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US 5,037,276 AGranted
High pressure pump valve assembly
AssigneeFlow International Corporation
InventorOlivier L. Tremoulet, Jr.
Life of this patent
Estimating the term…
Abstract
A high pressure fluid pump having a reciprocating piston which pumps fluid through a central passageway in a valve body of a valve assembly. The valve body forms with an end section of the housing a high pressure fluid chamber axially aligned with the piston. The effective pressure area in the valve chamber acting on the valve body is greater than the effective pressure area acting on the valve body from the cylinder chamber in which the piston reciprocates, so that a net rearward force is exerted on the valve body. There are forward and rear seal members around the valve body which are caused to come into sealing engagement due to fluid pressure in the valve chamber.
Claims46
A high pressure pump assembly comprising:
- a. a housing structure having a forward end, a rear end, a longitudinal center axis, and comprising a rear cylinder section defining a high pressure longitudinally aligned cylinder chamber, and a forward end section;
- b. a piston mounted for reciprocating motion in said cylinder chamber on a forward high pressure discharge stroke and a rearward intake stroke;
- c. a valve assembly mounted at a forward end of said cylinder section and providing at least a fluid outlet leading from said cylinder chamber, said valve assembly comprising a valve body member having a rear portion in sealing engagement with a forward portion of said cylinder section, and a forward portion in sealing engagement with said end section of the housing structure;
- d. said valve body and said end section forming a high pressure valve chamber located at a forward side of said valve body and arranged to receive high pressure fluid from said cylinder chamber;
- e. said valve body having a forward fluid pressure surface means with an effective first rearwardly acting pressure surface area exposed to pressure from fluid in said valve chamber, and a second rear fluid pressure surface means with an effective second forwardly acting pressure surface area exposed to pressure from fluid in said cylinder chamber;
- f. said first rearwardly acting pressure surface area being greater than said second forwardly acting pressure surface area in a manner that a net rearward pressure force is exerted on said valve body to cause said valve body to be urged into sealing engagement with said cylinder section;
- and
- g. a forward seal member located at an interface of the forward portion of the valve body and the end section of the housing structure, said forward seal member being arranged so that fluid pressure in said valve chamber acts on said forward seal member to tend to move the forward seal member into sealing engagement between said valve body and said end section of the housing structure.
5 more elements
A high pressure pump assembly comprising:
- a. a housing structure having a forward end, a rear end, a longitudinal center axis, and comprising a rear cylinder section defining a high pressure longitudinally aligned cylinder chamber, and a forward end section;
- b. a piston mounted for reciprocating motion in said cylinder chamber on a forward high pressure discharge stroke and a rearward intake stroke;
- c. a valve assembly mounted at a forward end of said cylinder section and providing at least a fluid outlet leading from said cylinder chamber, said valve assembly comprising a valve body member having a rear portion in sealing engagement with a forward portion of said cylinder section, and a forward portion in sealing engagement with said end section of the housing structure;
- d. said valve body and said end section forming a high pressure valve chamber located forwardly of said valve body and arranged to receive high pressure fluid from said cylinder chamber;
- e. a rear seal member at an interface of said cylinder section and the rear portion of the valve body, said rear seal member having first and second rear contact surfaces to engage said cylinder section and said valve body, respectively, with said rear contact surfaces being arranged so that a rearward force on said valve body tends to press said rear seal member into sealing engagement between said cylinder section and said valve body.
2 more elements
A high pressure pump assembly comprising:
- a. a housing structure having a forward end, a rear end, a longitudinal center axis, and comprising a rear cylinder section defining a high pressure longitudinally aligned cylinder chamber, and a forward end section;
- b. a piston mounted for reciprocating motion in said cylinder chamber on a forward high pressure discharge stroke and a rearward intake stroke;
- c. a valve assembly mounted at a forward end of said cylinder section and providing at least a fluid outlet leading from said cylinder chamber, said valve assembly comprising a valve body member having a rear portion in sealing engagement with a forward portion of said cylinder section, and a forward portion with a forward and inwardly tapering forward contact surface in sealing engagement with said end section of the housing structure;
- d. said valve body and said end section forming a high pressure valve chamber located forwardly of said valve body and arranged to receive high pressure fluid from said cylinder chamber;
- e. a forward seal member located at an interface of the forward contact surface of the valve body and the end section of the housing structure, said forward seal member being arranged so that fluid pressure in said valve chamber acts on said forward seal member to tend to move the forward seal member into sealing engagement between the forward contact surface of said valve body and said end section of the housing structure.
2 more elements
Dependencies are inferred from the claim text.