Patent ID: 6021997
Filing Date: 2000-02-08
Classification: F15B,F16K

Abstract:
A proportional control valve, comprisinga valve body with a valve intake and a valve outlet;a main piston mounted for reciprocal movement in said valve body between an open position allowing fluid flow through said valve body from said valve intake to said valve outlet and a closed position blocking fluid flow between said valve intake and said valve outlet, said main piston having a feed opening in continuous fluid communication with said valve intake;a servo-control piston coupled to said main piston, and having a longitudinal channel extending therethrough and a stop collar;discharge openings in said main piston closable by said servo-control piston and opening directly on said valve outlet;a solenoid including an electromagnet and a cylindrical armature movably mounted relative to and responsive to said electromagnet and connected to said servo-control piston for movement therewith, said armature having a receiving chamber in continuous fluid communication with said valve intake through said longitudinal channel and through an attenuation opening in said armature and having a radial cutout receiving said stop collar with some radial play; anda first locking spring in said receiving chamber and biasing said armature and said servo-control piston away from said electromagnet.