US2284995A - Floor furnace valve - Google Patents

Description

June 2, 1942. c. s. STUCKENHOLT FLOOR FURNACE VALVE Filed June 27, 1941 2 Sheets-Sheet 1 A TTORNEYS.

June 2, 1942. c. s. STUCKENHOLT 2,284,995

FLOOR FURNACE VALVE Filed June 27, 1941 2 Sheets-Sheet 2 J9 45' 45 34 a4 26 MM 5 5 7-505 51 44 44 v 55 A TTORNEYS.

Patented June 2, 1942 FLOOR FURNACE VALVE Casper S. Stuckenholt, Cleveland, Ohio, assignor to The W. J.

Schoenberger Company, Cleveland, Ohio, a corporation of Ohio Application June 27, 1941,'Scrial No. 400,087

4 Claims.

This invention relates to improvements in valves, being particularly directed to valves for use with floor furnaces.

The conventional floor furnace construction comprises a cast manifold upon which is mounted two valves for supplying gas to a pilot and main burner respectively. In order to meet requirements of the American Gas Association laboratory, to the effect that means must be provided for preventing the main burner valve from being turned on before the pilot valve, it has been the practice to employ valves with special swivels and a locking plate connecting one valve with the other. The use of the two valves embodying such special features as the locking plate and swivels has proven expensive and otherwise somewhat unsatisfactory.

One of the general objects of the present invention is to provide a single valve capable of meeting the aforesaid requirements thus eliminating the locking plate.

A further object of the invention is to provide a valve of the above character with means for providing a high or a low volume flow of gas to the main burner.

A further object of the invention is to provide means whereby the single valve is adapted for use either with an automatically or manually operated furnace.

Other objects and advantages will be apparent as the description is considered in connection with the accompanying drawings wherein:

Figure 1 is a plan view of the improved plug valve -as used with a manually controlled furnace;

Figure 2 is a section taken on line 22 of Figure g Figure 3 is a side elevation of the valve;

Figure 4 is a section taken on line 4--4 of Figure 1;

Figure 5 is a section taken on Figure 3;

Figure 6 is a plan view of the slotted valve;

Figure 7 is a fragmentary section of the slotted valve;

Figure 8 is a side view of the slotted valve;

Figure 9 is a plan view of the improved plug valve;

Figure 10 is a side view of the improved plug valve;

Figure 11 is a side view of the plug valve;

Figure 12 is a sectional view taken on line l2--l2 of Figure 10;

Figure 13 is a sectional view taken on line I3-l3 of Figure 10;

the line 55 of Figure 14 is an end view of the adjustable needle valve;

Figure 15 is a side view of the needle valve;

Figure 16 is a plan view of the lock washer;

Figure l'l'is a section on line ll-l'l of Figure 16;

Figure 18 is a bottom view of the flanged cap member;

Figure 19 is a perspective view of the flanged cap member;

Figure 20 is an end spring;

Figure 21 is a side view of the spring shown in Figure 20;

Figure 22 is a plan view of the locking plate:

Figure 23 is a side view of the locking plate;

Figure 24 is an end view of the valve stem;

Figure 25 is a partial sectional view of the valve stem swivel and operating rod;

Figure 26 is a diagrammatic view of the improved valve and connections for use with the thermostatic safety valve and associated parts of an automatically controlled furnace; and

Figure 27 is a fragmentary sectional view of the improved plug valve with the slotted needle valve and pipe assembled for use with an automatically controlled furnace.

Referring more particularly to the drawings the improved valve comprises a preferably cast valve housing or casing I, having therein a ver-- tically disposed tapered plug receiving bore 2. Projecting rearwardly at right angles to the bore 2 is an enlarged hollow gas inlet extension 3, interiorly threaded as at 4 and provided with an upwardly extending fastening flange 5. The extension 3 is adapted to be threadedly connected with the house gas supply line 64 of a manually controlled furnace, not shown, and the flange 5 is provided with screw openings 6, to facilitate securing the valve to a suitable support such as the wall of a furnace, not shown.

Projecting outwardly from the front of the casing l, is a horizontally disposed hollow exten-- sion 1 axially aligned with the bore of rearwardly extending hollow extension 3. The outer end of the extension I is provided with an adjustable threaded perforated cap 8, through which gas will flow to the main burner, not shown, of the manually controlled furnace referred to above. These oppositely projecting hollow extensions 3 and 1 communicate with the plug receiving bore 2 at their outer and inner ends respectively, through aligned oppositely disposed openings 22 and 23 in the casing.

