Patent ID: 6314980
Filing Date: 2001-11-13
Classification: G05D,Y10T

Abstract:
A pressure compensating flow control device comprising:a housing having a upper body and a lower body wherein the upper body is sized to matingly engage the lower body;a piston chamber formed in the housing for receiving a piston in sliding engagement, the piston chamber has a top surface, a bottom surface and at least one side wall;a fluid inlet defined by portions of the lower body;a fluid outlet defined by portions of the upper body;a reducing valve situated inside the lower body wherein the reducing valve has portions defining a valve seat formed on a bottom surface of the reducing valve;a valve stem situated in the reducing valve that modulates relative to fluid pressure whereby the reducing valve prevents fluid communication between the fluid inlet and the fluid outlet when in a closed position and allows fluid communication between the fluid inlet and the fluid outlet when in an open position;a piston situated in the piston chamber wherein the piston slides within the housing and contacts the reducing valve and causes modulation of the reducing valve;a piston rod aperture formed in the piston for receiving a piston rod in sliding engagement;a piston rod situated in the piston chamber which has a channel provided therein to provide fluid communication between the inlet and the outlet;a reference spring which registers on the top surface of the piston chamber and a top surface of the piston wherein the reference spring has an axial load compression that creates a pressure differential; and,a needle valve for controlling fluid-flow rate and providing a set pressure differential.