US2051938A - Valve assembly - Google Patents

Description

Aug 25, 1936. o. F. CARLSQN 2,051,938

VALVE ASSEMBLY Filed June 29, 1955 2 Sheets-Sheet 1 Aug; 25, 1936. o. F. CARLSON VALVE AS S EMBLY Filed June 29, 1935 2 Sheets-Sheet 2 Patented Aug. 25, 1936 vALvr: ASSEMBLY Oscar F. Carlson, Chicago. Ill., assigner to Oscar F. Carlson Company, Chicago, Ill., a corporation of Illinois Application June 29,

18 Claims.

This invention relates'to valve assemblies, and is directed more particularly to a valve assembly for a feed water control to a boiler or the like, whereby the amount of water fed to the boiler may be automatically controlled in accordance with the position of a remotely disposed iloat mechanism, or may be manually controlled, if desired. It is obvious, however, that the particular valve mechanism shown herein is not limited only to this specic use.

In the preferred embodiment of my invention, I provide a valve assembly in which the valve member is mounted for longitudinal reciprocatory movement in response to actuation of a suitable solenoid mechanism, the construction being such that the valve member is positively held upon its seat independently of gravity or water pressure when the solenoid is in inoperative position.

Another feature of the present invention resides in the provision of a dash pot arrangement for Vthe valve member, whereby it cannot be snapped into full open position or into closed position. This is of distinct advantage in eliminating water hammer due to suddden closing of the valve, thereby preventing pounding in the water lines, which is decidedly objectionable.

The present construction also provides an arrangement wherein the valve member is maintained in substantially balanced position with respect to water pressure whenever the valve is opened. whereby variations in water pressure will not aiect the operation of the valve under the influence of the controlling mechanism.

It is also within the contemplation of the present invention to provide a valve assembly responsive to actuation of a remotely disposed water level control device or the like, whereby the valve is automatically opened upon closing of the circuit in the control device due to lowering of the water level in a boiler or the like, and is automatically closed upon raising of this water level to a predetermined maximum. Provision is also made for manual operation of the valve through the same operating mechanism, when and if desired, thereby eliminating the usual by-passes and auxiliary piping formerly required.

Another distinct feature of the present invention resides in the provision of a lost motion connection between the electrically controlled magnetically responsive actuating member and the valve operating means, whereby the inertia of movement of this member is employed to force the valve open from what may be termed an unbalanced position whereby the pressure in the valve chamber tends to maintain it closed, and to 1935, Serial N0. 29,001

force the valve into this position upon deenergization of the actuating circuit.

Still another feature present in my construction is the separation of the valve stem and the actuating means, the two parts being connected by a link arrangement and so arranged that a straight line opening and closing force -is imparted to the valve stem axially thereof, whereby no binding of the stern in its guides is produced.

Another advantage secured by the present invention is the provision of an operating chamber for the valve actuating mechanism in which practically no interchange of water takes place, so that the water in this chamber remains substantially the same at all times. This reduces to a minimum the depositing of foreign materials carried by the water in this chamber, whereby the opening of the valve assembly for cleaning this chamber is eliminated, and further, there is no interference with free reciprocation of the valve stem by the depositing of gritty particles or the like upon the valve bearing portion.

In addition, I provide a ilexible metallic seal for carrying the valve operating mechanism outwardly of the valve housing to the manual and electrical control mechanism, thereby sealing the chamber against leakage of water, and at the same time providing for free operation of the actuating mechanism through the sealed opening.

Other objects and advantages of the present invention will appear more fully from the following detailed description. which. taken in conjunction with the accompanying drawings, will disclose to those skilled in the art the construction and operation of a preferred form of the present invention.

In the drawings:

Figure 1 is a vertical sectional view through the valve assembly and operating mechanism;

Figure 2 is an end sectional view of the oper- 40 ating mechanism shown in Figure 1, taken substantially on the line 2 2 of Figure 1; and

Figure 3 is a top plan view of the mechanism 'shown in Figure l.

