Combined check and control valve

Details Combined check and control valve Combined check and control valve

2008-07-10

2011-11-01

Fristoe, Jr., John (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

C251S061000, C251S083000

Reexamination Certificate

active

08047502

ABSTRACT:
To overcome problems concerning the sticking of the check plate in a combined check and control valve, a stop is provided on the valve rod or a guide element in the vicinity of the valve rod, whose distance to the limiting element is smaller than the maximum stroke and larger than the nominal stroke of the limiting element. Thus, it is achieved that the check plate is released from the valve seat by means of the stop, when the valve rod is displaced to the maximum.

REFERENCES:
patent: 4836241 (1989-06-01), Schoenwald
patent: 5203872 (1993-04-01), Naffziger
patent: 5284180 (1994-02-01), Guo et al.
patent: 5984263 (1999-11-01), Hosoya
patent: 6752171 (2004-06-01), Kemmler et al.
patent: 9415251.9 (1994-09-01), None
patent: 102007031957.8 (2008-03-01), None
patent: 4025267 (2008-10-01), None
patent: 55049519 (1980-04-01), None
patent: 2196121 (1990-08-01), None

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