Patent ID: 6764060
Filing Date: 2004-07-20
Classification: F16K

Abstract:
A flow rate control valve comprising:a rotary driving source rotatably driven by an electric signal; a detector for detecting an amount of rotation of said rotary driving source; a first movable member screwed in a screw hole formed in a main body and being displaceable in an axial direction of said screw hole under a rotary action of said rotary driving source; a second movable member abutting against an end surface of said first movable member for being displaced together with said first movable member; and a valve plug connected to an end of said second movable member for closing a fluid passage when seated on a valve seat, wherein an opening degree of said valve plug is adjusted by controlling an axial displacement amount of said first movable member based upon said amount of rotation of said rotary driving source, and wherein a spring member is fastened to a flange of said second movable member, said first movable member is pressed to displace said second movable member against spring force of said spring member, and thus said valve plug is seated on said valve seat, and said second movable member is displaceable in an opposite direction by said spring force of said spring member, and thus said valve plug is separated from said valve seat.