Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1989-04-04
1991-08-06
Smith, Leonard E.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417470, 137312, 1375123, F04B 3910
Patent
active
050372769
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.
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Flow International Corporation
Smith Leonard E.
Szczecina Jr. Eugene L.
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