US3065913A - Regulators for gas burners - Google Patents

Description

NV- 27, 1962 w. H. HoLzBooG ETAL 3,065,913

REGULATORS FOR GAS BURNERS Filed 0013. 26. 1960 5 Sheets-Sheet l W. H. HOLZBOOG ETAL Nov. 27, 1962 REGULATORS FOR GAS BURNERS 3 Sheets-Sheet 2 Filed Oct. 26, 1960 FIG-Z Flr NOV- 27, 1962 w. H. HoLzBooG ETAL 3,065,913

REGULATORS FOR GAS BURNERS Filed OCT.. 26, 1960 3 Sheets-Sheet 3 United States Patent iiiice:

3,065,913 Patented Nov. 27, 1962 3,065,913 REGULATRS FOR GAS BURNERS Walter H. Holzboog, Clayton, and Hamid C. Reinhart, Ferguson, Mo., assignors to Micro Controls, Inc., Sit. Louis, Mo., a corporation of Ghio Filed Oct. 26, 196i), Ser. No. 65,691 7 Claims. (Cl. 236 68) This invention relates to regulators for gas burners, and with regard to certain more specific features, to temperature-regulating means for oven-s of cooking ranges and the like. y

Among the several objects of the invention may be noted compact regulator control apparatus for gas burners which in an improved manner maximizes the range of more gradually regulated temperatures; the provision of apparatus of the class described which accomplishes the regulation with adequate safety land with minimum ternperature swings; and the provision of apparatus of the class described incorporating regulating and safety features which minimize the effect upon their operations of ambient temperature conditions, Other objects and features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the elements and combinations of elements, features of construction, and arrangement of parts which will be exemplified in the structures hereinafter described, and the scope of which will be indicated in the following claims.

In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,

FIG. 1 is an axial section of a regulator constituting part of the invention, the section being taken on lines 1 1 of FIGS. 2 and 9;

FIG. 2 is a left-end view of FIG. 1;

FIG. 3 is a detail section taken on line 3 3 of FIG. 2;

FIG. 4 is a left-end view oi a detached body member of the regulator shown in FIG. l, showing the positions of certain gas passages;

FIG. 5 is a jogged vertical section taken on line 5 5 of FIG. 4;

FIG. 6 is a horizontal section taken on line 6 6 of FIG. 4;

FIG. 7 is a cross section taken online 7 7 of FIG. 4;

FIG. 8 is a detailed cross section taken on line 8 8 of FIG. l;

FIG. 9 is a right-end view of FIG. l, drawn on a reduced scale;

FIG. 10 is a plan view of a safety valve construction forming part of the invention;

FIG. ll is a vertical section taken on line 11 11 of FIG. 10;

FIG. l2 is a left-end view of FIG. l1;

FIG. 13 is a diagrammatic view showing how various parts of the invention are connected to form a complete safety regulator system for a gas burner;

FIG. 14 is a cross section taken on line 14 14 -of FIG. l; and

FIG. 15 is a cross section taken on line 15 15 of FIG. l.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

in FIG. 1.

Although the invention described herein has general use, a particular use is for thermostatic gas valves for oven temperature control, in relation to which the invention will be described as an example.

Referring now more particularly to the drawings, FIGS. l-9 illustrate what will hereinafter be referred to as the main regulator R, its complete assembly being shown FIGS. 10-12 illustrate a safety and control valve construction. This valve construction is hereinafter lettered S. In FIG. 13 is shown a burner B being served by the apparatus. In this figure P is a constantly burning pilot, serving to ignite the burner B and to ignite an intermittent pilot burner I. Device L is a liquidfilled temperature-responsive bulb thermostatically serving the regulator R and located in the space to be heated by the burner B, as for example the oven of a cooking range. Device V is another liquid-filled temperatureresponsive bul-b thermostatically serving safety and control valve S. The intermittent pilot burner I is in effective heat-exchange relationship with the bulb V, but pilot burner P is not. Thus the pilot burner P serves only for ignition of burner B and the intermittent pilot I. Device M indicates the main gas line serving the apparatus. This is connected with the constantly burning pilot P by a line W. The intermittent pilot I is connected with the regulator R through a gas line X. The bulb L is connected with the regulator R through a liquid line Y. The bulb V is connected with the safety valve S through liquid line Z.

