US1797118A - Valve construction - Google Patents

Description

March 17, 1931. G. F. BEACH 1,797,113

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VALVE CONSTRUCTION Filed Nov. 9, 1926 v7 Sheets-Sheet 5 March 17, 1931. BEACH 1,797,118

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VALVE CONSTRUCTION Filed Nov. 9, 1926 7 Sheets-Sheet 5 March 17, 1931, BEAH 1,797,118

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G. F. BEACH VALVE CONSTRUCTION Filed Nov 9, 1926 Sheets-Sheet '7 Patented Mar. 17, 1931 U'lTED STATES PATENT OFFICE GEORGE F. BEACH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO RYAN, SCULLY & COMPANY, OF PHILADELPHIA, EENNSYLVANIA,

A CORPORATION OF DELAWARE VALVE CONSTRUCTION Application filed November 3, 1926. Serial No. 147,265.

My invention relates to valves, and it has for one object the provision of a valve structure comprising a pair of valves and oper ating means affording adjustments in one or the other or both of said valves.

A more specific object of my invention is to provide means for maintaining constant operating conditions in a furnace or other heat-generating device, wherein liquid or gaseous fuel is burned for the generation and utilization of heat, that shall be characterized not only by its accuracy and dependability of operation but also by its ruggedness of construction and accessibility of parts for repair.

Another object of my invention is to provide apparatus of the character described com} rising a valve having a control disk, and means for adjusting the closed position of said disk, whereby a continuous flow through said valve may be assured sufiicient for example, to maintain'proper combustion conditions when only the furnace losses are to be supplied.

Other objects and applications of my invention, as well as details of construction and operation, whereby my invention may be practiced, will be apparent more fully hereinafter when taken in connection with the accompanying drawings, wherein Figs. 1 and 2 are side and end elevational views, respectively, of a valve structure embodying my invention, wherein the parts are so adjusted that the valves are unaffected by the operation of the solenoid;

Fig. 3 is a view similar to Fig. 1, but showing the adjustable parts in their normal working position, with the solenoid de-energized and the butterfly valve partly opened to insure the desired minimum flow therethrough Fig. 4 is an enlarged, detail side elevational view of the structure of Fig. 3, illustrating the position of the parts when the solenoid is energized;

5 is a transverse sectional view taken on the line 5-5 of Fig. 4;

Fig. 6 is an enlarged detail vertical sectional view taken on the line 66 of Fig. 3;

Fig. 7 is an enlarged side elevational view of the butterfly valve and associated operating mechanism;

Fig. 8 is a transverse sectional view taken on the line 88 of Fig. 7, but showing the valve disk in its fully opened position;

Fig. 9 is a similar view, the sectional plane being taken on the line 99 of Fig. 7;

Fig. 10 is a detail vertical sectional view, taken on the line 1010 of Fig. '7 f F ig. 11 is an enlarged vertical sectional view of the bull and by-pass valve group, the sectional plane being taken on the line 11-11 of Fig. 3; and

Fig. 12 is a vertical sectional View of a modified form of packing for the lower valve section of Fig. 11.

Referring to the drawings, the valve apparatus therein [shown comprises broadly a butterfly type of valve 1 for controlling the flow of air; a fuel valve 2 having an independently hand-controlled by-pass valve 3; a solenoid a responsive to the temperature conditions in a furnace "or thepressure conditions of a boiler; and operating mechanism 5 for the air and'fuel valves 1 and 2 responsive to the energization and de-energization of the solenoid 4. Since the specific details of the electrical circuit connecting the solenoid 4 with a furnace or a boiler or other apparatus to be controlled form no part of the present invention, a description thereof is deemed unnecessary.

The butterfly valve 1, particularly as illustrated in Figs. 7 and 8, comprises an elongated main cylindrical casing 6 defining a passage 7 extending between openings 8 and 9 respectively positioned at opposite flanged ends 11 and 12. The passage 7 may be extended by means of a reducing coupling 13, a flanged end 14; of which is secured by bolts 15 to the adjacent flanged end 11 of the main casing 6. An opposite end 16 of the coupling 13 is also provided with a flange 17, afford ing a connection to the supply pipe 18. Should it be more desirable to cause the air or other fluid to pass through the passage 7 in the opposite direction, the supply pipe 18 is connected to the flange 12 of the maincasing 6 rather than to the flange 17 of the coupling 13.

