Dual-solenoid safety valve

Details Dual-solenoid safety valve Dual-solenoid safety valve

1975-07-25

1977-08-16

Cline, William R.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91424, 91450, 91459, 137554, 137556, F15B 1108, F15B 1304

Patent

active

040418421

ABSTRACT:
A safety control valve for pneumatically operated cyclic machines, such as power presses and press brakes, including a pair of solenoid valves connected to a pneumatic pressure source and adapted to operate as a series flow when the system is on, and a parallel exhaust when the system is off, and with either of said solenoid valves blocking communication to the pneumatically operated cyclic machine when such valve is not operated.

REFERENCES:
patent: 2231583 (1941-02-01), Konig
patent: 2459902 (1949-01-01), Tucker
patent: 2831466 (1958-04-01), Stueland
patent: 3170484 (1965-02-01), Benz et al.
patent: 3270625 (1966-09-01), Huntington
patent: 3411411 (1968-11-01), Fleck
patent: 3564842 (1971-02-01), Van Marle
patent: 3605554 (1971-09-01), Philbrick
patent: 3698617 (1972-10-01), Fukaya
patent: 3706321 (1972-12-01), Vicari
patent: 3763744 (1973-10-01), Fournell
patent: 3813990 (1974-06-01), Coppola
patent: 3943972 (1976-03-01), Bitonti et al.

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