Flow control valve

Details Flow control valve Flow control valve

2007-07-17

2007-07-17

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

C137S115050

Reexamination Certificate

active

11080662

ABSTRACT:
A spool bore (4) where a spool (6) slides, a concave portion (23) opened to the spool bore (4) and facing a return port12opened to the spool bore (4), and a land portion (11) disposed in an outer periphery of the spool (6) are provided. A width of the concave portion (23) and a width of the return port (12) each are greater than a width of the land portion (11) and a groove bottom (23a) of the concave portion (23) is formed to be a flat plane generally in proportion to an axis line of the spool (6).

REFERENCES:
patent: 3006365 (1961-10-01), Duffy
patent: 3424057 (1969-01-01), Schweizer
patent: 3885583 (1975-05-01), Tennis
patent: 4002027 (1977-01-01), Eley et al.
patent: 4693273 (1987-09-01), Reynolds et al.
patent: 08-074749 (1996-03-01), None

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