Method of controlling a swinging boom and apparatus for...

Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow

Reexamination Certificate

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Details

C091S466000

Reexamination Certificate

active

06868672

ABSTRACT:
A swing speed compensation device is provided for use with a flow sharing hydraulic system. The present invention is mounted within the metering spool of a flow sharing valve and includes a poppet that is attached to a spring retainer. The spring retainer encases a compression spring which pushes against a plug and has a drain hole that, depending upon the position of the spring retainer and poppet combination, can vent excess pressure within the present invention to a hydraulic pump tank. When a flow sharing hydraulic system starts or stops, there is a rush in the fluid flow that can cause a spike in the system pressure. The present invention absorbs this pressure spike, allowing for the fluid flow to gradually increase or decrease as the system starts or stops.

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patent: 4878418 (1989-11-01), Badia
patent: 4887643 (1989-12-01), Tomlin et al.
patent: 4953582 (1990-09-01), Kennedy
patent: 5065664 (1991-11-01), Ohta et al.
patent: 5161575 (1992-11-01), Morikawa et al.
patent: 58128488 (1983-08-01), None

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