to the burner in Fig. 1 wlien the boiler has a temperature lower than that at which vthe fuel How is turned off. The parts also illustrate the positionv of the control means in the hot position in Fig. 7

Fig. 4 is an axial section of a modified form of the application of my invention to obtain-a graduated action of fuel control.

Fig. 5 is a sectional detail view `of the ioating valve casing or housing and diaphragm clamping unit used in connection withdtl71e constructions shown in Figs. 1, 2, 3 an Fig. 6 is a detail sectional view of the oatlng'valve seat which is enclosed in and operateswithinthelloating valve casing or housing,- shown in Fig. 5.

Fig. 7 is an elevatlon of a steam boiler epuipped with a form of my invention ana ogous to that shown in Figs. 2 and 3, but which is operated .by the pressure of the steam generated in theboiler.

Fig. 8 is a fragmentary view of a hot water heater, shown partly in elevation and my valve control s own in Fig. 4.

- partly in section, e uipped with the form of 1 Fi 10 is a sup ly valve an itsdiaphragm operating mec anism takenponline w10, Fig. 11,-. .11 is a planview of Fig. 10. j

l -I 3.inclusive, Figs. to? inclusive, andFigs.

v10 and 11, includes a valve control deviceI 1,

a. valve operating device 2 under control of device 1 and ada ted for operating a fuel burner control vave 3' connected to the tire bo'x of a boiler or hot water heater 4.

Thevalve control 'device -1 includes a `main .control valve5, an auxiliary control .orfloat-g ing valve 6, and suitable meansdor-foperata Aing the valves 5 and Gsueh 'as-thermostatie' means comprising an .expansibleg and foil;

tract-ible. element' 7 fand valve' y, actuating means 8 as shown in.Figs.` 1 `-3 or byv pres-fA sure operatedY means' .as-shown in Fi`g.7

The valve 5 is mounted in a valve `casing 'unit' 9 'providedwith a passageway compris-V ing an'opening '10 which may be an inletI and with an opening 11 which may beyan outlet. The unit9 is formed with a partition -wall 12 extending across said passageway, a port 13 .in wall12 is controlled by the valve 5 which'y is'adapted to engage and b e moved away said port.

from a stationary seat 14 formed around The lower or outer -end ofcasing- 9 is plrovided kwith a threaded opening 15 in -whic is seated a screwl plug ,16j formed with4 a guide 17 through whichreciproeatesthe lower end of the rodl or valve stem 18 to 'Y which the valve 5y is fixed by a pin a. The. plug 16 is formed with a threaded recess '19- elow and around the guide 17 and in which is seated a screw cap 2O provided with a recess 21 in its inner side to receive the lower or outer end of the valve stem 18. The cap encloses the lower orl outer end of stem 18 andprevents'leakage from the valve. casing 9 through guide 17. The upper end ot valve casing 9-is provided with a port 21 and is formed with an external flange 22 the upper surface 23 of which is concaved, the purose for which will be more fully herema er described. A compression spring 5a surrounds the valve stem 18 and operates between plug 16 and valve 5 and exerts a pressure tending to urge the valve 5 against its seat 14.

The floating valve comprises an elongated hollow member 6a, that is closed on one end vand slidably mounted in an axial bore 25 formed in an auxiliary valve casing or housing 24 which has an external concaved flange 26 formed' on the lower end thereof that is detachably secured to flange 22 by bolts 28. The valve seat member 6a is closed atone end and at its open end is clamped to Fi i. 9. is a horizontal section taken on linel longitudinallsection olf the gas 1 means .of an external langez() formed on'its lower end which. engages .the under side of the diaphragm, and a nut 32 screwed onto va j' .threaded portion :3 1 jon-l"I said member 6a. n The nut 32eng'ages .theupper side of dia- My invention as illustrated-'in Figs. 1 to" fner 'surface 33 of the llange'26 is concavedv vand :such formation together with the concaved-inner surface 23 of flange 22 fornisa chamber 34 in whichthediaphragm 29 may flexed.` The lower end of the auxiliaryvalve casing 24' is recessed at 35 to receive jlandaccommo'date the' nut 32".. The valve me1nber. 6a' is of tubularformation," being A 'A open i'tjitsy lower end'and closed fat' its upper `end by'a vhead 36, in the inner side ofwhlch ifsfprovided-.a guide 37` inwhich slides the upperfen'd of the valvest'emzlS thatextends upwardly inthe 'valvefseat' of the. auxiliar-yf.

