Post-pressure compensator assembly for fluid control valve

Details Post-pressure compensator assembly for fluid control valve Post-pressure compensator assembly for fluid control valve

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 21/00 (2006.01) F15B 13/04 (2006.01) G05D 16/10 (2006.01)

Patent

CA 2108616

ABSTRACT OF THE DISCLOSURE A post-pressure compensator assembly for a fluid control valve includes a compensator piston disposed in a stepped bore of a valve body. The piston is formed having an enlarged rim portion on the upper end thereof. A spring reacts between a cap threaded into the bore and the piston, urging it downwardly such that the rim portion of the piston normally seats on the step of the bore. The outer diameter of the rim portion is slightly smaller than the inner diameter of the upper portion of the bore. Also, a plurality of notches are formed on the lower surface of the rim portion, adjacent to the step of the bore. Thus, fluid can flow freely about and beneath the rim portion of the piston to prevent it from becoming hydraulically locked in position during use. A load sense passageway is formed through the valve body which communicates with similar load sense passageways formed in the other portions of the fluid control valve. A check valve structure is provided in the piston which permits the one-way flow of fluid from the selected outlet work port to the load sense passageway, thus creating a signal which is representative of the fluid pressure at the work port. The check valve prevents the fluid pressure signals of each of the work sections from interfering with each other.

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