The flow through the passage 7 may be controlled by a valve disk 19 which is pinned to a shaft 21. The ends of the shaft 21 are journaled in bearings 22, 23 extending from opposite sides of the cylindrical casing 6, respectively. A front end 24: of the shaft 21 extending beyond the bearing 23 is of reduced diameter, and it serves to provide a mount ing for a mutilated gear-wheel 25 and a pointer 26. The latter is movable over a scale 27 formed on an outer side of an in le plate 28. It will be noted that the scale 27 is so graduated that when the valve disk 19 is in its fully closed position, the pointer is in line with the zero marking of the scale, but when in its open position, as shown in Fig. 1, the pointer 26 is in line with the fullscale marking.

The index plate 28 is secured in the position illustrated by bolts 29 extending into a shoulder 31 projecting forwardly from the adjacent front side of the main casing 6. A resilient force may be exerted on the valve disk 19 tending to hold the same in the closed position shown in Fig. 7 by means of a spiral re-setting spring 32, one end 33 of which is rigidly secured in a recessed portion 34 of the gear-wheel 25. An opposite end 35 is secured in a member 36 adjustably positioned in an arcuate slot 3"? formed in the index late 28. A nut 38 mounted on a threaded outer end 39 of the member 36 serves to clamp rigidly said member 36 in a desired adjusted position.

The action of the spiral spring 32 in preventing overtravel of the valve disk 19 beyond its fully opened position may be supplemented by a spring 41 which is preferably of U-shape. One arm 42 of the spring is bent backwardly around an upper edge 4:3 of the shoulder 31, and it is secured to side at by screws 45. The other arm iscurved backwardly, as shown in Fig. 7, to provide an abutment 16 which is so positioned as to engage a toothed portion 47 of the gear-wheel 25 when the valve disk 19 approaches its full open position. The continued movement of the valve disk 19 with the portion 17 abutting against the spring 11 causes the latter to be bent backwardly, thereby exerting a retarding force which increases to a value sufficient to prevent a movement of the valve disk 19 beyond its fully opened position, as illus trated in Fig. 4. When the force thus operating to open the valve 1 is removed, as will presently appear in greater detail, the valve disk 19 is started moving in the reverse direction under the combined force of the resetting spring 32 and the stop spring 41.

The opening movement of the valve disk 19 just described may be effected by the operating mechanism 5 through a valve stem 4:8 and gear-wheel mechanism 19, of which the gear 25 is one element. Another element of the gear-wheel mechanism 49 is a gear-wheel 51 which may take the form of a segment. The gear-wheel segment 51 may be mounted on a stud 52 extending forwardly from the front side of the main casing 6. The segment 51 affords a pivotal mounting 53 to an upper end of thevalve stem 48.

An important feature of my invention is the provision of a valve structure, wherein air sulficient'to maintain proper combustion conditions, when, for example, the furnace losses only are to be supplied, may be assured merely by adjusting the closed or zero position of the valve disk 19. To this end, an adjustable abutment 54: is provided for the gear-wheel segment 51 comprisim an adjusting screw 55, one end of which is movable into and out of engagement with a shoulder 56 formed on the under side of the gearwheel segment 51. The adjusting screw 55 may be mounted in a split bearing 57 controlled by a clamping screw 58, the bearing 57 being mounted on an arm 59 extending downwardly from the supporting stud or post 52.

When it is desirable to adjust the zero or closed position of the valve disk 19 from that of Figs. 1 and 7 to'that of Fig. 3, the clamping screw 58 is released and the adj usting screw 55 turned in the direction to cause the valve disk 19 to move in a counterclockwise direction. Should the resulting flow be insui'iicient, further a justment may be had merely by turning the screw 55. It is particularly noted that this adjustment is eli'ected independently of the solenoid-operated mechanism 5. 7

Referring to Figs. 3 and 5, the operating mechanism 5 comprises a vertically posi tioned lift rod 61, a threaded upper end 62 of which adjustably engages a cylindrical nut 63 which is movable vertically in a hearing 6 1 afforded by a cylindrical bracket member 65. The bracket member 65 has laterally extending flanges 66 at its lower end which are bolted or otherwise secured to a supporting platform 67 constituting an integral extension from the upper side of' the main valve casing 6.

