Pilot operated four way valve

Details Pilot operated four way valve Pilot operated four way valve

1977-06-03

1979-10-02

Schwadron, Martin P.

Fluid handling

Systems

Supply and exhaust

91 4R, 13759615, F15B 13042

Patent

active

041694902

ABSTRACT:
A pilot valve for reversing the flow of fluid in a pair of pipes. The valve is less complex than prior art devices serving the same purpose, comprising in essence four aligned rolling diaphragm devices which are automatically controlled by the presence, or absence, respectively of pilot pressure. If pilot pressure is present, a flow of fluid under pressure is established in one of two pipes and the other is vented. On the other hand, if pilot pressure is removed, the pipe in which a flow of fluid under pressure had been established is vented and a flow of fluid under pressure is established in the pipe which has been previously vented. The output of the pipe in which a flow of pressure is established may be used to operate and to reverse the operation of a cylinder and piston machine, such as, for instance, a pneumatic or fluid motor.

REFERENCES:
patent: 3016918 (1962-01-01), Wentworth
patent: 3080887 (1963-03-01), Brandenberg

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