Fluid flow control devices

Details Fluid flow control devices Fluid flow control devices

1977-04-13

1979-10-09

Cohen, Irwin C.

Brakes

Internal-resistance motion retarder

With means for locking parts together temporarily

91437, 137118, 13759615, 267 11A, 267 65D, 280709, 280714, B60G 2500, F16F 932, G05D 1100

Patent

active

041702794

ABSTRACT:
A fluid flow control device suitable for controlling the flow of fluid between two chambers of a jack comprises a valve between each of the two chambers being controlled and a common chamber. The valves are controlled by pilot operated stops which, when retracted permit the valves to close fully but which, when extended hold the valves partially open. A source of make-up fluid can be connected to the common chamber, and the feed to the pilot valves can be tapped off the common chamber by way of a restriction. Alternatively, the pilot valves can be isolated from the common chamber and a separate source of pilot fluid provided. In this case, the common chamber can be permanently connected to a source of fluid under pressure which can be a fluid pressure accumulator.

REFERENCES:
patent: 3026103 (1962-03-01), Gates
patent: 3274902 (1966-09-01), Kleckner
patent: 3381587 (1968-05-01), Parquet
patent: 3795178 (1974-03-01), Roche
patent: 3908515 (1975-09-01), Johnson
patent: 4034815 (1977-07-01), Delelan

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