Referring now in detail to the drawings. I provide a valve housing or casing 5, having an inlet opening 6 and an outlet opening 1. The casing is also provided with an intermediate wall 8. which provides an auxiliary chamber 9 carrying the valve actuating mechanism.

'Ihe inlet chamber is connected through opening 6 to a suitable supply source for feed water or make-up water, the flow of the water being controlled by the valve stem l0 cooperating with the valve seat I2 formed by the hollow bushing 55 2 member I3carried in a partition wall I4 formed in the casing 5 between the inlet 6 and outlet 1.

The water entering the inlet 6 passes through a suitable cylindrical screen or iilter I5 disposed anterior to the valve opening I1 formed in the bushing I3, and ls supported in position by means of a plate member I6 secured against the lower portion of the valve casing about the opening I9 therein, there 'being a suitable gasket 26 interposed therebetween. Suitable'- bolts 22 provide for clamping of the plate I8 to the valve casing 5, and a suitable drain-out or clean-out plug 23 threads into the plate I8 for the purpose of accommodating cleaning out of the interior of the lter I5 whenever it becomes filled with foreign material deposited therein by the flow A of water therethrough. The lower end of the lter I5 is supported in an annular cup-shaped supporting ring 24 mounted upon a suitable recessed shoulder formed in the inner face of the closure plate I8. v

In order to provide access to the valve seat I2, a closure plug 25 is threaded into the lower wall of the casing 5 directly below the bushing I3, whereby the bushing I3 may be secured in position' through this opening, and the plug 25 then screwed into position to close the same.

Mounted upon the valve casing 5 and closing the auxiliary chamber 9 is a second housing member 26, which is secured by means of suitable bolts 21 to the top of the valve casing 5, there being a suitable gasket 28 clamped between the two housings.

The housing 26 is provided with a boss'portion 29 which is suitably bored at its lower inwardly extending end to receive the upper end of the valve stem member I0, there being a suitable closure plug 39 mounted in the upper endv of this opening and forming a dash-pot chamber 32 for cushioning the opening and closing movement of the valve stem I0.

The stem I0 is guided for movement in the opening 32, and in a suitable opening formed in the intermediate partition wall 8. The lower end of the valve stem I0 is frusta-conical in shape, as indicated at 33, and is adapted to have bearing on the valve seat I2 for closing ol the now of water from the inlet 6 tothe outlet 1. With the particular type of valve disclosed, I iind that an opening of approximately 11g of an inch is suiicient to provide for the desired flow of water through the valve assembly.

Intermediate its ends, the valve stem I6 is provided withl an opening receiving the pin member 35, to which is secured a U-shaped actuating link 36, the lower end of thc link 36 being secured by the pivot 31 passing through the enlarged opening 38` in the valve stem I8 and secured to the ends of a pair of arm members 38 riveted together at 39 and 40. The two link members are spread outwardly adjacent the valve stem, to pass on. opposite sides thereof, and are secured tothe link 36 whereby the linkpivots'about the ends of the arm 38', and a straight line thrust against the pin 35 is thereby produced for opening and closing the valve member.

An operating arm member 42 is flxedly secured to the arm 38 by means of the pin. or rivet 40, and is pivoted at 43r to a pair of ears 44 carried by the upper casing or housing section 26. The pivot 43 forms the pivotalrsupport for the arm comprising the arms 38 and crank arm 42. The connection between the arms 38 and the casing 2 is in the form of a bellows seal 45 which is secured at its lower end to a plate 46 carried on the struction, the plate 46 is first secured against the lower end of the bellows 45, and the arms 38 are then pressed upwardly thereagainst, the pinY 40 then being passed through the lower end of the arm 42 and the arms 38 to secure the same in tight abutting engagement with the plate 46. The plate 46 is provided with a rectangular opening of sucient size to accommodate the lower reduced portion 50 of the arm 42, which is then sealed by soldering.