An upper end 68 of the lift rod nut 63 is provided with a horizontal flange 69 for engagement with an upper edge 71 of the bracket member 65 when the nut 63 and the lift rod 61 are in their lower position, whereby the same may be supported. The turning of the vertically movable nut 63 in its hearing may be prevented by a key 72, as shown in Fig. 5.

The upper end 68 of the nut 63 is connected by a pair of links 7 3 to a lever 74 having a pivotal mounting 7 5 on a solenoid frame 7 6. One end of the lever 74 is connected to a plunger 77 of the solenoid 4:, while the other end is provided with a counter-balancing weight 78. The position of the weight 78 on the lever 6 1 should be adjusted until the weight of the solenoid plunger 77 and connected operating mechanism 5 is just sufiicient to cause the flange 69 of the nut 63 to rest lightly on the supporting bracket 65.

Thus substantially the full force of the solenoid 4 may be applied directly to the valves 1 and 2 in the operation thereof.

The solenoid 4 may be mounted on an upper end of the frame 76, the lower end of said frame having a split bearing 79 positioned to engage the outer side of the supporting bracket 65 and it is provided with projecting spaced arms 81 interconnected by a clamping screw 82. A latch 83, which is mounted intermediate the arms 81 on the clamping screw 82, is so positioned as to be movable into engagement with the under side of the flange 69 when the operating mechanism 5 is in its raised working position. The load being thus removed from the solenoid 4, the latter may be de-energized and a saving in current effected. It will be noted, however, that since the operating mechanism 5 is locked, no assurance may be had as to the maintenance of predetermined conditions in the furnace or boiler. Therefore, the latch 83 should be used only where accurate operation is not absolutely necessary.

The length of the lift rod 61 or its position relative to the valve stem 48 may be adjusted by a hand-wheel 84 (Fig. 5) mounted on the lower end thereof. The handwheel 84 is provided with a supporting shoulder 85 for a sleeve 86 that extends vertically around the lift rod 61 and is movable bodily therewith. The sleeve 86 and the lift rod 61 may be guided during vertical movement incident to the operation of the solenoid 4 and the sleeve 86 also prevented from turning by means of a vertical bearing 87 which is mounted on a removable bracket arm 88 extending downwardly and forwardly from an under side of the main valve casing 6. A portion 89 of the sleeve 86 which is movable in the bearing 87 is preferably of rectangular cross-section and the bearing 87 is correspondingly formed. Access may be afforded to the interior of the bearing 87 by a removable cap member 91 constituting a front wall of said bearing.

An upper-end of the sleeve 86 (Fi 4) is provided with a supporting flange 92 for a cross arm 93. An outer end 94 of the cross arm 93 is provided with a threaded split bearing 95 for the reception of a vertically adjustable abutment 96 illustrated as a screw plug. The plug 96 may be operated by a knob 97, and it is provided with a-recess 98, as shown in Fig. 10, for the lower end of the pivoted valve stem 48.

When the adjustableabutment 96 is positioned as illustrated in Figs; 1, 7 and 10, the solenoid plunger 77 may operate throughout its full stroke without engaging the valve stem.48. However, when the abutment 96 is moved upwardly todecrease the space between the endof the valve stem 48 and the base of the recess 98, as shown in Fig. 3, the upward movement of the solenoid plunger 77 causes the abutment 96 to engage the valve stem48 imparting a corresponding upward movement thereto. This movement of the valve stem 48 causes the turning of the gearwheel segment 51 about its mounting 52, resulting in a counter-clockwise movementof the geanwheel 47, and, consequently, the valve disk 19. The opening movement of the valve disk 19 continues against the force of the spring 32 until it reaches its full open position shown in Fig. 4, overtravel beyond this position being prevented by the resilient abutment afforded by the spring 41.