valve. I The valve member/'6a. is provided Witha plurality-.ot ports 38 in the upper l with an annu'largr'oove239 `formed in. the

Ipax-rt of its wall. The ports communicate auxiliary valvetcasing 24 around the valve;

member 6'a.- TheV auxiliary valve casing 24 is provided with a port 40 which communicates with the annular groove 39 andsuch port is connected .to the. supply valve operating medium or to the tire box as will'b'e ,hereinafterV4 more particularly described.

a An auxiliary. valve 42isl secured to valve stem 18 abovevalve 5 by means of pin 41 andis adapted toengage a tapered portion 43 that is vformed on'the lower e'ndof vmember 6a and encircles ,the open end thereof and extends slightly below the Han e 30 and is machined to an annular edge orell'ecy tively engaging the valve 42 of the auxiliary valve. A compression spring 44 surrounds the valve stem 18 within the auxiliary valve member 6a and operates between the valve 42 and the head 36 of the auxiliary valve member 6a to normallyv urge, thetloating valve seat 43 away from'its valve 42. The spring 5a is capable ofexertinga greater expanding torce than spring 44, the purpose o f which will be apparent from the ,operation of the device.

The thermostatic means 7 comprises a tube of suitable expansible and contractible material, and said tube is closed at one end by a head 51, and is threaded at its'other end into a threaded nipple 52. Within the tube 50 are rods of non-expansible material, such as a long carbon rod 53 and a short carbony rod 54. The rod 53 is of suliicient length that its upper end bears against the 4tube head 51, the rod 54 being located in the inner endof the tube50 and partly in the nipple 52 andfbears against the inner end of the rod 53 and the outer end of a short brass plunger 55 which is located in and proj ectsl from the inner end of the nipple 52.

from said arms 7 8, and a slotted lug 80 up:

element 7 isl in 5 of lever 63 and engaging the pivoted end of lever 62. The valve housing 24vis formed at itsupper end with'an external flange 65 to which a diaphragm 60` is clamped, the upper `surface 66 of flange 65 being conrests upon the diaphragm 60 over the flange 65". The member 67 is provided with a threaded extension b -adapted to receive a yoke member c that carries. the valve op-` erating means. yThe diaphragm 60. and

flanges

65, 68 are bolted together by bolts 69iand nuts'70. Washers 71, 72 on opposite sides of diaphragm 60 are secured toether and to the center of said diaphragm y a rivet 73 and form a bearing plate on said diaphragm. The washe'l` 71 rests upon the head 36 of the floating valve seat 6a. A valve operating plunger 61 is slidably mounted in a guide 74 formed in member 67 and extension b and rests upon the rivet 73 secured to the diaphragm 60. The flange ,.68 has its lower side 75 concaved which to- ,"gether--with the concaved upper surface G6 of flange 65 forms a diaphragm chamber 76 in which the diaphragm 60 may vibrate. Theyoke member c is formed with ay pair vofupstanding arms 77, a pair of upstanding arms 78, a support 79 extending outwardly standing from the outer end of said support 79, the arms 77 `78 are preferably disposed l* o equi-distant from the plunger 61 and diametrically opposite each other while the lug 80 is disposed a suitable distance outwardly from the plunger 61.- The' levers 62, y63 are mounted between the arms 77 78, the lever 62 being pivoted at `81 in the slotted lu 80 and the lever 63 being pivoted at 8g between the arms 77. The arms 7 8 form a 'guide for

levers

62, 63 and together with arms 77 form a support for a threaded annulus 86. The swinging or free end of lever 62 rests upon 'the upper end of plunger 61, and the lower end of the brass plunger 55 rests upon lever 63 near the pivoted end of said lever. The adjusting screw 64 maybe locked in any adjusted .position by a set screw 83.. A-n adjustment stop collar 84 of a thickness predetermined by the length of the expansiblel tube, surrounds the thumb screw 64 between the -head 85 thereof and lever 63 and rests upon the. lever 63. The

. 64 and prevents the lever 62. from being adjusted such a distance.y toward the member 67 when the element 7 is" expanded that such i l, lever 62 will enga e the member c when the lgully contracted position.