Numeral 1 (FIG. l) indicates a hollow casing formed of parts 3 and 5, held together by screws 7. At numeral 9 is shown a gas inlet which communicates With a conical v-alve seat 11 in part 3. An inlet tting 2 (FIG. 13) connects inlet 9 with the gas main M. The small end 13 of the conical seat 11 communicates with a main passage 15, which in turn communicates through a threaded outlet 17 with a compartment 19, the latter having a main gas outlet 21 in the part 5. The outlet 21 is connected by pipe 4 with the safety valve construction S (FIG. 13). The main passage 15 is also in by-pass connection with compartment 19 through passages 23, which are under control of an adjustable threaded control valve 25.

At numeral 37 is shown an outlet valve seat having a tubular threaded part or bushing 39 in the 4opening 17. This is grooved as shown at 40. Part 39 contains a spider 41 for seating a spring 43. The spider 4l contains openings 42. It also carries a hollow forwardly extending tubular part i4 which, through passage 4S in the spider 41, is in communication with groove 40. At the end of tube part 44 is asecond valve seat 46 which is machined in the plane of seat 37. Extending oppositely from spider il is a cylindrical extension 43 carrying a pin which forms an attachment for a slotted sleeve 91. The slots are shown at 92.

A double-walled cup 47 is located in the compartment 19. It has an inside wall 49 and an outside wall 51, the latter being soldered or otherwise attached to the end of a nipple and post 53, held by means of a nut in an opening in member 5. The marginal portions 57 of the cup members 49 and 51 are sealed together as by Welding or soldering, the remaining portions of the members 49 and 5I being unjoined. They are corrugated in their portions forming the inside bottom of cup 47. The outside member 51 is attached to a nipple 53 and is provided with an opening 59, communicating through the nipple with line Y. Line Y is sealed to the nipple 53 and extends to the bulb L, located in the Space to be heated.

The bulb L, line Y and available space between the bimetallic members 49 and 51 are lilled with a thermally vresponsive liquid which is adapted upon expansion in rcsponse to heating to enter betwen the members 49 and 51, so as to force them apart. This drives the bottom member 49 to the left away from bottom 51. The inner bottom 49 carries an attached guide member 65 which has a sliding engagement with a member 67 in which is socketed a stem 69 of a movable valve 71. lValve 71 has an outer portion 6 engageable with seat 37 and an inner portion 8 engageable with seat 46.

A spring rosette 73 is attached centrally to sleeve 65. Its central portion and member 65 slide on part 67. Spring lingers 14 of the Spring rosette 73 contact and press marginally against a plate 75, riveted to the end of the member 67. Thus in response to increased oven temperatures applied to bulb L, the fluid presses to the left the following parts: inside cup bottom 49, parts 65, 73, 75, 69 and valve 71. This tends to seat the parts 6 and 8 of valve 71 on seats 37 and 46, respectively. Spring 43 provides reaction between the spider 4:1 and the valve 71, biasing it toward open positions. Under conditions in which the valve 71 may have closed and further expansion of fluid occurs, member 65 will slide on member 67. As a result, the rosette spring 73 will deflect without damage to any parts. Upon cooling, the reverse action occurs as the valve 71 moves toward its open positions.

Referring to FIGS. 3 and 4, groove 40, through auX- iliary passages 33 and 35, is in communication with an auxiliary outlet 61. Gas line X leads from outlet 61 to the intermittent pilot I (FIG. 3). Flow through passage 35 is under control of an adjusting valve 63. A jogging auxiliary passage 12 leads from auxiliary passage 33 into the right side (as seen in FIGS. 4 and 8) of the conical valve seat 11 (FIGS. 1 and 3 8).

