Three-port valve

Details Three-port valve Three-port valve

1997-01-09

1999-07-27

Michalsky, Gerald A.

Fluid handling

Systems

Sequentially closing and opening alternately seating flow...

13759617, F16K 1114

Patent

active

059273348

ABSTRACT:
A three-port valve capable of switching flow paths from one to another without undesired communication between the switched flow paths. A first valve seat (55) and a second valve seat (56) are disposed opposite to each other in a central valve chamber (42). A first passage (49) extending through the first valve seat (55) is communicated with a first port (45). A second passage (51) extending through the second valve seat (56) is communicated with a second port (47). The central valve chamber (42) is communicated with a third port (46). A valve body having a first seal surface (76) and a second seal surface (77) is disposed between the first valve seat (55) and the second valve seat (56). The distance between the first and second seal surfaces (76 and 77) of the valve body is variable. At least one of the seal surfaces (76 and 77) of the valve body is always placed in close contact with the first valve seat (55) or the second valve seat (56). At a stage in a switching operation of the valve, both the two seal surfaces (76 and 77) of the valve body are placed in close contact with the first and second valve seats (55 and 56), respectively.

REFERENCES:
patent: 2969811 (1961-01-01), Freeman
patent: 3043336 (1962-07-01), Parent et al.
patent: 3357454 (1967-12-01), Koutnik
patent: 3461913 (1969-08-01), Scott
patent: 3605813 (1971-09-01), Nakano et al.
patent: 3921666 (1975-11-01), Leiber
patent: 3989063 (1976-11-01), Brouwers et al.
patent: 4494559 (1985-01-01), Kawamura
patent: 4526203 (1985-07-01), Leiber
patent: 4922966 (1990-05-01), Kaes et al.
patent: 5207245 (1993-05-01), Maranzano
patent: 5567023 (1996-10-01), Yoo

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