Butterfly-type control valves having non-circular valve members

Details Butterfly-type control valves having non-circular valve members Butterfly-type control valves having non-circular valve members

2005-03-22

2005-03-22

Maust, Timothy L. (Department: 3751)

Valves and valve actuation

Rotary valves

Butterfly

C123S337000

Reexamination Certificate

active

06869064

ABSTRACT:
A butterfly-type control valve (1) includes a valve housing (2) that is molded from synthetic resin. The valve housing has a housing wall that defines a flow path (3). A non-circular valve member (5) is disposed within the flow path and has opposing long sides (5a). The valve member (5) is mounted on a valve shaft (4) that is rotatably supported by the valve housing. The housing wall has wall portions (2a) that extend substantially parallel to the long sides (5a) of the valve member. Each of the wall portions (2a) has an inner surface (2a1) that is concave in a direction away from the valve shaft in a state after the valve housing has been molded and before the valve housing has been cooled.

REFERENCES:
patent: 6793197 (2004-09-01), DePenning et al.
patent: 19848440 (2000-04-01), None

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