.nipple 52. la-wrench i engages the upper face of annulus 86. .The le 52 has a conical threaded portion,`

caved. A diaphragm clamp and operatingl lport 94a leading into 106 in the collar 84 limits the adjustmentof the screw` The internally on -the upper end of'thelugs 7 7, 78 1s .adapted to receive a threaded end 87 vof l The nipple 52 is provided with 7'0 seat 88 that forms a stop which threaded 86 formed 89 that is adapted for threaded engagement with the side wall of a boiler or hot water heater:

The valve operatin device 2 includes va main diaphragm r91` andan auxiliary diaphragm 92. The diaphragm 91is'mounted 1n a chamber 93 formed' by

chamber members

94, 95 secured together by bolts 96 and lnuts 97, the diaphragm being secured at its edge between the meeting edges of the

members

94, 95.. Theupp'er member 95has a the chamber 93 above the diaphragml 91. Metal disks 98 and 99 arev secured at their center to the center of the diaphragm 91 onthe lower and upper i sides, respectively. of the diaphragm Aby means ofl a rivet 100." Thefdis 98 covers the greater portionv of the area of the diaphragm 91- while the disk 99 is used merely as a securing means. v A` fitting 101 is secured to the under side of member 94 by means ofy bolts 102, which extend through a flange 103 on said ittin and through the diaphragm 92 near the e ge thereof. .The

tion by said bolts b and flange 103. The upper end of th fitting 101 and the lower side of.member 94 are concaved to provide 'a diaphragm chamber 104 inl which the diaphragm" 92 may diaphragm 92 is secufvrely clamped in posij ween the membe 94 vibrate. A plunger 105 has a head 1050.`

which rests against diaphragm 92 and-said plunger extends between diaphragm 91 and Adiaphragm 92 through an opening 107 formedin member 94 and is adapted to transmit movement from diaphragm 91 to plunger 105 which hasa head 105 resting against diaphragm 92 underneath the point of contact of head 105e. The lower portion 105 extends into an axial vbore l fitting 101. The upper end of plunger 105 engages the lower end 4of the rivet whichserves as a bearing member of plunger that prevents undue wear at the point of contactof plunger 4with diaphragm 91p .The fuel control valve 3 that controls the flow of fuel to the burner includes a .valve casing which is previded with an inlet l113 and an outlet 114 apartition wall115'- between said inlet `an l outlet and in which wall is a port 116 that isk'surrounded by a valve seat -111 on which a valve 112 lcontrolling said port is' adapted to seat..v The'valve 112 is secured on a valve rod 117, the lower end of which is slidably'mounted in a guide 118 formed in the lower-ipart of the-valve casing 110, and the upper end of which is slida y mounted in a guide 122 formell in a head 121 that l* is screwed into threaded opening 120 in valve casing 110; The valve rod extends through head 121 asuflicie'nt distance that the upper end of the valve rod 117 engages the lower endof the diaphragm plunger 105 and receivespressure therefrom to reciprocate the valve rod 117. A compression spring 119surrounds the valve rod 117 between the guide 118 and the valve 112 and exerts a pressure on valve 112 that tends to urge said valve olf from its seat 111 or to diaphragm chamber 93. A pipe 129 controlled by valve 130 connects the port- 40 to a suitable source of a gas supply which may be the same as that leading to the fuel burn er 200 and under control of the gas burner control valve 3, provided gas is being used as fuel. A pipe 131 connects port 10 of valve 5 with the atmosphere preferably Ain the lire box 127 of the water heater 4. The `thermostatic element 7 is connected to the. heater 4 so that it extends into the chamber 132 of the hot water heater 4, the threaded portion of the nipple 52 being screw seated in a threaded opening 133 provided in the wall of the heater.

Valves

134, 135 may be placed in the fuel supply line 125 and pipe 126, respectively.