At numeral 77 is shown a manually controlled cupshaped conical plug valve located in the conical seat 11 (FIGS. l and 8). This valve has a hollow center 79 communicating with main passage 15. The hollow center 79 is partially surrounded by a groove S1 which communicates with the center 79 through opposite passages 83 and also through an intermediate passage S5.

This leaves a solid portion 87 of the valve 77 for controlling inlet 9 and auxiliary passage 12. The valve may be turned counterclockwise from its initial position shown in FIGS. -2 and 8. Initial rotation of valve 77 will open passage 9 before auxiliary passage 12 closes. This allows passages 12, 33 and 35 to receive gas for delivery via line X to the pilot burner I and adjustment of valve 63 may be then accomplished for a proper ilame at I. More extensive counterclockwise rotation rst closes the entrance to passage 12 and then reopens it.

Extending through the conical plug valve 77 is a control stem 89, in the right end of which is a pin 94 riding in the slots 92. Thus if the control stem 89 is turned, so is the threaded bushing 39 turned and axial positions of the valve seats 37 and 46 may thus be changed relative to the range of thermostatic movement of the valve 71.

The left-hand end of the conical valve 77 is provided with a hollow stem 97. A counterbored seat 99 is arranged in valve 77 for the reception of the end of a spring 101. The control stem 09 extends through the hollow valve stem 97 and out beyond its left-hand end. The hollow valve stem 97 and an arbor 105 are splined by means of conjugate flats 103. The arbor 105 is flanged as shown at 107. Thus the hollow valve stem 97 and the arbor 105 are adapted to rotate together but to have relative sliding movements. lSplined on the hollow valve 4 stem 97 by means of an extension of the conjugate iiats 103 is a washer 109. Washer 109 and the hollow valve stem 97 are adapted to rotate together.

The left end of the control stern S9 also has a flat 111 where it extends from the hollow valve stem 97, for the splined reception of a washer 113 having a cooperating conjugate at. Thus the washer and control stem 89 are adapted to rotate together.

At numeral 115 is shown a sheet-metal dial, located at the end of the hollow valve stem 97 and having a central hollow interiorly clearing the control stem 89 without any splined relation therewith. The dial 115 is provided with opposite notches 117, accommodating the shanks of screws 119, threaded into the washer 109. The heads 121 of the screws overhang the washer 113 and are adapted to clamp it when the screws are tightened in washer 109. Thus by loosening the screws 119, relative rotation may be errected between the control stem 89 and the hollow valve stem 97. This is accomplished by applying a screw driver to the slot 127 of the control stern 89. During relative rotation, the washer 113 rotates with control stem 39 while the washer 109 rotates with the valve stem 97, holding with it the dial 115. The dial is indexed as shown at 123, to show angles of adjustment between control and valve stems 89 and 97, respectively, which accord to 20 F. calibration steps (see designations 20 carried on dial 115).

The control stem 89 is prevented from moving axially oy collar-forming horseshoe spring washers or snap rings 125 and 126, snapped into appropriate grooves in the control stem 89. The right-hand one of these (126) becomes located with some clearance adjacent the bottom of the hollow center 79 in the plug valve 77. The left-hand one of these (125) with some clearance is located adjacent washer v113. The sum of the thicknesses of the washer 1113 and dial 115 with some clearance inills the space between the washer 125 and the end of the valve stem 97. The control stem 89, because of said clearances, freely iloats a slight amount with respect to the valve 77, both when the screws 119 are loose for adjustment and when they are tightened after adjustment. Note in this regard that control stem 09 never has any more than a splined connection with the washer 113, regardless of whether or not that washer is or is not clamped to members 109 and 115 by the screws 119. A small pointer 129, having a central collar 131, is press-fitted onto the end of the control stem 89 to indicate in connection with the indexing 123 the angular adjustment between control stem 89 and the valve 77. Numerals 133 indicate lubricant-retention grooves in the control stem 89.

