Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1993-01-08
1994-11-08
Bertsch, Richard A.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417571, 1375123, F04B 2102
Patent
active
053622162
ABSTRACT:
A positive displacement pump wherein the housing has a thin one-piece plate-like head bolted to the adjacent end of a casing for one or more reciprocable plungers. Each plunger is coaxial (a) with a suction intake valve installed in a larger-diameter portion of a two-part insert in the casing adjacent the head, and (b) with an outlet valve installed in a recess of the head adjacent a second portion of the insert. The second portion of the insert is surrounded by an annular space which communicates with a main suction chamber of the pump to return into the suction chamber any fluid leaking between the two portions of the insert. The second portion has a first seat disposed at one end of an axial channel and forming part of the intake valve, and a second seat disposed at the other axial end of the channel and forming part of the outlet valve. The second seat is disposed at or in the plane of abutment between the head and the casing of the pump housing, and the axial length of the reciprocable valving element of the outlet valve equals or is slightly less than the thickness of the one-piece head. The recess of the head serves to convey pressurized fluid to one or more consumers.
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Bertsch Richard A.
McAndrews, Jr. Roland G.
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