Патент USA US2412428код для вставки
Dec. 10," 1946. E. A. ROCKWELL EI'AL 2,412,428 - UNLOADING DOUBLE CHECK VALVE Filed Dec. 24, 194: 37 Edward’ (2. Rockwell v I R Jig” Roz/L.‘ JJZM Z%517§i A “ PatentedDec. 10; 1946 _ 2,412,428 ' *UNlTED STATES PATENT oFFlcs UNLOADING DOUBLE CHECK VALVE 7 Edward A. Rockwell, Cleveland, and Jay M. Roth; Euclid, Ohio, assignors to Pesco Products 00., ' a‘ corporation of Ohio _ Application December 24, 1943, Serial No. 515,604 3 Claims. . ‘ 1 (Cl. 13’l—153) I The present invention relates to pressure regu lating valve arrangements and particularly to ~ 2 the inlet stub. Inlet stub t is threaded to receive a coupling’ 9 for the feed pipe to leading from arrangements of this type e?ective'to receive a the pump (not shown), and the relief or unload- ' ‘pressure fluid from a constantly operating gen ing stub 8 is threaded to receive the fluid return erator and deliver the same to and maintain a Ch pipe II that leads from the housing back to the selected range of pressures in an accumulating pump. The outlet stub l' is threaded‘ to receive system, unloading or relieving the generator to a ?anged coupling l2 having a threaded central the low pressure return when a selected maximum opening for connection with the pipe l3 leading Pressure is obtained. ' from the housing to an accumulator or like struc It is an object of this invention to simplify the ture_(not shown). ' ~ ‘ construction of an unloading valve assembly such The inlet stub 5 is provided with a port II to , as contemplated herein, and to improve the ef discharge the ?uid into a neck portion I5 of the ?ciency and operation thereof; <\ housing that is between the outlet stub l and A more particular object is the provision of a return or unloading stub 8. This flow is con improved control valve assembly including a pres trolled by a one-way outward ‘pressure check sure delivery valve anda relief return valve, the valve l8 that functions to prevent reverse ?ow of 1 two valves being connected together against rela tive movement and being eil’ective to alternately valve It is cup-shape in axial section and it has ’ engage respective corresponding valve seats and a chamiered portion I‘! that is engageable with a the ?uid backward into the inlet stub. Said check having adjustable resilient means for urging the 20 valve seat it at the inner edge of coupling 9, and relief return valve in the direction of seating _ it also has passages l9 through its cylindrical wall which permit the ?uid to flow to the dis mum value in the closed position of said valve charge port M when this check valve is unseated. _ decreasing as said valve is moved in the direction A coil compression spring 2c is interposed between of open position to thus insure complete opening 25 check valve it and the wall of the housing that movement of said relief return valve and com— bounds the outlet port 14, and this spring urges plete closing movement of said pressure delivery the check valve in a direction toward tts seat I8. valve once such movement has been initiated. The pressure of the ?uid- from the pump will ’ Additional objects, aims and advantages of the push the valve away from its seat to effect the‘v present invention will be apparent to persons 30 passage of the ?uid into the housing and any - skilled in the art after the Iconstruction and oper tendency of the fluid toreverse its normalv direc position thereof with a force which has a maxi- ~ ation of this double check unloader valve is un derstood from the within description. It is preferred to accomplish the numerous objects of this invention and to practice the same in substantially the manner hereinafter fully de tion of flow will result in the closure of the valve. The neck portion iii of the housing ‘provides a guide for the spindle of a double check valve assembly and at ends of this neck portion there are valve seats 2l‘and 22 that face in opposite scribed and as more particularly pointed out in directions away from each other. The spindle 23 ' the appended claims, reference being made to the accompanying drawing that forms a part of this is provided adjacent its ends with splines 24 and 25 that guide the spindle in reciprocal sliding _ speci?cation and wherein the single ?gure is a ' 40 movement in the neck, the said splines also Der longitudinal sectional view taken axiallythrough a valve structure incorporating a preferred em mitting the passage of the?uid in either direc ‘ Mon through said neck; The spindle terminates bodiment of the present invention. adjacent the seats 2| and 22, and at its ends it is The drawing is .to be understood as being of a, more or less schematic character for the purpose provided with check valves 26 and 21 that are alternately engageable with the respective seats of disclosing typical or preferred forms of the 'im 2| and/22 to control ?ow through the outlet stub provements that are contemplated herein. ‘I or the return stub B. These valves 26 and 21 Referring in greater detail to the drawing, a have their chamfered portions facing in opposed hollow‘ housingi of elongate cylindrical shape is directions toward each other. The valve 26, which provided with a lateral high pressure inlet stub 60 has a greater area than that of the valve 21, is 6, an axial high pressure outlet stubs‘! for the preferably a separate element that is anchored ?ow of ?uid from__the pump to an accumulator upon a threaded stub 28 at the adjacent end of or accumulating system (not shown), and a low the spindle by a clamp nut729‘providing for ready pressure return or unloading stub 8 that projects assembly and disassembly. 