Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Reexamination Certificate
2006-03-14
2006-03-14
Jacyna, J. Casimer (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
Reexamination Certificate
active
07011290
ABSTRACT:
A pneumatically controlled needle valve including a cylindrical body intended to be mounted in a bore of a device, two annular sealing surfaces delimiting a chamber connected to a compressed-air supply device, a first compartment arranged inside the body communicatively with the chamber, a second compartment, a piston separating the first and second compartments, a rod having the piston secured thereto, the rod protruding axially from the body, a needle disposed on the rod intended, depending on a position of the needle, to bear or not to bear against a seat of the bore, at least one spring disposed in the second compartment, the spring acting on the rod in a direction for closing the valve by pressing the needle onto the seat, while air under pressure from the compressed air supply device acts on the piston in the opposite direction, the rod passing with sealing through a front end of the body, and a plug for closing a rear end of the body, the plug being connected to the body in such a way as to be prevented from a translational movement but free to rotate thereon, the plug being externally threaded to be screwed into a lapping of the bore.
REFERENCES:
patent: 3904167 (1975-09-01), Touch et al.
patent: 4336826 (1982-06-01), Grawunde
patent: 4585207 (1986-04-01), Shelton
patent: 4778150 (1988-10-01), Pratt et al.
patent: 4874014 (1989-10-01), Grant et al.
patent: 5048578 (1991-09-01), Dorf et al.
patent: 298 14 489 (1999-12-01), None
patent: WO 98/08615 (1998-03-01), None
International Search Report; PCT/FR02/00214; Oct. 6, 2002.
Cantor & Colburn LLP
Eisenmann France Sarl
Jacyna J. Casimer
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