If a liquid fuel is to be burned in the fuel burner the valve 112 in control valve 3 may be changed to the well-known type of needle valve used to control a liquid supply to the burner and pipe 129 is connected to any suit able source of a valve' operating medium such as gas or air under pressure.

If it is desired to connect myfuel regulator to a steam boiler 150, as shown in Fig. 7, the thermostatic element 7 is removed by unthreading the supporting member 0 from the threaded extension and a regulator 140 screwed onto said extension, said regulator is connected by a pipe 141 to the steam chamber of boiler 150 to permit said regulator 140 to be operated by the pressure of the steam generated in the boiler. The construction and operation of regulator 140 is analogous' to that shown in my Patent No. 1,240,102, granted September 11, 1917, and will not be described or shown in detail, reference being made to said patent for further description thereof. In this form o f assembly the plunger 61 will be operated upon by the reriprocating element 142 of regulator 140. In lthis form of assembly of my invention it is apparent that when the pressure of the steam in boiler 150-exceeds a predetermined amount and which may be termed the hot position that the reciprocating element 142 will be forced downwardly against a plunger 61 to close and open the valves and 6.

Due to this reversal of operation of the valve stem 18 when the boiler attains afhot position in Fig. 7 it is necessaryto change' the connections between thesource of supply to the control valve operatingmedium also to change the connection leading ,from port 40. Such changes compriseconnecting pipe 131 to asource of a valve operating medium instead of to ,the iirevbox 'as shown I :.11 in Fig. 1 and connecting p ortJ 40-to the.

ire box'by a pipe 129. The outlet-'11 in@` with a thermostaticv gas valve con-trolthat will give a graduated actionof the -iame in' the fire box, I s imply remove auxiliary valve housing 24, diaphragm 33, valve 42, and

associated parts and shorten the valve stem- 18 as shown in Fig. 4. The flange 68 vof supporting member 67 is clamped onto. lflange 22 of valve casing 9 with the dia# phragm 60 therebetween.`

The device is then secured to a hot water heater 4 in the same manner as thedevice shown in Fig. 1 and the valve 5 is connected, see Fig. 8, to a source of fuel supply by a pipe 125 which is attached to inlet 11 of valve casing 9, the outlet 10 of which is connected by pipe 151 to the burner in re box 127 of the hot water heater 4.

The operation of my invention as described in connection with Figs. 1-3, 5, 6 and 9-11 is as follows:

l/Vith the valve 5 open as shown in Fig. 3 the pressure of the valve operating medium will be relieved from chamber'93 and the spring 119 will hold the valve 112 0H its ,seat 111, and with valves 134and 135 open,

fuel from the fuel supply line 125 may pass through the burner control valve 3 and pipe 126 to the fuel burner in the re box 127 of the water heater where such fuel is ignited. This condition will remain until a predetermined degree of heat is obtained in the heater 132 when the tube 50 of element 7 will expand and move the head 51 of tube 50 away from the -non-expansible rod 53 which will be forced against head 51 by Vspring 5a operating through valve stem 18, spring 44, valve seat 6m, diaphragm 60,-plunger 61, and means 8.

This movement .of the valve stem 18 will continue upon expansion of tube` 50 until valve 5 engages its seat 14 and upon further expansion of tube 50, spring 44 will` force the floatingv valve seat Gaawayfrom the 755 l and the passagecontrolled by valve 5 andand which contraction causes the plunger 61 valve 112 engages its seat 111 and closesv 'valve 3 and thus shuts olf the flow of fuel through pipe 126 to the burner.'

The pressure of the valve operating medium is communicated to chamber 93 when valve 6 is opened because such medium will flow from its supply line through pipe 129, port 40, groove 39, ports 38, auxiliary valve 6, opening 21, valve casing 9, port 11, pipe 128 into chamber 93 and will exert its pressure 'against the upper side of the diaphragm 91, forcing said diaphragm downward and closing valve 3 as above set forth.

When -the heat of the heater, falls below said predetermined degree the tube 5() will contract and force the

rods

53, 54 and plunger 55 downward. The plunger 55 engaging the lever 63 swings said lever downward and the adjusting screw 64 engaging lever 62 forces the latter lever downward as well as plunger 61 which it engages. The diaphragm and auxiliary valve seat 6m are forced downward against the tension of spring 44V until said auxiliar valve seat 6a engages valve 42 and closes t e auxiliary valve '6 to shut off the communication of the pressure of the valve operating medium to chamber 93.

