Fluid control valve

Details Fluid control valve Fluid control valve

1996-02-09

1998-03-17

Lee, Kevin

Valves and valve actuation

Valve

Materials

251332, 251903, F16K 2500

Patent

active

057277761

ABSTRACT:
Needle valves which are seated in valve seats defined by circular edges have DELRIN.RTM. tips for the purpose of minimizing unseating torque which would otherwise be excessive due to the thermal expansion and contraction characteristics of the valve seats and the needle valves. In salt spreaders with aluminum valve seats and steel needle valves, the needle valves become stuck in the valve seats if the needle valves are seated after operation in frigid weather and the salt spreaders are subsequently garaged to raise the temperature of the valve seat and needle valves. By utilizing the DELRIN.RTM. tips, the needle valves do not become stuck.

REFERENCES:
patent: 3137475 (1964-06-01), Schoenecker et al.
patent: 3236256 (1966-02-01), Valentine
patent: 3326520 (1967-06-01), Guenther
patent: 3340893 (1967-09-01), Lockwood
patent: 3445089 (1969-05-01), Murray
patent: 3531086 (1970-09-01), Shannon
patent: 3955792 (1976-05-01), Cho
patent: 4023774 (1977-05-01), Kojima
patent: 4196886 (1980-04-01), Murray
patent: 5060910 (1991-10-01), Iwata et al.
patent: 5249773 (1993-10-01), Feld
patent: 5370357 (1994-12-01), Jones

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