5' laterally from the housing in a direction opposite 65 Yieldable means are provided to- urge. the re 2,412,428 4 3 ciprocal double check valve assembly in one di ‘rection of its movement; to normally seat the check valve 21 and open the valve 26. These re spective‘positions, which are shown in the draw ing, are such that the ?owing ?uid moves past While this invention has been described in de tail in its present preferred form or embodiment, it will be apparent to persons skilled in the art, after understanding the improvements, that vari ous changes and modi?cations may be made therein without departing from the spirit or scope check valve 26 to pass out of the housing through thereof. ' the high pressure outlet stub and pipe I3 to the, accumulator, while the check valve 21 is closed 1. In an unloading valve arrangement includ due to the action of the yieldable means which is under compression greater than the pressure 10 ing a housing having an inlet port, a high pres We-claim: of the fluid from the pump. ‘ > ‘ sure outlet port, and a low pressure unloading - port. valve seats in said housing at opposite sides The yieldable means above mentioned embodies a toggle having elongate arms 30 and 3| ful-. crumed on a pin 32 mounted in the ears of a yoke , of said inlet ‘port, a double check valve assembly - shown the outer or free end of arm 3|] bears, flow through said low-pressure unloading port cooperating with said seats comprising a recip 33 that is provided‘with disc-shaped seat 34 and 15 rocal spindle, valves on said spindle alternately engageable with said seats, one valve controlling an upstanding post 35. In the arrangement and the other valve controlling ?ow through said against the inner end of a tapered recess 36 in high pressure outlet port, means de?ning a ta the spindle 23 of the reciprocal check valve as sembly, and the free end of arm 3| bears against 20 pered recess extending into said spindle from the back of the'low pressure valve and forming a ‘ the inner end of a tapered recess 31 in a threaded bearing disposed axially between said valves thus vconical plug 38 that is'screwed into the end of improving the balance and stability of operation, the housing adjacent the relief return stub 8. a toggle having a ?rst link engaged at one end The recess 36 extends a considerable distance into in said recessed bearing and having a second link the spindle 23 so that the end of arm 30 has its engaging a'?xed bearing at its other end, and bearing located at a point between the respective resilient means exerting pressureagainst said check valves 26 and,2‘| and beyond the axis of toggletending to extend the same to seat said the inlet check valve. The seating of check valve one valve and to unseat said other valve. 21 provides a stop for arresting the downward 2. In an unloading valve arrangement includ- * movement and prevents straightening of the tog 30 ing a housing having inlet, outlet, and unloading gle thereby preventing the fulcrum 32 reaching ports, a one-way, outward pressure check valve a dead center position. v controlling flow through said inlet port, double The fulcrum or knee of the toggle is urged check valves.connected to each other for simul downward, tending to straighten the arms .30 and taneous operation to effect alternate opening and 3|, by the action of a coiled tension spring39 that closing of said outlet and unloading ports, a is interposed between the disc-shaped seat 34 and toggle engaged at one end wi i said connected a follower 40 that is adjustably mounted in a double check valves; said toggleacting to nor tubular boss 4| 0n the housing above the fulcrum mally open said outlet valve and to seat _Said un-' 32 of the toggle. The follower 4|] has a threaded edge that engages internal threads in the boss 4| 40 loading valve, the seating of said unloading valve providing a stop to limit extendable movement and it has a central aperture 42 that'is provided . of the arms of said toggle in one direction, the with an inwardly projecting lug 43. The means seating of said outlet valve providing a stop to for rotating the follower 40 comprises an eloné limit the collapsing movement of the arms of said gated winding .rod 44 that passes through aper ture 42 and has a longitudinal groove 45 to ac- ‘ commodate the lug 43. A ?anged apertured cap toggle in the opposite direction, said outlet port and said associated valve being provided with cooperating masking surfaces effective to improve the positive opening characteristics of said un 46 screwed upon the upper end of boss 4| pro vides a mounting for the winding rod 44 and per mits rotation of the rod but also prevents longi tudinal movement thereof. The adjustment of ' loading valve, and an adjustable tension spring spring tension is readily accomplished to cause the follower to be moved up or down in the boss arms in said extendable direction of movement. 3. An unloading valve arrangement compris ing a housing having inlet, ‘outlet and unloading 4 . v . . To further insure the completion of opening movement of relief return valve 21, once the same operating against said toggle to urgethe vtoggle ports; an outward pressure check valve control- _ ling said inlet port; valve seats in said housing has been initiated there maybe provided _a pis at opposite sides of said inlet port; a double check ton-like masking surface 26a on pressuredelivery 1 valve unit arranged for reciprocal movement to ' alternately engage said seats thereby to control flow through said outlet port and said unloading inder masking surface 2|a. When the closing _movement of valve 26 has been initiated the 60 port; spring loaded toggle means between said valve unit and a wall of said housing, said toggle masking surfaces'2la and 26a are brought into means being e?ective'to normally seat the un cooperative relation thus restricting the flow past loading port valve, said seating being adapted to valve 26. The corresponding opening of relief ‘ valve 26 cooperating with a complementary cyl return valve 21 causes a momentary drop of pres sure within the reduced neck portion l5 of the housing below that pressure existing on the ac cumulator side of pressure delivery valve 26 with the result that the accumulator pressure acts on ' valve 26 as a piston insuring the movement of the assembly to the rightin the drawing. - limit extensible movement of said toggle means; and cooperating masking surfaces on said outlet port and said outlet valve, said masking surfaces being effective to improve the positive opening , characteristics of said unloading port valve. EDWARD A. ROCKWELL. JAY M. ROTH.