The arm 42 comprises a pair of plate members 52 and 53, which are riveted together at a plurality of points such as indicated at 54, to hold the same in tight rigid engagement, and are spread apart between the ears 44 to provide suitable bearings for the arm about the pivot 43.

At their upper ends, the plates 52 and 53 forming the-arm 42 include a cam portion or slot 55, in which a roller 56 is disposed. The roller 56 is carried on a pin 51 disposed between a pair of downwardly extending arms 58 formed at the inner end of a hand operated lever member 59. This lever 59 is pivoted at 60 about a pair of outwardly extending ears 62 carried by the solenoid supporting housing 63.

The arms 58 of the lever member 59 are also engaged by a suitable pin 64 carried by the lower bifurcated ends 65 of a loose sleeve 66 carrying a plunger member 61 therein, the plunger member 61 being restrained against movement laterally of the sleeve 66 by means of inwardly extending iianges 68. The plunger member 61 is provided at its upper and lower ends with cushioning members 69, which may be formed of cork, rubber or the like, and which are adapted to abut against the upper end 19 of the member 66 and against a cross piece 12 carried at the lower end of the flanges 68 above the bifurcated arms 65.

The solenoid housing 63 is supported upon the upper casing member 26 by means of a plurality of bolts 13 as mpre clearly shown in Figure 3. The upper end ofthe housing 63 is formed to receive the solenoid coil 14, which is mounted upon a suitable supporting member 15 disposed within the open upper end of the housing 63, the coil being connected to a pair of binding posts 16 and 1 1 by means of the conductors 18. These binding posts are carried in a lateral extension 19 of the housing 63, being supported upon suitable supporting bushings which therebetween support an insulating block 82.

Between the terminals 16 and 11 I provide an insulating barrier web 83 formed integral with block 82. A supporting insulating strip 84 covers the counter-sunk heads of the terminals 16 and 11. From the terminals 16 and 11, conductors may be led out of the opening 85 in the extension 19 of the housing 63 for connection to any suitable actuating circuit, such as a remotely disposed iioat responsive mechanism or the like. Closure of this circuit results in energization of the solenoid coii 14 through the terminals 16 and 11. A suitable closure plate 86 is mounted upon the upper anged end 81 of the housing 63 by means of a plurality of screw members 88, also extending over and closing the upper end of the extension 19 of the housing.

In the operation of the device disclosed, with the valve set in the position shown in Figure 1, it is closed upon ,its seat due to the fact that the pivot 43 is disposed slightly oil? center with respect to the center line of the bellows 45, being placed slightly to the left of the line between the pin 51 and the pin 40. This provides for a greater pressure being exerted upon the right side of the bellows than is exerted upon the left side of the bellows, it being remembered that the pressure of the water at the inlet 6 causes the auxiliary chamber 9 to be illled with water which is at substantially inlet' pressure. .Thus the valve 'IIJ is maintained closed, more or less independently of gravity acting on the valve itself or the pressure within the inlet acting on the lower end of the valve. This offset of the pin 43 results in stressing of Ythe bellows in what might be termed a counter-clockwise direction, so that the bellows tend to rotate the arms 38 in a downward direction, tending to force the valve member I upon its seat. However, whenever the arms 38 are swung in a clockwise direction, the plate 46 is shifted slightly to the left so that the pressure within the auxiliary or intermediate chamber 9 is now substantially equal on both sides of the pivot 43. Thus, whenever the valve is opened, the pressure within the chamber 9 is substantially balanced so far as any further tendency to open or close the valve l0 is concerned. During normal operation of the valve, therefore, to and from its seat, there is no pressure tending to urge it in either direction.

