Plug valve

Details Plug valve Plug valve

2005-04-05

2005-04-05

Jacyna, J. Casimer (Department: 3751)

Valves and valve actuation

Rotary valves

Plug

C251S900000, C251S904000

Reexamination Certificate

active

06874759

ABSTRACT:
A main valve body has a first passage, a second passage, and an opening which intersects the first passage and the second passage. A main plug body is rotatably inserted into the opening, and has an upper section into which a handle is inserted, and a lower section having a through-hole. An O-ring is seated on an annular groove which is provided in the vicinity of the through-hole. A seal-retaining member for preventing the O-ring from projecting is fitted to an expanded diameter section of the first passage. One end of the seal-retaining member tightly contacts an end surface of the expanded diameter section. A curved surface corresponding to an inner circumferential surface of the opening is formed at the other end of the seal-retaining member.

REFERENCES:
patent: 4890817 (1990-01-01), Uri
patent: 5188144 (1993-02-01), Radossi
patent: 5327929 (1994-07-01), Radossi
patent: 5-215250 (1993-08-01), None

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