A pair of parallel extensions or nipples 9 and view of the plug valve coil l extend outwardly from the right side of the casing, when looking toward the front end of extension 1. The nipple 9 is adapted for connection with a conventional pilot light, also not shown, 01' a main burner 10, tor a manually con-- terior of hollow gas inlet extension 3, by means of a transverse passage H in axial alinement 20 when the plug valve is appropriately rotated. In operation the valve plug is manually rotated by means of a valve stem 28 having its with the well 01' nipple i0, serves as a means for adjusting the rate or gas flow from the nipple III, to the plug valve l6, through an inwardly and forwardly inclined passage 25, and finally through nipple 9 to the pilot burner. Thus the nipple I0 is provided with a needle valve l2 which is in turn entirely enclosed and protected by means of a cap I3. This needle valve regulates or adjusts the amount of gas flowing from inlet extension 3 into nipple I0 through transverse passage II and thence out through inclined passage 25, in an obvious manner.

A second adjustment nipple l4, projecting from the left hand side of the casing, or in a direction opposed to the pilot adjustment extension or nipple I0, provides for a predetermined low or simmer flame at the main burner when the valve is moved to reduced flow or simmer position. This nipple I4 is internally threaded to receive a needle valve l5, similar to the valve I2. Gas flowing into the nipple l4, through an inclined passage [6, leading from hollow extension 3, to the well of nipple l4, continues through a horizontally disposed axial passage l1 leading inwardly from the nipple to plug receiving bore 2, and finally to the apertured outlet nipple or extension 1, in a manner presently described. The volume of flow can be reduced to any desired predetermined minimum by screwing the needle valve inwardly in an obvious manner. A cap 26 encloses and protects the needle valve l5 against tampering.

The tapered plug or valve [8 is adapted to be snugly but rotatably received in the tapered bore 2 of the casing l. The valve plug is formed with a large transverse opening l9, approximately midway of its length, and with a relatively small transverse opening leading to the larger opening I 9. The opening 20 extends at right angles to the opening or passage l9 and in a plane which bisects the axis of the latter approximately midway its length. The plug is also formed with a peripheral groove or passage 2|, extending around the lower end of the plug approximately 270 and is spaced downwardly-a substantial distance from the plug openings or passages I9 and 20. When the plug is seated in the bore 2, the groove 2| therein will lie in a common plane with the inner ends of axial passage 24 and inclined passage 25, leading respectively from bore 2 to nipple 9 and from nipple III to bore 2, so that these passages 24 and 25 will be in the path of movement of the groove. Likewise the aligned main inlet and main outlet openings 22 and 23 leading from the hollow extension 3 to the bearing surface of the plug receiving bore 2 and from the bore to and through the passage 50 of extension 1, respectively lie in the path of movement of and are adapted to be brought into and out of register with the plug passages l3 and lower or inner end extending into and interengaging with a hollow extension 29 formed on the outer end of the plug, the stem being provided with a socket member 30 swiveled thereto by means of pin 30. The member is formed with a'squared. opening 3|, adapted to receive the correspondingly squared lower end of a conventional and relatively long operating rod or handle 58, which is manually manipulated from the floor above. The movable socket member 30 facilitates the operation of connecting the long rod 58 to the stem and also affords sufiicient flexibility to prevent the valve from binding during movement from one station to another. Hollow extension 29 is formed with two oppositely arranged slots 32 and 33 of difl'erent width to slidably receive finger portions 34 and 35 integrally formed on the inner or lower end of stem 28, when the latter is partially inserted within the hollow extension against the tension of a coil spring 39, seated in the hollow extension. The finger portions are proportioned to flt the slots 32 and 33 and are of different width to insure proper assembly. A locking plate or member 40 seated on the coil spring between the latter and the end of the stem, is formed with fingers 44 and 45 of different length and width adapted to be forced into interlocking engagement with the slots 32 and 33 by the stem.