Upon actuation of the solenoid coil 64, the plunger member 61, which is disposed within the guide sleeve 66 extending up into the core 9U of the coil, is drawn upwardly, and its inertia of movement upon striking the upper end of the sleeve 66 produces an upward impact on the sleeve. This striking-of the plunger against the upper end of the sleeve 66 results in moving the sleeve upwardly, which, through its bifurcated end 65 connected to the pin 64, results in drawing of the roller 56 upwardly against the camming surface of the slot 55. This rotates the arm 42 in a clockwise direction about the pivot 43, thereby shifting the lower end of the bellows sealing member and the pin 40 slightly to the left, whereby the links 38 are urged upwardly. 'I'his movement of the arms 38 upwardly at their left hand end results in the production of an upward thrust at the pin 35 through the link 36, moving the valve stem upwardly oi of its seat. Due to the fact that there is some clearance between the upper end of the valve stern I0 and the walls of the cylin- -drical opening 32, there is water disposed in this opening, and consequently it is necessary that this water be displaced before the valve member I0 moves into its full open position. This provides a dash-pot arrangement, therefore, preventing opening of the valve member Ill'with any great degree of snap action, and its opening movement is thereby cushioned by the water within the cylindrical chamber 32.

As long as the solenoid coil 14 remains energized, the plunger member 61 and the sleeve 66 will be maintained in upper raised position, holding the arm 42 in its pivoted position, and thereby holding the valve stem I0 in its upper or raised position. Upon deenergization of the coil 14, the plunger 61 drops downwardly, hitting the bar 12, and thereby moving the sleeve member 66 and the roller 56 downwardly so that the roller moves inwardly of the slot 55, allowing the arm 42 to rotate slightly in a counter-clockwise direction,

whereby the pressure of the water within the auxiliary chamber 3 restores the bellows to its normal position, and slightly cocks the same due to the .fact that the pivot 43 is disposed slightly oil' center with respect to the center line of the bellows, forcing the varms 38 downwardly by moving the pin 40 slightly to the left, and thereby moving the valve stem I0 downwardly onto its valve seat I 2. However, due to the fact that there has been a displacement of water in the chamber 32, downward movement of the valve stem l0 outwardly of this chamber will result in producing a vacuum within the chamber, which retards the closing movement of the valve stem, and thereby prevents rapid closing of the valve. This eliminates water hammer in the lines connected to the valve, and thus eliminates the objectionable pounding heretofore occasioned by electrically operated valves.

It may be desirable, at times, to operate the valve to allow water to flow independently of the automatic operation provided by the solenoid 15. For this purpose, the outer end of the manually operable lever 59 is pressed downwardly, moving the roller 56 upwardly in the slot 55, and thereby moving the roller in an arc about the pivot 60. This cams the arm 42 slightly to the right at its upper end, moving the lower end of the arm and the pin 40 to the left. This results in imparting the raising movement of the arms 38 to the valve stem I0 through the link 36 and pin 35, and pro-- vides for raising of the valve by manual operation independently oi the solenoid 14. This operation of the valve in no way disturbs the solenoid actuating mechanism, and thereby provides for operation of the valve manually at the valve with the consequent elimination of auxiliary piping and valve means, which was heretofore necessary. Upon return of the manually operable lever 59 to the position shown in Figure l, the ilexible bellows returns the arm 42 to its normal position and since the pivot 43 is disposed slightly to the left with respect to the center line of the bellows, overstresses the bellows to an extent such that it tends to cock in a direction such that the plate 46 moves the pin 40 slightly to the right, and the pressure within the chamber 9 maintains the bellows in a partially unbalanced condition, with the arms 38 being urged in a counter-clockwise direction. 'I'his holds the valve member I0 firmly upon its seat.