The valves 6 and 5 are now closed and a volume of the valve operating medium from the supply line is sealed in the chamber 93; andv in order to permit valve 3 to open this medium must be removed. This is accomplished upon further contraction` of tube 50 dueto a falling temperature in heater 132 to be moved further downward as well as valve seat 6a which 'further downward movement will force valve stem 18 downward4 through the medium of valve 42- and against the tension of spring 5a and force valve 5 olf from its seat 14 and thus open the passage controlled by valve 5 and which may lead from chamber 93 to the ire box of the burner through' pipe 131. This permits the medium trapped in chamber 93 to be exhausted into the ire box where it may be consumed and the removal of such medium and its pressure from chamber 93 per- -mits spring 119 to force valve 112 off seat 111'and thereby instantly permit the iow of fuel from the supply direct to the fire box. The` tension of springs 44 'and 5a is so calibrated that the valve 6 will be closed against tension of spring 44 before spring 5a will be compressed. The complete and positive opening and closing of valve 3 is believed apparent from the fore oing'and will per-- mit of an immed-iate ow of fuel to the burner and an innnediate stoppage of such How, and thus I obtain a valve action that is as, positive and instantaneous as may be obtained by the manual opening or closing of a' fuel control valve.

By constructing my invention with' the

diaphragms

29, 60 and92 the passage of the valve operating medium past such members s eliminated and I thus dispensewith the necessity o f stuliing boxes in which the valve stems often freeze and thus render the device inoperative.

The operation of my invention lapplied. to

a heater in the manner shown in Figs. 4 and 8 is believed to be apparent from the foregoing. However, in this assembly the expansion of tube 50 will permit the spring 5a to gradually close valve 5 and thus gradually diminish the flow of fuel to the burner through pipe 125, valve 5 and pipe 151; and the contraction of tube 50 will graduallyA open the valve 5 in a manner apparent from the operation of the thermostatic means described in connection with operation of my invention shown in Figs. 1-3.

The operation of my invention when applied to a steam boiler as shown in Fig. 7 is as follows.: The parts of the valve control device 1 will be in the same shown in Fig. 3 when the boiler 1s hot, and such position will be occasioned by the pressure of the steam from the boiler 150, op-

erating through pipe 141 to apply pressure to the regulator 140 which in turn depresses plunger 61 and valve stem 18, to move the valve 5,-away from its stationary seat 14, andthereby permit flow of fuel from the fuelsupply line 125 through

pipe

13,1 into the valve casing unit 9 through port 13 and into pipe 128, from which it flows into the lupper chamber 93 of the valve operating osition as' device 2 to operate upon the diaphragm 91 and close the fuel burner control valve 3.

When the temperature or pressure in the boiler is reduced so as to permit the reciprocating element 142 to relieve its pressure upon plunger 61, the valve 5 will be moved against its seat 14 to shut off the flow of fuel from the main supply line 125 onto the diaphragm 91, andthe fuel trap'in cham- -ber 93 will flow past valve 43 and through the ports 38 into chamber 39, and thence throughv pipe 129 into the fire box, thereby relieving the pressure on the diaphragm 91 and permitting spring 119 to open valve 112 and permit fuel to flow from the main supply line directly into the fire box 127 of the boiler 150.

I claim:

1. In a device of the character described,

a valve; a valve seat for said valve; a valve stem to which said valve is Hxed; another valve fixed to said valve stem and movable therewith; and a movable valve seat upon which said other. valve is adapted to seat.

l 2. In a device of the character described, the combination of a valve; a valve seat for said valve; another valve; a movable valve seat upon which said other valve is adapted to seat; spring means normally urging said first mentioned valve .toward its seat; and

otherspring means normally urging saidhousing provided with a Hange; a diaphragm clamped between said Hanges; a valve seat fixed to said diaphragm; a valve stem slidably mounted in said casing and valveseat; a valve fixed to said stem and adapted to engage said valve seat; another valve mounted in said casin and adapted to engage a valve seat in said casing; and means adapted to close one of said valves and to open the other of said valves.

