Pressure attenuated pump piston

Details Pressure attenuated pump piston Pressure attenuated pump piston

2011-05-10

2011-05-10

Leslie, Michael (Department: 3745)

Expansible chamber devices

Piston

With fluid passage in piston face

C092S129000, C092S183000

Reexamination Certificate

active

07938059

ABSTRACT:
A pump piston assembly for use with a high-pressure pump includes a first section extending axially from a first end, a second section positioned adjacent to the first section and extending axially towards a second end, and an attenuation feature disposed within the piston bore such that the attenuation feature is part of the second end. By integrating the attenuation feature directly into the pump piston, pressure spikes, such as pressure peaks and valleys of an oscillatory pressure wave originating from the reciprocating motion of the piston, may be compensated directly in a supply pressure chamber. By providing a variety of attenuation features, such as a ball/spring assembly, an elastomer insert, an elastomer insert/internal piston assembly, and an elastomer insert/spring/ball assembly, attenuation for applications with a variety of frequencies and pressures can be utilized.

REFERENCES:
patent: 2968287 (1961-01-01), Creighton
patent: 3896707 (1975-07-01), Holmstrom
patent: 5236253 (1993-08-01), Glasmacher
patent: 5551767 (1996-09-01), Linkner, Jr.
patent: 6093003 (2000-07-01), Hauser et al.
patent: 6595105 (2003-07-01), An et al.

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