At numeral 135 is shown a sheet-metal platform member, supported on the end of the member 3 by screws 141. Ovcrlying this platform member 135 is a sheet-metal jacket 139, also held in place by screws 141. Parts 135, 139 form a cage for the arbor 105 and the extensions of control and valve stems 89 and 97, respectively. When assembled, the ange 107 of the arbor 105 lies between the platform member 135 and the body 3.

The body portion of the arbor extends through an opening 143 in the platform member 135, which opening is somewhat larger than the diameter of the arbor. This admits an extension sleeve 167 of a control knob K, illustrated in FIG. 13. Adjacent the right-hand end of the arbor 105 is a latch plate 145. This plate has a bentout ear 161 which, with the remainder of the plate, forms a rocking edge 163. This edge is adapted for rocking the plate on the flanged end 107 of the arbor 105.

Spring 101, reacting from valve 77, presses on latch plate 145, normally forcing it flat against the llange 107 and driving another ear 155 thereon into a notch 157 in the plate 135. The latch plate 145 is loosely keyed tothe arbor 105 by ears shown at 106 in FIG. 14. These ears lit loosely in notches 112 in flange 107, so that the plate 145 may rock as required, while being rotatable with the arbor 105. When the arbor 105 is pushed in by means of the extension 167 from handle K, the bent portion 161 of plate 145 engages the adjacent end of body portion 3, thereby rocking the plate 145 and taking the ear 155 out of notch 157, thus releasing the rotary system including valve 77 for rotation in the manner above described in connection with FIG. 8. Ears 108, located on plate 145, are engageable with an ear 110 struck out from platform 135 and provide opposite limits to rotation of the valve 77 and parts attached thereto.

The position of parts shown in FIG. 1, wherein the ear 155 is in the notch 157, corresponds to the closed position of valve 77 (FIG. 8). When out of the notch, counterclockwise rotation of the valve 77 also rotates the stem 89, which through the coupling afforded by pin 94 in slots 92, threads the valve seats 37 and 46 backward, i.e., to the left in FIG. 1, and conversely, upon clockwise rotation threads these seats to the right.- Counterclockwise rotation adjusts for temperature increase lin the space served by burner B and clockwise rotation for temperature decrease.

The safety valve construction S of FIGS. -12 will now be described. This consists of a gas-tight casing 137 with which gas pipe 4 is connected. This casing has an inlet nipple construction 147, connecting line Z with a doublewalled cup 149. This has an outside cup part 151 and an inside cup part 153 marginally connected a-t 159, the space in bulb V,l pipe Zand that between the'cup bottoms 152 and 154 of cups 151 and 153 being in-lled with an expansible uid. T'he movable inner bottom 154 carries a ball support 165 for a ball 169 engaging an adjustable set screw 171 in an operating control arm 173, pivoted at 175 to a xed bracket 177. When bulb V is heated by pilot I, the fluid in system V, Z, 149 presses down the bottom 154 which results in downward movement of the arm 173. When the bulb V is cooled, as when thepilot I is out, the fluid shrinks and arm 173 moves upward under action of a return spring 179. This spring acts on a valve 181 with which the end of lever 173 has a forked connection 183. Numeral 185 indicates a valve seatl for valve 181.l This seat is at the bottom of an adjustable outlet nozzle construction composed of `a slotted.. outlet. cone 187, pressed into a threaded nipple 188, at theferid .of `which is'threaded an adjustable outlet spud member 189. The entir'efsafety valve system S is located so that thespud. member is located at the primary airinlet 191 of the burner B.

Operation is as follows: y

Consider rst -the'preparations required at the time of initial installation. The pilot P is lighted and thereafter burns constantly unless accidentally extinguished. In order initially to adjust the flame with which pilot I is to burn, either constantly or intermittently, the knob K is pushed in to release the latching ear 155 and then turned only slightly to rotate valve 77 anticlockwise (FIGS. 2 and 8). This small amount of rotation is such as to admit gas from 9 Without initiallyshutting oil` port 12 (FIG. 8). The purpose of this is to provide a temporarily continuous flow of gas to pilotI, so that the proper size of its flame vmay be adjusted from valve 63 (FIG. 3), The system is thus prepared for controlled heating operation in both comparatively vhighand low-temperature ranges.