When the solenoid 4 is de-energized, the plunger 77 and operating mechanism 5 drop by reason of their own weight against the force ofthe counterweight 78, the parts coming to rest when the flange 69 of the nut 68 engages the supporting bracket 65. With the dropping of the operating mechanism 5, the valve disk 19 returns to the original position defined by the adjustable abutment 54. It will be noted that the extent of operation of the valve disk 19 may be controlled not only by the adjustable abutment 96, but also independently by the lift rod 61, Moreover, the zero setting of the valve disk 19 may be adjusted by the abutment 54 independently of either the adjustable abutment 96 or the lift rod 61.

Referring to Fig. 3, a cross arm 99 is pro- Vided with a split bearing 101 supported on the flange 85 of the hand-wheel 84 and it may be clamped in this position into engagement with the sleeve 86 by means of a clamping screw 102. A setscrew 103 which extends into a slot 104 formed in an adjacent portion of the sleeve 86, serves to prevent a turning movement of the cross arm 99 about the lift rod 61. a

An outer end of the cross arm 99 terminates in a split bearing 105 for the reception of an adjustable abutment 106 illustrated as a screw plug corresponding to the abutment 96. The lower end of the abutment 106 is provided with an operating handle 107, while an upper end is designed to abut against a valve stem 108 of the fuel valve 2. In Fig. 1, the abutment 106 is shown in its lowered position, wherein it is spaced from the valve stem-108 regardless of the energizationor de-energization of the solenoid 4. The normal position of the abutment is illustrated in Fig. 3.

The fuel or oil valve 2, of which Fig. 11 is a vertical sectional view, comprises a casing 109 having inlet and outlet openings 110 and 111 respectively. Intermediate these openings is positioned a balanced valve 112 comprising an upper main section 113 and a lower section 114. The lower section 114 is mounted ma cylindrical section 115, a lower end 116 and a front side 117 of which are spaced from the adjacent wall of the casing 109 to provide a by-pass passage 118 extending from a main inlet passage 119 in communication with the inlet opening 110. The by-pass passage 118 may be continued by means of a wall portion 122, which extends from an opposite side of the cylindrical portion 114 to the adjacent wall of the casing 109, providing a closed end 123 for said by-pass passage 118. The portion 122 is preferably provided with a tapered opening 124 constituting a seat for a valve disk 125 of the by-pass valve 3. The valve disk 125 is provided with a spindle 126 which extends through a stuifing box 127 to a handwheel 128.

. The lower valve section 114 may have a plurality of rings 129, together with packing rings 130 which are clamped in position by additional rings 131. Fig. 12 illustrates another form of packing, wherein a cup-shaped elemen 132 is employed. A bottom stud 133 of the lower valve ection 114 is maintained by the pressure of the fluid in the bypass passage 118 in spaced relation to an upper head 134 of the operating stem 108. The head 134 is provided with a supporting shoulder 135, whereby the stem 108 may be supported in its lower position, as illustrated in ig. 11. The stem 108 extends from the valve casing 109 through a stuffing box 136. 9

An upper edge of the front side 117 of the cylindrical section 115 is extended vertically by means of a wall section 137 and then horizontally by means of a wall section 138, the latter terminating in the wall portion of the casing 109 adjacent to the outlet opening 111. The wall portions 137 and 138 together with the cylindrical section 115 and the wall portion 123 completely separate the outlet 111 from the inlet opening 110. 3 The section 138, however, is provided with a passage 139 through which extends the upper valve section 113. A seat 140 is formed in the passage 139 for a correspondingly beveled portion 141 of the valve section 113. A portion 142 of the valve section 113 below the beveled portion 141 is provided with a plurality of recesses 143, whereby fluid may pass between said portion 142 and the adjacent walls of the passage 139 when the valve section 113 is raised from its seat 140. During such movement, the section 113 is guided not only by the horizontal wall section 138, but also by an upper cylindrical section 144 positioned in alignment therewith but spaced from the valve seat 140 to provide a passage 145 in communication with the main inlet passage 119. A spring 146 abuts against the upper end of the main valve section 113 and the adjacent wall of the casing 109 and it serves to maintain the bevelled portion 141 in resilient engagement with its seat 140. V I

