Hold off valve for a two stage servomotor

Details Hold off valve for a two stage servomotor Hold off valve for a two stage servomotor

1974-07-01

1976-02-10

Schwadron, Martin P.

Power plants

Pressure fluid source and motor

Pulsator

91369A, 91391R, 60553, 60589, 188357, B60T 1108, F15B 704

Patent

active

039370216

ABSTRACT:
A hold off valve for use in a two stage pressurizing mechanism to control the transition from a first operational condition to a second operational condition. A stepped piston in the pressurizing mechanism has a first diameter and a second diameter through which an input force sequentially operates a control valve to produce a first operational fluid force and a second operational fluid force in a pressurizing chamber. A relief chamber which is connected to the pressurizing chamber receives the first operational fluid force when the control valve is operated. The hold off valve retains the first operational fluid in the relief chamber until a predetermined pressure build up occurs after which the second diameter independently operates to produce the second operational fluid force.

REFERENCES:
patent: 2880584 (1959-04-01), French
patent: 3062011 (1962-11-01), Brooks
patent: 3473849 (1969-10-01), Smith et al.
patent: 3575001 (1971-04-01), Wilson
patent: 3800539 (1974-04-01), LeMarchand
patent: 3802199 (1974-04-01), Hagberg, Jr.

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