It is therefore believed apparent that I have provided a valve assembly for use either with a manually or automatically operable control mechanism, whereby the valve actuating mechanism will produce opening and closing movement of the valve without any water hammer or the like, and further, will tend to maintain the valve closed independently of gravity or water pressure by reason of the displacement of the pivot with respect to the ilexible sealing means. In addition, due to the fact that there is practically no movement of water into and out of the chamber 9 after the chamber has once been filled, there is no chance for any accumulation or depositing of foreign materials, grit, dirt or the like within this chamber, which would interfere with the operation of the valve actuating mechanism or the reciprocatory movement of the valve stem. Another advantage is produced by the limited amount of movement of the plunger 61 which can be provided before the plunger operates the sleeve member 66, whereby the impact of its movement upon the upper or lower stops 10 and 12 of the sleeve results in the proper camming operation by the roller S in the slot 55 of 'the arm 42 to pass the lower end of the arm, and the pivot 40 past the center line position so that the valve may be opened. Thus the valve is normally maintained in a biased position tending to hold the same closed, but by the impact movement of the solenoid actuating member it can be forced over this position and then resume its normal movement.

Various other features are apparent' from the detailed description, such as the facility in assembling and disassembling the valve for inspection, repair or replacement of parts, the provision of a ilexible sealing member for carrying the valve actuating mechanism out of the valve housing, the ease of removing the lter means and the valve seat member for adjustment, cleaning, or repair, and the incorporation of the manually operable member directly within the valve construction, so that no auxiliary piping or additional valve members need be required.

Having therefore described my invention in accordance with the patent statutes, what I claim as new and desire to secure by Letters Patent is:

1. In a valve assembly having a reciprocable valve member, actuating means for said member including an arm having means for connecting it at one end to said valve member, a second arm l pivotaliy mounted intermediate its ends and hav- `lng rigid connection at oneend to the opposite end of said ilrst arm, a cam slot in the opposite end of said second arm, cam means engaging in said slot, and a resilient tubular bellows enclosing said second arm between said rigid' connection and said slot and sealed to a xed support, the pivotal mounting of said second arm being disposed laterally of the center line of said bellows whereby pressure exerted through the bellows tends to cock said second arm in one direction about its pivot.

2. A valve assembly including a valve housing having inlet and outlet openings, valve means for controlling liquid flow between said openings including a reciprocable valve stem guided for movement in said housing, a closure member secured to said housing and having an opening spaced laterally of said valve stem, pivot ears carried by said member and extending into said housing below said last mentioned opening, an arm pivoted intermediate its ends between said ears and extending outwardly through said last mentioned opening, means pivotaliy connected between the inner end of said arm and said stem, and resilient bellows enclosing the ears and sealed to the closure member about said last mentioned opening, said bellows being responsive to pressure in said housing for normally biasing said valve stem toward valve closed position.

3. In a valve housing having a valve membe actuating means for said member including an arm pivoted intermediate its ends, means engaging one end of said arm for rotating said arm in one direction about its pivot, a resilient bellows enclosing a portion of said arm and having one end fixed in position, the opposite end of said bellows being rigidly secured-to said arm, means rigidly secured to said arm adjacent said opposite end of said bellows, the pivot of said arm being disposed laterally of the center line of said bellows whereby pressure exerted through said bellows tends to rotate said arm in a direction opposite to that produced by the rotating means, and means pivotally securing said rigidly secured means to said valve member.

4. In combination, a valve housing, a valve seat therein, a. valve stem guided for reciprocal movement toward and away from said seat, actuating means pivotaliy connected to said stem within said housing and having a portion thereof extending parallel to said stem and outwardly of said housing, resilient bellows means enclosing a portion of said extending portion and sealing the interior of said housing against leakage past said portion, said extending portion being pivotaliy mounted within said bellows, and external means for rotating said extending portion about said pivotal mounting.