A flanged apertured cap member 36 sleeved over the valve stem is formed with a depending flange 36" having apertured ears 3'! and 31' which seat upon and are secured to laterally extending apertured lugs 38 and 38' formed on the upper face of outer end of the casing I. A safety lock washer 46 is interposed between the cap member 36 and the end face of the casing for a purpose presently described. The forwardly facing portion of the cap flange 36' is formed with a cut away portion or recess 4| approximately midway between the two apertured ears 31 and 31' and adjoining this recess in stepped relation thereto is a second and deeper cut out portion or recess 42 which extends to the apertured ear 31'. One end of the recess 4| serves as a stop shoulder 43 for limiting movement of the valve in a clockwise direction when the elongated arm 44 of the locking plate 40, is moved thereagainst. The cap 36 is also formed with a depression 41 at the point of juncture between the depending cap flange 36* and the apertured ear 31' and the inwardly or rearwardly facing portion of the flange is formed with a cut away portion or recess 48. The recess 42 and the depression 41 serve to respectively lock and resiliently latch the valve against movement in either direction when the locking and latching plate 40 reaches these respective stations, while one end 49 of the cut away portion 48 serves as a stop wall to prevent further anticlockwise rotation of the valve when the latter is in position to permit a low flow of gas to the burner.

When the valve is in off or inactive position the arm 44 engages the stop shoulder 43 of recess 4| first active position and in which a reduced flow of gas is delivered to the pilot light connection or nipple 9. The pilot gas enters hollow casing extension 3 from the main gas line 64 and thence flows into nipple l through small transverse passage axially aligned therewith. From nipple H) the pilot gas flows through the inwardly and forwardly inclined passage 25, leading from the nipple Ill and through the bearing surface of the vertical plug receiving bore 2, formed in the casing I, where it is picked up by the plug slot or groove 2| whichalso communicates with the transverse passage 24 leading from the bore 2, to the nipple 9. Manual adjustment of the pilot flow, to compensate for different pressures and kinds of gases encountered in various localities, can be readily made by removing the'cap |3 from nipple l0 and screwing the needle valve l2 into or away from the outlet end of passage according to whether it is desired to reduce or increase the flow of gas to the pilot light.

In order to rotate the valve to its second active or full on position, in which a full flow of gas is delivered to the main burner, the stem must be moved inwardly in an axial direction untilthe arm 44 clears the right hand wall of recess 42.

whereupon rotation of the valve in an anti-clockwise direction is continued until the operator is apprised, when he hears a slight clicking sound caused by the arm 44 being forced into the depression 41, that the desired full flow station has been reached. A full stream of gas from inlet extension 3 will now flow through transverse plug passage l9, which is aligned with and places the plug inlet and outlet openings 22 and 23 in communication with each other, and thence through the apertured extension I to the burner. In this position the long arm 44 of plate 40 is resiliently latched in the depression 41 and the previously described flow of gas to the pilot continues.

Still further rotation of the valve plug in an anti-clockwise direction may be eflected by merel'y overcoming the resistance offered by the resiliently pressed arm 44 against movement out of its latching position against the tension of spring a 39. When the arm 44 engages the previously described shoulder 49 at one end of the cut away portion or recess 48, anti-clockwise rotation of the plug will be definitely stopped. Gas will now flow from main inlet 3 through the small forwardly and outwardly inclined passage l6 leading from the inlet 3 to the predetermined low flow adjustment nipple l4 and thence inwardly through an axial or transverse passage |'I leading from the nipple H to the interior or large passage I9 of plug I8 and finally out through the small plug opening 20. The latter, at this time registers with the outlet opening 23 in the casing leading to the gas passage 50 in extension I, which in turn is connected to the main burner. We now have a predetermined reduced flow of gas to or predetermined low flame at the main burner with gas also flowing to the main burner pilot. While the max mum flow of gas to and through the fitting or extension 1 in this position is much less than when the valve is in full or high position, any desired or finer minimum low flow adjustment may be made by merely removing the cap 26 and screwing the adjustment valve l5, in an appropriate direction.

It will be understood that when the valve plug 2 is in ofi' or closed position, the small plug opening or passage 20, of the plug I8, will register with the gas inlet extension 3 and the low flow adjustment nipple or well M respectively. It will also be noted that in this position, the large passage i9 will be out of register with the opening 23 leading to passage in extension I, the opening 23 being thus closed. At the same time, it will also be noted that forwardly and inwardly inclined passage 25 leading from pilot flow adjustmentnipple H), to the plug receiving bore 2, is closed or blocked at the bore by that solid space or area 59 of the plug extending between the opposite ends of the groove 2|, and consequently no gas can flow to either the pilot or main burner.

