Controlled opening pressure compensated flow control valve

摘要

A flow control valve for use in a hydraulic system including a variable orifice for creating a pressure drop to control the rate of fluid flow to a fluid pressure operated device. A pressure compensating device incorporated in the valve is responsive to deviations in pressure drop across the orifice to modulate the flow thereto and thereby maintain a preselected pressure drop across the orifice. Opening of the variable orifice is by inlet pressure against the force of a light spring to an adjustable stop. Retarding opening of the orifice is an expansible chamber having variable volume and connected through an adjustable flow restriction valve to the control valve outlet. Adjustment of the flow restriction valve controls the rate of opening of the variable orifice to reduce pressure shock to the hydraulic system upon initiation of flow.