Next operation in use will be considered. Valve 77 is turned counterclockwise to call for heat in, for example,

a comparatively high-temperature range. This would be two routes. The first route may be considered as being through passages 12, 33, 35, outlet 61, pipe X to pilot I, which lights from pilot P. Pilot I under these condi-tions burns constantly. This heats bulb V and, by expansion of lluid in the system V, Z, 149, through ball 169 and screw 6 171 presses down the lever 173. This gradually Opens valve 181.

The other route for gas to ow from the valve 77 is to the passage 15. From here, most of it passes through the hollow threaded bushing 39 into compartment 19, provided valve 71 is open, which it will be if bulb L in a cold condition is calling for heat. A small amount of the gas from main passage 15 passes to compartment 19 through bypassages 23, so that under no circumstances, while valve 77 is open, will burner B be entirely deprived of gas, assuming valve 181 to be open, as is now the case. Since burner B now is receiving gas, it ignites from the constantly burning pilot P. It may be remarked at this point that it the flames of both pilots I and P should accidentally go out, valve 181 would reclose, which constitutes a safety feature, since this would cut off a large outpouring of gas from the burner B. The small amount that would leak from the pilots I and P would not be excessive.

Gas also flows from main passage 15 to compartment 19 under thermostatically regulating control of valve 71, operating with respect to seat 37. This regulated ilow reaches burner B through open valve 181. If L is cool, the part 6 of valve 71 retracts from seat 37, thus supplying more gas; and as L heats, the part 6 of valve 71 approaches seat 37, thus restricting flow of gas. Hence regulation is obtained at the comparatively high-temperature range withoutcompletely shutting off burner B or shutting oi pilot I.

The central portion 8 of valve 71 also approaches and recedes from seat 46, thus variably throttling flow of gas from the center of bushing 39 through the hollow part 44, passage 45, groove 40, passage 33, 35, outlet 61, pipe X to pilot I. Under the high-temperature control conditions envisaged passage 12 is open. Therefore, this sta-ted iow from hollow stem 44 makes little or no difference in the size of the flame at I, as determined by the adjustment at valve 63.

In view of the above, it is apparent that variations in the regulated temperatures in a comparatively high-temperature range are accomplished by turning the handle K, higher temperatures being called for by counterclockwise movements, which back off the seat 37 to admit more gas to the burner B for a given range of movement ofthe valve 71. Reduced temperatures in the high-temperature range are obtained by clockwise movements of the handle K.

If K is turned sufliciently to reach a certain comparatively lower temperature range, a condition occurs in which the member 87 (FIG. 8) covers port 12. This happens before the inlet port 9 is covered and has a double effect. First, it cuts oil the flow of gas which is received by pilot I from port 12. Pilot I then relies for its gas upon that which flows to it via the hollow member 44 of bushing 39, passage 45, groove 40, passages 33, 35, outlet 61 and pipe X, which gas route is under control of the action of the center port 8 of the valve 71 in respect to the seat 46 around the end of hollow member 44.

In turning valve 77 to the right (FIG. 8) the bushing 39 is advanced to the right, thus causing valve 71 in the low-temperature range of settings to effect a complete shut-olf of gas in response to overheat. This shut-oft" occurs in respect to the supply for pilot I and the casing S. In other words, complete shut-olf occurs in response to overheating beyond the selected temperature in the lowtemperature range. As a result, when pilot I becomes extinguished the liquid in the system V, Z, 149 shrinks, thus through 169, 171 and 173 closing valve 181. Hence burner B cannot receive gas. Upon cooling of the space being heated, the bulb L cools which shrinks the liquid in the system L, Y and between cup bottoms 49 and 51 (FIG. 1). This reopens the valve 71, which again supplies gas across seat 37 to casing S and across seat 46 to pilot I. Pilot I relights from constantly burning pilot P, which again starts the cycle of opening of valve 181 and ignition of burner B.

