Relay valve for pneumatic or hydraulic application

Details Relay valve for pneumatic or hydraulic application Relay valve for pneumatic or hydraulic application

1986-02-12

1990-05-22

Kamen, Noah P.

Fluid handling

Systems

Sequentially closing and opening alternately seating flow...

303 221, 303 40, F16K 2100

Patent

active

049269070

ABSTRACT:
A valve including a housing in which is disposed a relay piston. The relay piston has an upper control surface adjacent a control chamber leading to a control connection. The underside of the relay piston is in communication with a reaction chamber leading to a working pressure connection. An outlet valve seat is formed on the lower extremity of the relay piston. A multistage hollow graduated piston disposed within a graduated bore formed in the housing. The graduated piston has a tapered edge extending downwardly to form an inlet valve seat. A hollow valve element is cooperatively associated with the inlet and outlet valve seats to form inlet and outlet valves. The underside of the graduated piston is located in a reaction chamber which is connected to a second control pressure connection. A supply pressure connection is connected to an annular chamber which is in communication with the inlet valve so the working pressure is gradually increased in steps until a predetermined pressure value representing an emergency situation is exceeded which causes the working pressure to immediately rise to the full pressure value of the supply pressure.

REFERENCES:
patent: 3525555 (1970-08-01), Meyer et al.

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