In order that a minimum obstruction may occur to the flow of fluid from the passage 139, the horizontal wall section 138 is spaced from the upper end of the cylindrical section 115. The lower valve section 114 is of reduced diameter immediately adjacent to the end of the main valve section 113 forming an abutment 147. The dimensions of the upper and lower valve sections 113 and 114 are preferably such that the force created by the fluid pressure on the upper section 113 is slightly greater than the force on the lower section 114. The unbalanced force on the upper section 113 is further increased by the spring 146. Such unbalancing facilitates the seating of the main valve section 113.

Assuming the apparatus in the normal operating position of Fig. 3, wherein the adjustable abutments 106 and 96 are in desired spaced relation to the valve stems 108 and 48, respectively, the energization of the solenoid 4 causes an upward movement of the lift rod 61 and the substantially simultaneous engagement of the abutments 106 and 96 with their respective valve stems. During the following upward movement of the plunger 77, the butterfly valve disk 19 is actuated into the open position of Fig. 4 against the force of the resetting spring 41 and, at the same time, the stem 16-8 actuates the lower valve section 114 into engagement with the upper valve section 113, causing the unseating of the latter and the interconnection of the inlet and outlet passage 119 and 112. This open position of the air and fuel valves 1 and 2 is maintained so long as the solenoid 4 is energized. User: the solenoid 4 is Clo-energized due to a change in the required volume of fuel and air, the operating mechanism 5 drops under its own weight, permitting the disengagement of the valve stems 48 and 108 and the return of the valve disk 19 and the valve sections 113, 114 to their original positions.

When it is necessary to compensate for, exam-ple, the losses of a furnace, the by-pass valve 3 is adjusted to permit a desired minimum how of fuel and the adjustable abutment 54 is actuated to move the valve disk 19 from its fully closed position so that a how of air may be maintained through the valve 1. It will be noted that these adjustments are effected independently of the abutments 106, 96 and the lift rod 61. The latter also permits the simultaneous adjustment of the abutments 106 and 96 should it be desirable to change equally the extent of operation of the valves 1 and 2.

1V hile I have shown only one preferred embodiment of my invention, for the purpose of describing the same and illustrating principles of construction and operation, it is apparent that various changes and modifications may be made therein, without departing from the spirit of my invention and I desire, therefore, that only such limitations shall be imposed thereon as are indicated in its the appended claims or as are demanded by duct, :1 fuel valve controlling the flow of fuel another ductindependent of the air duct,- said fuel valve having a manually adjustable by-pass valve therefor, electrically operated mechanism for substantially simultaneously opening said fuel valve and said air valve, and manually controlled means for adjusting the closed position of said air valve, whereby a desired minimum flow of air through said air valve may be insured.

2. In combination, a butterfly valve comprising a casing having a passage controlled by a valve disk, a fuel valve and a by-pass valve therefor supported on said casing, a solenoid also supported on said casing,- mechanism responsive to said solenoid for opening said fuel valve and said butterfly valve, and means for adjusting the closed position of said valve disk whereby a desired minimum flow through said butterfly valve may be established.

3. A valve structure comprising a solenoid, a valve having a depending control stem, operating means for said valve responsive to said solenoid including a lift rod independent of the valve and adjustable bodily relative to said stem, and an actuatingelement for said stem carried by said ro'd below and adapted to engage the depending end of the stem.

4. In combination, a solenoid, a valve having a depending stem, operating'means for said valve responsive to said solenoid including a rod independent of the valve and adjustable bodily relative to said stem, whereby the extent of operation of said valve may be adjusted, an actuating element for said stem carried by said rod below and adapted to engage the depending end of the stem, and means tending to counterbalance said operating means.