Thus it will be apparent that under high-temperature control settings of the valve 77, the valve ll is constantly open by reason of the constantly burning condition from ame pilot l. The entire control is then of the modulating type caused by movements of the valve 71 to and from bushing 39. Under these conditions, burner B never goes out, even though the valve 71 may closely approach seat 37, noting that the by-pass gas through passages 23 prevents burner B from ever being extinguished by reason of gas starvation.

On the other hand, under low-temperature control settings of the valve (passage 12 closed), the burner alternately lights and is extinguished through the action of valve 71 seating and unseating on the seats 37 and 46. Upon seating, casing S is deprived of gas and so is the pilot l, which latter event results also in the closing of valve lSl. Upon cooling, the valve 7l retracts from the seats 37 and 45, thus supplying casing S with gas and supplying the pilot I with gas which is ignited from constantly burning pilot P. The heated system V, Z, 1429 then gradually reopens valve 181 to supply burner B with gas which ignites from the constantly burning pilot P.

Summarizing, the system described provides first for modulation of the burner B in the high-temperature range by varying its fiarne without its being extinguished. Second, it provides for modulation of the burner B in the low-temperature range by intermittently igniting and extinguishing it by reason of the intermittent ignition and extinguishment of the intermittent pilot I and the complete opening and closing of valves 7l and 181. Third, the system provides the safety closing feature of the valve Sl under both highand low-temperature operation, i.e., under any conditions in which both intermittent pilot I and pilot P are extinguished. Fourth, the comparatively slow opening and closing action of the control and safety valve 81 modulates the on-off gas fiow for smoother control, and the slow opening action particularly prevents an undesirable explosive or puff type of ignition at burner B under low-temperature control conditions.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

We claim:

l. A gas regulator comprising a housing having an inlet, a main passage in the housing, a main outlet, a first auxiliary passage and a second auxiliary passage in the housing and an auxiliary outlet, a manual valve controlling flow of gas from the inlet to the main passage and also controlling ow of gas from the inlet through said rst auxiliary passage to the auxiliary outlet, said manual valve adapted in a first range of opening positions thereof to cut off flow from the inlet through said first auxiliary passage to the auxiliary outlet while communicating the inlet with the main passage, and in a second range also to communicate the inlet through said first auxiliary passage with the auxiliary outlet, thermostatic valve means having two movable valve seats and a movable valve member controlling gas flow from the main passage to the main outlet through one seat and from the main passage to said auxiliary outlet through the other seat and said second auxiliary passage, drive means connecting the manual valve and said valve seats adapted to adjust the latter, said movable valve member when said manual valve is set in said second range being adapted 'thermo` statically to vary gas liow by movement without entirely `closing on both of said seats and when said manual valve is set in said first range to vary gas flow by movement with intermittent complete closing on both of said seats. 2. A gas regulator according to claim l, including a by-pass connection communicating between the main passage and said main outlet.

3. A gas regulator system comprising a rst constantly burning pilot burner, a. main burner and a second pilot burner both of which Iare adapted to be ignited from the first pilot burner, a first valve controlling gas fiow to the main burner, a thermostatic control means adapted in response to heat from said second pilot burner to open said first valve and to shut said valve when the second pilot burner is extinguished, a valve housing having an inlet, a main passage in the housing, a main outlet connected with said first valve, a first auxiliary passage `and a second auxiliary passage in the housing and an auxilary outlet connected to said second pilot burner, a manual valve controlling flow of gas from the inlet to the main passage and also controlling flow of gas from the inlet through said first auxiliary passage to the auxiliary outlet, said manual valve adapted in a first range of opening positions thereof to cut off fiow from the inlet through said first auxiliary passage to the auxiliary outlet while communicating the inlet with the main passage, and in a second range also to communicate the inlet through said first auxiliary passage with the auxiliary outlet, thermostatic valve means controlling gas flow from the main passage to the main outlet and from the main passage to said auxiliary outlet through said second auxiliary passage, drive means connecting the manual valve and said thermostatic valve means adapted to adjust the latter, said .thermostatic valve means when said manual valve is set in said second range being adapted to vary gas iow by movement without entirely closing and when said manual valve is set in said first range to vary gas flow by movement with complete closing.