5. The combination, in a valve assembly having a reciprocatory valve, a pivotaliy mounted bell crank lever connected at one en d to said valve and having cam means at the opposite end thereof, pressure responsive resilient means engaging said lever and normally biasing it toward valve closed position, and a cam member engageable with said cam means and movable in a limited arc for actuating said member, of actuating means for said cam member including a sleeve member connected thereto and having an armature having limited sliding movement therein between spaced restraining means on said sleeve member, and electromagnetic means for actuating said armature into impact against said restraining means to snap said cam member against said cam means for throwing said lever toward valve open position.

6. In combination, a valve housing, a valve therein, actuating means for said valve including a pivoted bell crankl having pivotal connection at the end of one arm portion with said valve and having a cam slot in the end of the other arm portion externally of said housing, a manually operable lever plvotally supported externally of said housing and having means engageable in said slot for rotating said bell crank, and means sealing the extending cam portion of said arm and operable through pressure in said housing for normally biasing said arm toward valve closed position.

7. A valve assembly including a reciprocatory valve member, a link engaging said member intermediate its ends land pivotaliy connected thereto, said link having a web portion engageable with said stem to limit pivotal movement of said links, an actuating lever having a bifurcated end receiving said stem, a pivot between the end of said lever and said link extending through an enlarged opening in said member below the pivotal connection between said member and said link, and means for rocking said lever through a limited arc to reciprocate said valve member.

8. A valve assembly comprising a. valve housing, a reciprocatory valve member therein, means pivotaliy mounted in said housing for actuating said valve member and including an arm extending outwardly of said housing, means supported externally of said housing and having camming engagement with said arm, electromagnetic means supported on said housing, means controlled thereby for actuating said camming means including an armature having means for imparting a blow to said actuating means, and exible sealing means for the extending portion of said arm and through pressure normally biasing said valve actuating means toward valve closed position, said armature blow removing said bias during valve opening movement.

9. A valvel assembly including a valve housing, valve means for controlling liquid flow through said housing, and actuating means for said valve means extending into said housing at a point spaced laterally of said valve means and having pivotal connection therewith, said actuating means having a fixed pivot Within said housing, and resilient means sealing the actuating means from the interior of said housing and normally through pressure biasing said valve means against opening movement, the bias of said sealing means being removed upon predetermined movement of said valve means.

10. In combination, a valve housing having a valve seat therein, a valve member reciprocable in said housing for engaging said seat, a link pivoted on said member intermediate the ends thereof, a rocking arm pivotally mounted in said housing and having an outwardly extending end, a lever rigidly secured to the inner end of said arm and pivotally engaging said link whereby rockingA of said arm about its pivot in opposite directions reciprocates said valve member, a cam slot formed in the outer end of said arm, means engageable in said slot for rocking said arm, and iiexible resilient bellows sealed to said housing about the opening through which said arm extends and enclosing the pivotal support of said arm, said bellows normally through pressure biasing said arm in a direction to hold said valve member in closed position.

11. In combination, a valve housing, a valve seat therein, a reciprocatory valve member for said seat, an intermediate chamber in said housing, actuating means in said chamber spaced laterally of said valve and including an arm pivotally connected to said member to impart longitudinal reciprocatory movement thereto, sealing means comprising a iiexible bellows for sealing the outlet from said chamber through which said arm extends, and means supporting said arm and oset with respect to said bellows means so that the pressure in said chamber cocks said arm in a direction tending to hold said valve member on said seat.

12. In combination, a valve housing having inlet and outlet chambers, an intermediate chamber therebetween communicating only with said inlet chamber, a closure for said intermediate chamber having a pair of inwardly extending ears forming a pivotal support within said intermediate chamber, an arm pivoted intermediate its ends on said support and having an outwardly extending end, a cam surface formed in said end, a valve member guided for reciprocatory movement in said housing, means pivotally connected to said member and secured to the opposite end of said arm, a manually operable lever pivoted to said closure externally of said housing and having camming means engaging said cam surface for rocking said arm about said pivotal support to reciprocate said valve member through said pivotally connected means, and flexible sealing means sealing said arm and pivot ears from said intermediate chamber and offset with respect to said arm whereby the pressure on said sealing means normally -cocks said arm toward valve` closed position.

