Patent ID: 6053473
Filing Date: 2000-04-25
Classification: F02M,F16K

Abstract:
A valve apparatus comprising:a valve stem having, at its forward end, a valve plug which faces a fluid flow passage;a drive unit for displacing said valve stem to open and close said fluid flow passage; anda coupling means for coupling said valve stem and said drive unit to one another, wherein:said drive unit comprises a plunger for being energized to move at least in a first direction along an axial direction of said valve stem;said valve stem comprises a retainer-fastening section; andsaid coupling means comprises:a retainer fastened to said retainer-fastening section, for making, with its first surface, abutment against a first surface of said plunger to displace said valve stem in said first direction together with said plunger;an elastic member for making abutment against a second surface of said retainer to perform an energizing action to move said valve stem in a second direction along said axial direction of said valve stem by the aid of said retainer; anda retainer-fixing mechanism for fixing said retainer to said retainer-fastening section to prevent said retainer from displacement with respect to said valve stem.