4. A system according to claim 3, including a bypass connection communicating between the main passage and said main outlet.

5. A system according to claim 3, wherein said thermostatic control means is of the slow-acting variety adapted gradually to open said first valve controlling fiow to the main burner to prevent explosive ignition at the latter.

6. A gas regulator system comprising a first constantly burning pilot burner, a main burner and a second pilot burner both of which are adapted to be ignited by the first pilot burner, a first valve controlling gas flow to the main burner, a gradually movable thermostatic control means adapted in response to heat from said second pilot burner gradually to open said first valve and to shut said valve when the second pilot burner is extinguished, a valve housing having an inlet, a main passage in the housing, a main outlet connected with said rst valve, a first auxiliary passage and a second auxiliary passage in the housing land an auxiliary outlet connected to said second pilot burner, a manual valve controlling ow of gas from the inlet to the main passage and also controlling flow of gas from the inlet through said first auxiliary pass-age to the auxiliary outlet, said manual valve adapted in a first range of opening positions thereof to cut off flow from the inlet through said first auxiliary passage to the auxiliary outlet while communicating the inlet with the main passage, and in a second range also to communicate the inlet through said first auxiliary passage with the auxiliary outlet, thermostatic valve means having movable valve seats and a movable valve member therefor controlling gas fiow from the main passage to the main outlet through one seat and from the main passage to said auxiliary outlet through the other seat and said second auxiliary passage, drive means connecting the manual valve and said valve seats adapted to adjust the latter, said movable valve member when said manual valve is set in said second range being adapted to vary gas flow by movement without entirely closing on both of said seats and when said manual valve is set in said first range to vary gas fiow by movement with complete intermittent closing on both of said seats.

7. A thermostatic gas valve comprising a hollow body having an inlet, a main outlet and an auxiliary outlet, a threaded passage between the inlet and main outlet, said body having a port connecting the threaded passage with said auxiliary outlet, a rotatable tubular member threaded into said passage, the exterior of said tubular member having an external groove communicating in its Various rotary positions with said port, said tubular member having two annular valve seats, one within the other, said tubular member being in the form of a flanged cup, the flange of which carries the outer seat, said cup having a central hollow stem the end of which carries the inner valve seat, said cup having an inside radial support for the stem, said support having at least one opening between said central hollow stem and the outer wall of l() said tubular member adapted to pass gas through the tubular member, the support also containing a passage between said groove and said hollow stem, and a thermostatically controlled valve member movable to and from said tubular member and having means engaging said seats.

References Cited in the le of this patent UNITED STAS PATENTS 2,153,886 Grayson Apr. 11, 1939 2,214,272 Dillman Sept. 10, 1940 2,245,060 Waddell June 10, 1941 2,610,680 Witzel Sept. 16, 1952 2,807,423 Eskin Sept. 24, 1957 UNITED STATES P ITENT oFFICE CERTIFICATE 0F CORRECTION Patent No 3,065913 November 2, 1962 Walter IIo HoIzboog et 11o -It is hereby certified that error appears in the above numberec'l patent requiring correction and that the said Letters Patent should read as corrected below.

Column 6, line 34, afzel.n "'envisaged" insert a comma;

line 69, aftereools insert a comme; column 7 line l2, after .'Tvalve" lnsert 77 Signed and sealed this 21stv day of May 1963.

(SEAL) Attest:

ERNEST w. SWIDER- DAVID L- LADD Attesting Officer Commissioner of Patents

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