5; In a valve structure, a valve having a depending operating stem, electrical actuating means, and means responsive to said electrical means for actuating said stem comprising bodily adjustable rod independent of the valve and a bodily adjustable element carried by said rod and adapted to engage the depending end of the stem for actuating said stem upon the operation of said electrical means. 7 f

6; A valve structure comprising a valve having a dependingstem, a solenoid, means responsive to said solenoid for operating said stem comprising a rod independent of the valve and adjustable bodily relative to said stem and an independently adjustable ele ment carried by said rod in operative relation to said stem, and means for counterbalancing said first-mentioned means.

7. A valve structure comprising a valve having a stem, a solenoid having a movable plunger, a counterbalan'cing lever connected to said plunger, a rod connected tosaid lever and bodily adjustable relative to said stem, and means carried by said rod positioned in operative relation to said stem whereby said valve may be operated.

8. In combination, a valve having a stem, a solenoid having a plunger, a counterbalancing lever connected to said plunger, a lift rod so connected to said lever as to be ad justable bodily relative to said lever, and a cross arm having an adjustable abutment carried by said rod, said abutment being positioned in such relation to said stem that the actuation of said plunger causes the operation of said valve.

9. In combination, a valve, a solenoid hav: ing a plunger, and means responsive to said plunger for operating said valve including i a bodily movable nut, a lift rod extending into said nut and adjustable therein, and an adjustable abutment carried by said rod positioned in operative relation to said valve,

10. In combination, a valve, a solenoid having a plunger, a lever connected to' said plunger, a liftrod having a nut connected to said lever, and an independently adjustable abutment carried by said rod and positioned in operative relation to said valve, whereby the actuation of said plunger causes the operation of said valve,

11. In combination, a valve,- means opera; ble to actuate said valve in accordance with a predetermined condition comprising a bodily adjustable lift rod, a sleeve carried by said rod and adjustable therewith and an abutment disposed in operative relation to said valve, a latch for supporting saidlift rod in one of its positions, means for insuring a desired minimum flow through said valve when the same is in its closed position, a second valve, and operating means for said second valve carried by said rod.

12. In combination, a pair of valves, means for operating said valves comprising a lift rod, a sleeve carried by said rod, an adjustable abutment carried by said sleeve positioned in operative relation to one of said valves, and a second abutment supported by said rod positioned in operative relation to the other valve, whereby said valves may be opened and closed.

13. In combination, a pair of valves, means operating said valves comprising a lift rod, a sleeve carried by said rod, an adjustable abutment carried by said sleeve positioned in operative relation to one of said valves, a second abutment supported by said rod positioned in operative relation to the other valve, and means for adjusting the 14. A valve structure comprising a pair of valves, means operable to actuate said valves comprising a main actuating rod, a sleeve carried by said rod having an adj ustable abutment mounted thereon, a second abutment secured to said sleeve, said abutments being positioned in operative relation to said valves, respectively, and independently adjustable means for insuring a desired minimum flow through one of said valves.

15. A valve structure comprising a pair of valves, means operable to actuate said valves comprising a main actuating rod, a sleeve carried by said rod having an abutment mounted thereon, a second abutment secured to said sleeve, said abutments being positioned in operative relation to said valves, respectively, means for adjusting the closed position of one of said valves so as to insure a desired minimum flow therethrough and a manually adjustable by-pass valve for the other of said pair of valves.

16. A valve structure comprising a pair of valves, a solenoid, means responsive to said solenoid for operating said valves coinprising a bodily adjustable lift rod, independently adjustable abutments individual to each valve carried by said lift rod, one of said valves having a bypass valve, and manually adjustable means for said last-mentioned valve.

17. In combination, a pair of valves, a solenoid, means responsive to said solenoid for operating said valves comprising a bodily adjustable lift rod, independently adjustable abutments individual to each valve carried by said lift rod, one of said valves having a bypass valve, manually adjustable means for said last-mentioned valve, and means for adjusting the closed position of the other of said valves, whereby a desired minimum flow therethrough may be maintamed.

18. A valve structure comprising a pair of valves having operating stems, means operative on said stems to control the flow of fluid through said valves, said means including a solenoid, a lift rod adjustable bodily relative to said valves, a sleeve carried by said rod having one portion of substantially rectangular cross-section, a bearing for said portion, abutments secured to said sleeve in operative relation to said valve stems respectively, and a by-pass valve for one of said valves.

