Pilot operated valve with variable piston orifice

Details Pilot operated valve with variable piston orifice Pilot operated valve with variable piston orifice

2005-12-06

2005-12-06

Bastianelli, John (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S035000, C251S038000, C251S118000

Reexamination Certificate

active

06971625

ABSTRACT:
A valve assembly having a valve body, a piston, a modulating plug, a valve cover adjoining the valve body, and a throttling member. The valve body has an inlet and outlet port, a partition with a valve seat separating the valve body into a first and second flow passage. The piston has a throughbore including an orifice, reciprocably mounted in the valve body and movable between a first and second position. The modulating plug, in abutting contact with the piston and reciprocably mounted in the valve body, gradually moves between an open position, permitting a main fluid flow, and a closed position engaging the valve seat, blocking the main fluid flow. The throttling member is adapted to insure a gradual alteration of the cross-section of the orifice upon piston movement. A method of gradually opening the valve assembly modulating plug is also set forth.

REFERENCES:
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patent: 2694544 (1954-11-01), Hall
patent: 3020925 (1962-02-01), Randall et al.
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patent: 5738332 (1998-04-01), Perez Corbalan
patent: 6105608 (2000-08-01), Katzman
CDS Electric Evaporator Control Valves, Bulletin 100-40, May 2000.
Sealed Motor Valve, Bulletin R629a, Feb. 2002.
Electric Pilot Regulator Type A4AJ, Bulletin 23-12D, Feb. 2000.
Electrically Compensated Pressure Regulators, Bulletin 23-11, Jan. 1997.
Inlet Pressure Regulators, Bulletin 23-05, Feb. 1991.

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