In the first active or pilot position the transverse passage leading from the low flow adjustment nipple I4 to the plug bore is closed by the area or space 66 .between the small passage 20 of the plug and one end 6| of the larger plug passage IS, the small passage 20 being located somewhat closer to the end 6| of passage l9 than to the other end 62 thereof. Flow of gas from nipple I4 is thus closed and therefore no gas can reach the extension 'I or main burner from this source. The small opening 20 will also have been moved slightly in a clock-wise direction out of register with the opening 22 connecting inlet 3 with the casing bore 2 and the larger area or space 63 between the small bore 20 and the end 62 of passage l9, will close the passage 23 leading to extension and thence to the main bumer. However the groove 2| will now bridge the space between the passages 24 and 25 and permit gas from inlet 3 and nipple ID to reach nipple 9 and the pilot.

In the second or full flown position the passage t1 leading from nipple M to the bore 2 is closed by the space 63 and the full flow casing-and plug passages will be in alinement with each other thus permitting a full flow of gas direct from inlet 3 to the burner. As the plug groove 2| continues to bridge the pilot flow passages 24 and 25 gas continues to flow to the main burner pilot.

Further movement of the plug about ninety degrees in an anti-clockwise direction moves the plug to its third active or low flow position with the end 62 of passage I9 out of register with the full flow passage 22 and into register with the low flow passage ll, without disturbing the communication between the plug groove 2| and the pilot flow passages 24 and 25. The small low flow plug opening or passage 20 will now register with outlet passage 50 in extension I. A reversal of the above described operations will take place during return movements of the valve through full on and pilot flow back to closed position.

The lock washer 46 previously referred to herein, is provided with apertured ears 56, corresponding to the apertured ears 31 and 31' on the cap 36, to facilitate assembly on the casing lugs 38 and 38'. The washer 46 is also formed with a depending horizontally disposed flange 5|, which is provided with a cut out portion or notch 51 corresponding in size to and in vertical alinement with the locking notch 42 of the cap 36, Considerable difliculty was experienced with the present valve, prior to the adoption of the lock washer, due to the fact that when shifting the valve stem axially in order to turn the valve plug from one station to another, the operator would frequently miss the desired station. This was due to the fact that because of the necessity of operating the valve from a distance, through the medium of the long heavy and unwieldy rod 58, previously mentioned herein, it was impossible for the operator to hear the clicking of the locking plate 40, or to otherwise accurately determine the exact location of the arm 44 of this plate. By providing the flanged locking washer, it becomes necessary for the operator to feel for the desired position thus obviating the likelihood of inadvertently passing the desired station by pressing down too hard on the rod 58, connected to the valve stem. As an illustration, when the plug valve is in the first active or pilot flow position the long arm 44 of the plate 40 is seated in the locking notch' 42, directly over the notch 51 in the flange of the lock washer. Consequently if much. pressure is exerted on the operating rod or handle 58 the arm 44 will be forced into locking notch 51 and the valve will remain locked, and the operator will be definitely apprised as to position and therefore can, by the exercise of reasonable care, rotate the valve plug with certainty to any other desired active or in active position. Up to this point the specification corresponds with that of my co-pending application filed of even date herewith, Serial No. 396,765.

It frequently happens after a furnace has been in use for some time, that the user desires to install an automatic control, such as diagrammatically illustrated in Figure 26, in lieu of the manual control with which the furnace was originally equipped. These automatic controls include a conventional safety cut oil? thermostatically controlled valve 65, in the main gas supply line 64, and through which gas must flow enroute to the casing inlet extension 3 and thence to the burner Ill. Gas taken from line 64 in advance of the inlet side of safety valve 65 reaches nipple 9 and pilot light 61 in a manner presently described. The safety valve 65 shuts off the main supply of gas to a pipe 66, adapted for connecting the outlet side of this valve with the casing inlet 3, until a thermostatic element 68 of the automatic control becomes heated and opens the safety valve. In other words gas is not permitted to flow to the main burner until after the pilot has been lit sufficiently long to heat the automatic control. Therefore it is extremely advantageous that the floor furnace equipment be provided with means whereby it is possible to conveniently convert from a manual to an automatic control. The pilot 6'! serves to light the main burner 10 in addition to its other functions.