13. In combination, a valve housing having an inlet chamber, an'outlet chamber, a valve seat therebetween, a valve engageable with said seat, an intermediate chamber having an opening forming a guide for said valve and communicating with said inlet chamber, said intermediate chamber having a closure member provided with a pair of laterally spaced openings, one of said openings being closed to provide a dash pot and guide for the upper end of said valve, actuating means for said valve pivotally mounted on said closure member within said intermediate chamber, and iexible sealing means about the other opening in said closure member and enclosing the pivotal mounting of said actuating means, said sealing means being oilset with respect to said pivotal mounting whereby pressure thereon normally biases said actuating means toward valve closed position.

14. In combination, a valve housing, a reciprocatory valve member therein, an intermediate chamber having means for guiding reciprocation of said member, a closed chamber at one end of said member for preventing snap opening or closing of said member, actuating means for said member pivoted in said intermediate chamber and extending outwardly of said housing, and flexible sealing means enclosing Vthe pivotal mounting of said actuating means and normally biased to position to hold said Valve member in valve closed position, said bias being removed upon initial operation of said actuating means in valve-opening direction.

15. In combination, a valve housing, a reciprocatory valve member therein, actuating means pivoted laterally of said member in said housing and pivotally connected with said member, said actuating means having an amr extending outwardly of said housing parallel to said member, a flexible bellows rigidly secured to said actuating means and enclosing the pivot thereof for sealing the extending portion of said arm from said housing, said bellows being eccentrically disposed with respect to said arm whereby pressure on said bellows nonnally biases said arm toward valve closed position, and means disposed externally of said housing and including a cam engaging the end of said arm for rotating said arm to move said valve member toward open position, said means simultaneously moving said bellows over center with respect to said arm pivot to remove said bias after predetermined movement of said valve member.

16. In combination, a valvehousing, a reciprocatory valve member therein, actuating means pivoted laterally of said nrember in said housing and pivotally connected therewith, said actuating means having an arm extending outwardly of said housing, a flexible bellows rigidly secured to said actuating means and enclosing the pivot thereof for sealing the extending portion of said arm from said housing, said bellows being eccentrically disposed with respect to Said arm whereby pressure on said bellows normally biases said arm toward valve closed position, and means pivoted externally of said housing and engaging the outer end of said arm for rotating said arm against said bias to open said valve, said means simultaneously moving said bellows over center with respect to said arm: pivot to remove said bias after predetermined movement of said arm.

17. In combination, a valve housing, a reciprocatory valve member therein, actuating means pivoted laterally of said member in said housing and pivotally connected therewith, said actuating means having an arm extending outwardly of said housing, a iiexible bellows rigidly secured to said actuating means and enclosing the pivot thereof for sealing the extending portion of said arm from said housing, said bellows being eccentrically disposed with respect to said arm whereby pressure on said bellows normally biases said arm toward valve closed position, and means disposed externally of said housing engaging the outer end of said arm for rotating said arm, said means including a 'sleevelmemherI an amature having limited free movement therein, and electromagnetic means for actuating said armature, said armature upon actuation imparting a blow to said sleeve member which moves said bellows out of said normal biasing position.

18. In combination, a valve housing, a valve seat, a valve member shiftable in said housing toward and away from said seat, a pivot offset laterally of said valve member in said housing, actuating means on said pivot having a normally extending portion pivotally connected to said member and having resilient means sealing said pivot and a portion oi said actuating means from the interior of said housing, said resilient means being responsive to pressure in said housing for normally biasing said actuating means toward valve closed position, and impact means operatively connected to the actuating means externally of said housing and adapted upon energization to remove said bias and to cause said actuating means to move toward valve open position, said impact means upon deenergization restoring said bias as said actuating means moves into valve closed position.

OSCAR F. CARLSON.

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