Gate valve apparatus

Details Gate valve apparatus Gate valve apparatus

2005-05-17

2005-05-17

Look, Edward K. (Department: 3751)

Valves and valve actuation

With means to increase head and seat contact pressure

Gate valve

C251S326000

Reexamination Certificate

active

06893001

ABSTRACT:
A gate valve apparatus comprising an elastic seal member inserted into a pipe, a pressure member for elastically deforming the elastic seal member under pressure, a drive shaft for moving the pressure member along the direction of insertion, a movable member for keeping the elastic seal member in pressure contact with the inner wall surface of the pipe, and a support member for supporting the elastic seal member. The elastic seal member is elastically deformed and kept in close contact with the inner wall surface of the pipe thereby to gate the flow path in the pipe. The elastic seal member includes a through hole which is formed nearer to the forward end portion along the direction of insertion than the guide hole of the support member and by way of which the forward end portion of the drive shaft can be inserted. With the movement of the pressure member along the direction of insertion, the first inclined portion and the second inclined portion act to bring the elastic seal member into pressure contact with the inner wall surface of the pipe.

REFERENCES:
patent: 2793831 (1957-05-01), Doster
patent: 2906491 (1959-09-01), Young
patent: 3387818 (1968-06-01), Siepmann
patent: 6283446 (2001-09-01), Sato et al.
patent: GB 779451 (1957-07-01), None
patent: 10 79 409 (1960-04-01), None
patent: 11 03 095 (1961-03-01), None
patent: 12 66 079 (1968-04-01), None
patent: 64-3909 (1989-02-01), None
patent: 7-260015 (1995-10-01), None

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