In order that the present invention may function with either type of control I provide the casing nipple It] with a special slotted screw 52 and bushing 55 which can be readily substituted for the adjusting screw or needle valve l2 and cap I3 respectively, the method of assembly being as follows: The cap l3, used on spud or nipple In, for enclosing and protecting the pilot adjusting screw valve l2, as well as the screw l2 are removed from nipple I0 and the slotted screw 52 is then screwed home in the nipple I0, until the inner pointed end 56 of the screw 52 seats in and closes the transverse or axial passage ll, thus cutting off all flow of pilot gas from inlet extension 3 to nipple Ill. The special bushing 55 is then assembled in place of the cap l3, and a delivery pipe 55 leading from the main gas line 64 ahead of the automatic control for main fiow of gas through pipe 56, is then attached to the bushing. As screw 52 is formed with a longitudinal slot 53 which communicates at its inner end with the well of nipple l0 and at its outer end with a transverse slot 54 in the head thereof, it follows that when the valve plug 2 is turned to its first active position pilot gas will flow from the delivery pipe 55' inwardly to the bushing 55 and through the slot 53 to the bottom of nipple I0 and thence through the inclined passage 25 to plug groove 2| and finally through transverse passage 24 and pipe 21' to the pilot 61. And since the pilot gas delivery pipe 55' is connected to the main gas line ahead'of the automatic control valve 65, which prevents flow of gas to inlet extension 3 until the pilot is lit, flow of pilot gas to .the pilot will be uninterrupted. The pilot may now be lit and after the safety control element has been heated sufficiently to actuate the automatic valve forming part of the automatic control, the line 66 leading to extension 3 will be opened and gas will fiow to the main burner in the manner previously described as taking place under manual control conditions.

In most cases the valve will be equipped at the factory with the needle valve I2 and the slotted screw or fitting 52 shipped as an auxiliary modified part. However for original installations on furnaces with automatic controls the fitting 52 will be installed at the factory and the needle valve I2 omitted entirely.

If deemed desirable the slotted screw 52 may be employed regardless of whether the valve is expected to be used with furnaces having a manual or an automatic control, care being taken in the case of manual control furnaces that adjustment of the screw 52, be such that flow of gas from extension 3, through restricted passage I I, is not completely shut off. Of course the cap l3 must be screwed onto the nipple to prevent the escape of gas when nipple I0 is not directly connected to the gas line, whereas this is not absolutely necessary where the adjustment valve I2 is used. However the screw adjustable valve 52 will function effectively when gas to the pilot light is supplied either direct from the gas line to the nipple ID or from inlet 3, except that the needle adjustment of pilot gas flowing directly from the gas line to the nipple cannot be effected. In either case the construction of the casing and plug valve will remain the same, although it will be understood that the fitting 52 is adapted for use with valves having variously modified flow positions where it is desirable to have the inlet extension 3 and the nipple l0 connected at different places in the gas supply line relatively to a safety control or other element in the line.

Having thus described my invention:

What I claim is:

1. In an valve for floor furnaces having a piloto light in the main gas line, a casing formed with a plug receiving bore, a plug having a rotatable bearing in said bore, said casing having inlet and outlet connections leading to and from said bore respectively, said inlet connection being adapted for connection with the main gas supply line and said outlet connection being adapted for connection with the mixing tube of the burner of the furnace for conducting gas thereto, said casing having a pilot light extension provided with a restricted passage leading thereto from the bore, said extension leading to the pilot light for the main burner, a hollow nipple formed on the casing adjacent said pilot extension and having restricted passages leading therefrom to 7 said bore and thereto from said inlet connection respectively, said nipple having an open outer end adapted for direct connection with the main gas line, a threaded needle valve in the pocket for regulating or shutting off the flow of gas through the said restricted passage leading from said inlet connection to said pocket leaving open said restricted passage leading from said pocket to said bore, said plug having an arcuate peripheral slot and a cross passage therein, said restricted passages leading from the nipple to the bore and from the bore to the pilot extension being bridged by said arcuate slot and the said inlet and outlet connections being in the path of movement of said cross passage such that when the plug is rotated from a closed position to its first active position a reduced flow of gas may flow direct from the gas line to said pocket and bore and thence through said arcuate slot into said outlet pilot light extension, the flow of gas to the outlet connection being blocked by the plug and such that when the plug is rotated to another active position a full volume of gas may flow from the inlet connection through the large cross passage into the plug to and through the outlet connection while reduced flow to said pilot light extension continues.

