Flow rate control valve

Details Flow rate control valve Flow rate control valve

2006-06-06

2006-06-06

Bastianelli, John (Department: 3751)

Valves and valve actuation

Rotary valves

Butterfly

C123S337000

Reexamination Certificate

active

07055800

ABSTRACT:
A flow rate control valve1comprises a first sleeve4and a second sleeve5fitted into an inner periphery of a housing3. The both sleeves4and5have inner end faces4dand5dwhich are disposed in abutment against each other while being displaced from each other radially, thereby forming annular stepped end faces4d′ and5d′ on a common plane. An edge of the stepped end faces define a first seat S1. The valve body6has an outer peripheral surface which is formed as a beveled surface, which defines a second seat S2. The second seat S2of the valve body6is disposed in linear contact with the first seat S1to close a flow path in a gas passage2.With this arrangement, a seal leakage when a butterfly valve7is closed can be reduced in comparison to the prior art.

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patent: 5979872 (1999-11-01), Stearns et al.
patent: 6193214 (2001-02-01), Schatz
patent: 6338467 (2002-01-01), Mabboux et al.
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patent: 2001-004038 (2001-01-01), None
patent: 2002-54512 (2002-02-01), None

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