19. Valve apparatus comprising a pair of valves having operating stems, means ope-rative on said stems to control the flow of fluid through said valves, said means includ ing a solenoid, a lift rod adjustable bodily relative to said valves, a sleeve carried by said rod having one portion of substantially rectangular cross-section, a bearing for said portion, abutments secured to said sleeve in operative relation to said valve stems respectively, a by-pass valve for one of said valves, and independently adjust-able means for insuring a desired minimum flow through the other of said valves.

20. In combination, a pair of valves having separate stems, operating means for said valves including a nut, a manually ad ustable rod extending 1nto said nut, a latch for engaging said nut when said rod is to be 21. In combination, a valve having avalve disk, a driven gear-wheel for operating said valve disk, a driving gear-wheel in mesh therewith, and means operative on said lastmentioned gear-wheel to adjust the closed position of said valve disk, whereby a desired flow through said valve may be maintained.

22. A valve having a valve disk, a driven gear-Wheel connected to said valve disk, a co-operating drivinggear-wheel, means operative on said la st-mentioned gear-wheel to adjust the closed position of said valve disk, and independent means operatively associated with said driving gear-Wheel, whereby said valve disk may be moved to a desired extent.

23. A valve having a valve disk, a dial plate provided with a pointer connected to said valve disk, and adjustable resilient means tending to retard the movement of said valve disk in one direction, said dial plate having an arcuate slot, said means including an adjustable abutment movable 1n said slot from one desired position to another.

24:- A valve having a valve disk, a dial plate provided with a pointer connected to said valve disk, adjustable resilient means tending to retard the movement of said valve disk in one direction, said dial plate having a slot, said means including an adjustable abutment movable in said slot from one desired position to another, and means whereby the zero position of said valve disk may be adjusted to insure a desired minimum flow through said valve.

25. In combination, a valve, a pointer connected to said valve, a gear-wheel for causing the actuation of said pointer and valve, a dial plate disposed in operative relation to said pointer, whereby the extent of operation of said valve may be indicated, resilient wheel and a pointer connected to said valve disk, a dial plate for said pointer, resilient means for retarding the movement of said valve disk in one direction, and auxiliary means for supplementing the action of said resilient means, said first-mentioned means being adjustably secured to said dial plate.

27. A valve having a valve disk, a gearwheel connected to said valve disk, a spring tending to prevent a movement of saidvalve disk into its open position, means supple mentary to said first-mentioned means positioned to abut against the teeth of said gearwheel when said valve disk tends to move beyond its open position.

28. A valve having a valve disk, a gearwheel connected to said valve disk, a gearwheel segment having a pivoted depending stem, and an adjustable abutment for said gear-wheel segment operative to vary the closed position of said valve disk, whereby a desired minimum flow through said valve may be assured.

29. In combination, a pair of valves having actuating stems respectively, therefor, means operable to actuate said stems, one of said valves having a valve disk, and gearwheel mechanism for operatively connecting said valve disk and the actuating valve stem associated therewith.

30. In combination, a pair of valves having stems, means operable to actuate said stems, one of said valves having a valve disk, gear-wheel mechanism for operatively con,- necting said valve disk and the valve stem associated therewith, and means operative on said gear-wheel mechanism to adjust the closed position of said valve disk.

31. A valve structure having an air duct and a valve controlling the flow of air therethrough, a fuel duct independent of the air duct and an independent valve controlling the passage of fuel through the a by-pass for fuel around the fuel valve when in its duct-closing position, and means for adjusting the closed position of the air valve whereby a desired minimum flow of air through the air valve may be insured.

32. A valve structure having an air duct and a valve controlling the flow of air therethrough, a fuel duct independent of the air duct and an independent valve controlling the passage of fuel through the fuel duct, a by-pass for fuel around the fuel valve when in its duct-closing position, means for adjusting the closed position of the air valve whereby a desired minimum flow of air through the air valve may be insured, and means for regulating the amount of fuel passing through the said by-pass.

GEORGE F. BEACH.

fuel duct,

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