5. In a device of the character set forth, a valve `casin having a Hange; a valve housing provi ed with a Harige and an axial bore; a diaphragm clamped between said flanges; a member fixed to said diaphragm and slidable in said bore; a valve seat on said member; a valve stem slidably mounted `in saidvcasing and said member; a valve fixed to said stem and adapted to engage a vvalve seat in said casing; another valve fixed to said stem and adapted to engage said first mentioned valve seat; and means adapted to close one of said valves and to open the other of said valves. e

6. In a device of the character set forth, a valve casing havin a Harige; a valve housing provided wit a flange; a diaphragm clamped between said Hanges; a

' member havingl a valve seat fixed to said diaphragm; a valve stem slidably mounted in said casing and said member; a4 valve fixed to said stem and adapted' to engage a valve seat in said casing; another valve Aadapted to engage said first mentioned valve seat; a` spring encircling said valve stem and adapted to lnormally urge said first mentioned valve seat away from its valve; a spring normally urging the valve in said casing toward lits seat; and means adapted to successively open and close said valves and to close and open said valves.

7. In combination; a fuel burner; a fuel burner control valve; a chamber; a diaphragm mounted in said chamber; means connecting said diaphragm and said valve to o erate said valve .upon flexing of said.'

diap ragm; a passage connecting said chamber to a valve operating medium supply; another passage adapted to connect said chamber to the atmosphere; and means adapted to close the passage from said" chamber to the atmosphere at a predeter-y mined degree of heat produced by saidburner, and to open the passage between the chamber andsaid'supply to permit the pressure of the supply to 'be applied to said diaphragm to Hex the s ame and close the burner control valve.

8. In combination; a fuel burner; a fuel burner control valve; a chamber; a diaphragm mounted in said chamber; means.

connecting said diaphragm and said valve to oplerate said valve upon Hexin diap ragm; av passage connecting said chamber to a valve operating medium supply; another passage adapted to connect, said chamber to the atmosphere; and means adapted to close the passa'ge from said chamber to the atmosphere at a predetermined degree of heat produced by said burner, and to open thepassage between the chamber and said source of 4supply to permit the pressure of the supply to be applied to said diaphragm to Hex the same and close the burner control valve; said means also 'being adapted to close the passage between said chamber and the source of supply Vand to open the passage from said chamber to the atmosphere to permit the medium in saidl chamber to escape so that said diaphragm maybe flexed to open the control valve.

9. Incombination, a fuel burner control of said valve; a closing device for said control valvev adapted to be operated by a medium under pressure; and a heat-operated control lde vice comprising a main valve for controlling the escape of such medium from said closin device; another valve for controlling the a mission of such mediumto said closing device; a valve rod on which said main valve is mounted; a seat movable on said rod for said other valve; a diaphragm to which said seat is connected and through which said seat extends; said heat-operated control device being adapted, when acted upon by a predetermined degree of heat, to close said main valve and to open said other valve to admit such medium tesa-id closin device to close said control valve; a spring o ing said control device falls below sai predetermined degree; and a s ring for openin said other valve after sai first lmentione valve is closed.

10. In combination, a fuel burner control valve; a closing device for said control valve lll r closin` ing said main valve when the heat o eratflog pressure; and a eat-operated control device comprising an expansible and contractible element; a non-expansible element in said expansible and contractable element; a main valve for controlling the escape 'of such -mediuml from said closing device; another valve for controlling the admission of such medium to said closing device; a valve rod on which said main valve is mounted;I a seat movable on said rod for said other valve; a diaphragm to which said seat 'is connected and through which said seatextends; a plunger; a diaphragm extending between said other valve andsaid plunger;

a pair of-levers; one of said levers engaging` said plunger; an adjusting screw on the other lever engaging said irst lever; and the second lever engaglng said non-expansible element whereby said main valve is closed and said other valve opened when said expansible element is acted upon by a predetermined degree of heat, so that such medium 'is admittedto said closing device to close said control valve means -for closing said other valve when the heat acting upon said ex ansible element falls below sald predetermined degree and for opening said main valve when the other valve is closed to permit the escape of such medium from 'said closing device to enable the control valve to be opened.

