Check valve

Details Check valve Check valve

2003-09-15

2008-11-11

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S533250

Reexamination Certificate

active

07448408

ABSTRACT:
An inlet, a valve chest having a diameter larger than that of the inlet, and an outlet are formed in a valve casing. An annular valve seat is formed between the inlet and the valve chest. A valve element for opening and closing the annular valve seat is disposed within the valve chest. A valve stem is projectingly provided on the inlet side of the valve element. A guide member with which an outer periphery of the valve stem comes into sliding contact is provided at inner ends of ribs which project into the valve chest from an inner wall of the inlet. A recess is formed in the valve element to receive therein the ribs projecting to the valve element and also to receive the guide member.

REFERENCES:
patent: 170974 (1875-12-01), Westwater
patent: 384514 (1888-06-01), Dowson et al.
patent: 693133 (1902-02-01), Hennebohle
patent: 1013093 (1911-12-01), Reeve
patent: 1470018 (1923-10-01), Love et al.
patent: 1828697 (1931-10-01), Yardley
patent: 1950575 (1934-03-01), Smolensky
patent: 2134803 (1938-11-01), Rose
patent: 2356360 (1944-08-01), Smolensky
patent: 2377938 (1945-06-01), Hoffman
patent: 2447729 (1948-08-01), Bertea
patent: 3035604 (1962-05-01), Portis
patent: 4215717 (1980-08-01), Trosch
patent: 10 30743 (1998-02-01), None

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