Pneumatically actuated valve

Details Pneumatically actuated valve Pneumatically actuated valve

2006-01-31

2006-01-31

Jacyna, J. Casimer (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

C251S029000, C251S063500, C251S030020, C251S030030, C251S129030, C251S291000

Reexamination Certificate

active

06991211

ABSTRACT:
A pneumatically actuated fluid control valve includes a piston and a piston actuator including a permanent magnet. First and second piston actuator positions for magnetically disposing the piston in valve open and valve closed positions are provided. A pneumatic actuator driving circuit pneumatically moves the piston actuator from one to the other of first and second piston actuator positions to dispose the piston in the open and closed positions. The valve includes an annular valve assembly. One valve assembly position is a normally closed position and a positive air flow control signal moves the piston to open the valve. Another valve assembly position is a normally open position and a positive air flow control signal moves the piston to close the valve.

REFERENCES:
patent: 3379214 (1968-04-01), Weinberg
patent: 3517699 (1970-06-01), Marcum
patent: 4630645 (1986-12-01), Spa
patent: 4942852 (1990-07-01), Richeson et al.
patent: 4964424 (1990-10-01), Helbig et al.
patent: 2001/0050705 (2001-12-01), Hoen et al.
patent: 0 715 109 (1996-06-01), None

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