2. In a valve for floor furnaces having a main gas supply line and a pilot light and a burner in said line, a casing with a plug receiving bore, a plug having rotatable bearing in said bore, said casing having inlet and outlet extensions leading to and from said bore respectively, said inlet extension being adapted for connection with said gas line and said outlet extension being adapted for connection with the mixing tube of the furnace burner for conducting gas thereto, said casing having a second outlet extension communicating with the plug receiving bore for conducting gas to the pilot light, a hollow threaded nipple on one side of the casing forming a pocket, means for placing said pocket in direct communication with the gas line, said pocket having a restricted passage leading to said inlet extension, a threaded adjustment screw adapted to regulate the flow of gas through said restricted passage to the pocket from the said inlet while permitting gas to flow into said pocket direct from said gas line, said plug having an arcuate slot and a cross passage, said slot placing said bore and pocket and said second outlet extension in communication with each toher, and said first mentioned inlet and outlet extensions being in the path of movement of said cross passage such that when the plug is rotated from a closed position to its first active position a reduced flow of gas will flow from said pocket to the said second outlet extension, the flow of gas to the first outlet extension being blocked by the plug, and such that when the plug is rotated to its second active position a full volume of gas may flow from the inlet extension through the cross passage in the plug to the first outlet extension while reduced flow to said second outlet extension continues.

3. In a valve for floor furnaces having a main gas supply line and a pilot light and a main burner in said gas line, a casing with a plug receiving bore. a plug having rotatable bearing in saidbore, said casinghaving inlet and outlet extensions leading to and from said bore respectively, said inlet extension being adapted for connect on with said gas line and said outlet extension being adapted for connection with the mixing tube of the furnace burner for conducting gas thereto,

said-casing having a second outlet extension communicating with the bore for conducting gas to the pilot light, a nipple on one side of the cusing forming, a pocket and having an open outer end, means for placing the outer end of the nipple in direct communication with the gas line, said nipple having a restricted inlet passage communicating with the inlet extension and a restricted outlet passage leading to the bore, threaded means mounted in the open outer end of said nipple for regulating the flow of gas from said inlet extension through said restricted inlet passage, said means only partially closing said open outer end whereby gas may flow direct to said pocket from said gas line, said plug having an arcuate slot and a cross passage, said slot placing said bore and pocket and said second outlet extension in communication with each other, and said first mentionedinlet and outlet extensions being in the path of movement of said cross passage such that when the plug is rotated from a closed position to its first active position a reduced flow of gas will flow from said pocket to said second outlet extension, the flow of gas to the first outlet extension being blocked by the plug and such that when the plug is rotated to its second active position a full volume of gas may flow from the inlet extension through the cross passage in the plug to the first outlet extension while reduced flow to said second outlet extension continues.

, 4. In a valve for fioor furnaces having a main gas supply line and a pilot light and a main burner in said gas line, a casing with a plug receiving bore, a plug having rotatable bearing in said bore, said casing having inlet and outlet extensions leading to and from said bore respectively, said inlet extension being adapted for connection with said gas line and said outlet extension being adapted for connection with the mixing tube of the furnace burner for conducting gas thereto, said casing having a second outlet extension communicating with the bore for conducting gas to the pilot light, a nipple on one side of the casing forming a pocket and having an open outer end, means for placing the outer end of the nipple in direct communication with the gas line, said nipple having a restricted inlet passage communicating with the inlet extension and restricted outlet passage leading to the bore, an adjustable screw valve mounted in the open outer end of said nipple for regulating the flow of gas from said inlet extension to said pocket through said restricted inlet passage, said valve having a head portion formed with a transverse slot and a communicating longitudinal slot leading to said pocket whereby gas may flow direct to said pocket from said gas line, said plug having an arcuate slot and a cross passage, said arcuate slot placing said bore and pocket and said second outlet extension in communication with each other, and said first mentioned inlet and outlet extensions being in the path of movement of said cross passage such that when the plug is rotated from a closed position to its first active position a reduced flow of gas will flow from said Pocket to said second outlet extension, the flow of gas to the first outlet extension being blocked by the plug and such that when the plug is rotated to its second active position a full volume of gas may flow from the inlet extension through the cross passage in the plugto the first outlet extension while reduced flow to said second outlet extension continues.

CASPER S. STUCKENHOLT.

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