Hydraulic velocity and acceleration control system

Details Hydraulic velocity and acceleration control system Hydraulic velocity and acceleration control system

1978-04-12

1980-08-05

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

13762563, F15B 13042, F16K 1100

Patent

active

042156238

ABSTRACT:
A hydraulic control system particularly suitable for controlling the acceleration and velocity of a load such as the plunger of die casting equipment is described. The load is controlled by a hydraulic ram which in turn is controlled by a main valve of the kind in which the rate of flow of fluid to the load is directly proportional to the rate of flow of pilot fluid thereto. Pilot fluid flows through an auxiliary valve and a restrictor. The restrictor is adjusted to determine the maximum rate of flow and the rate at which the auxiliary valve opens is adjusted to determine the rate of change of flow.

REFERENCES:
patent: 2400126 (1946-05-01), Matthews
patent: 2582088 (1952-01-01), Walthers
patent: 2830785 (1958-04-01), Buri
patent: 2980073 (1961-04-01), Arbogast
patent: 2993477 (1961-07-01), Panissidi
patent: 3129645 (1964-04-01), Olmsted
patent: 3234857 (1966-02-01), Castelet
patent: 3561488 (1971-02-01), Byers
patent: 3643696 (1972-02-01), Christensen et al.

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