Spool valve apparatus

Details Spool valve apparatus Spool valve apparatus

2006-07-26

2008-12-02

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Biased valve

Springs and spring retainers

C251S129150, C137S625650

Reexamination Certificate

active

07458561

ABSTRACT:
A spring seat, which contacts a spool, is provided between a compression coil spring and the spool. The spring seat is shaped into a cup-shaped body, which includes a cup tubular section, a cup flange section and a cup bottom section and is fitted to a distal end shaft portion of the spool. A spring load of the spring, which is received by the cup flange section, is conducted to a distal end of the distal end shaft portion through the cup tubular section and the cup bottom section. An outer land diameter of each land of the spool is made smaller than a spring diameter of the spring.

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patent: 2005-273810 (2005-10-01), None

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