11. In combination, a fuel burner control valve; a heat-operated control device comprising an expansible and contractible tube closed at one end; an elongated rod of nonexpansible material in said tube engaging at one end the closed end of said tube; a

.short metal plunger engaging one end of said .elongated ro a lever engaged by the :other .end of4 said metal plunger; fa :second lever; an adjusting screw in said first lever engagingv said second lever means actuated by said second lever for closing said control valve when said tube is expanded by a predetermined degree of heat; and means for opening said control valve when said tube is contracted by the heat acting upon said tube falling below said predetermined de ree.

12. In combination, afuel burner control valve; a valve; a spring for normally. holding said valve open; a main diaphragm; an auxiliary diaphragm; a chamber-in which said main diaphragm is mounted; a chamber in which said auxiliary diaphragm is mounted; a plunger operating between said auxil'- iary diaphragm and said main diaphragm; another plunger operating between said auxiliary diaphragm and the upper end of said valve and being in engagement with said valve; a valveoperating medium supply being connected to said first mentioned chamber above said main diaphragm; and means for controlling the admission of such me;

dium to said main diaphragm chamber above said main diaphragm toA close said control valve when a predetermined degree of heat is produced by the burner controlled by said control valve; said means also being adapted to permit escape of. the medium in the main diaphragm chamber above said dia' phragnl when the heat produced by the burner falls below said predetermined degree to permit said fuel burner control va1ve, 75.'

to be opened. j

. 13. In combination, a fuel burner control valve; a closing -device for said control valve adapted to be operated by a medium under pressure; and a heat-operated -control device comprising a valve casing; a main valve in said casing Jfor controlling they flow, of such medium from said closing device; a valve housing; a supporting member; a diaphragm between said valve lcasin and said housing; said valvecasing an housing being secured. to ether with said diaphragm clamped there etween; another diaphragm; the housing4 and supportin member being secured together with sai other diaphragmf therebetween; an auxiliary valve comprising a hollow sliding valve seat member mounted fin said housing andv secured at one end to sald first mentioned` j A diaphragm and engaging the other 'diasaid l phragm at its other end; said sliding valve y seat member `having ports therein; vsaid housing having an annular groove therein with which said ports communicate: 'said housing having a port communicating with said groove; a rod on which said main valve is secured and which extends into said hol-l low sliding valve seat member, a valve secured to said rod 'for said sliding valve seat; an Aexpansilole and eontracti-ble element y 'mounted on, lsaid"supporting member; a

plunger .inthe supporting member engaging at its lower end'said other diaphragm;

means for closing said auxiliary valve and opening said main valve when the heat acting upon'said element falls below a preion aos

determined degree; means for closing said l vable by movement of said plunger and dian phragm; spring means adapted to move said plunger in one direction; means adapted to move said plunger in another direc tion, said last mentioned means comprising a yoke member attached to said supporting member; levers each havin one end pivoted to opposite sides of sai yoke member,

'one of said 'levers being adapted to oper.

. ate against said" plunger; an adjusting screw mounted in said other lever and adapted to operate against said plunger operating lever; an adjustment stop collar O predetermined thickness surrounding said adjusting screw to limit the adjustment of said Y screw; and thermostatic means adapted to n move said levers -to operate said plunger.

V15.111 combination, a fuel burner control valve; a closing device for said control valve adapted to beoperated-by a medium under Y pressure; a heat operated control device comprising a valve and controlling the admission of such medium to seidclosing device; another valve for controlling escape c' such medium trom said closing device an expansiloie and contractible element; means interposed between seid element and said medium escape cent-rolling valve adapted when said element is acted upon icy a predetermined degree of heet te open the medium admission controlling valve te admit such medium *to-said closing device to clcse said control valve and to close the valve that controls the escape cf such medium; means 1 for closing the medium admission control valve when the heat acting upon seid ele-v ment falls below a predetermined degree; i and means for opening the medium escape control valve when said medium admission control valve is closed to permit the escape of such medium from said closing device to enable said control valve to beopened.

yIn testimony whereof, I have hereunto set my hand at Los Angeles, California, this v 11th day of Au AL RED H. TiloMPsolv,i