Patent ID: 6073652
Filing Date: 2000-06-13
Classification: F15B,F16K,Y10T

Abstract:
In a pilot operated control valve having a body defining an inlet passage and an outlet passage, a main valve poppet selectively engaging a valve seat of the body to control flow of fluid between the inlet and outlet passages, and a control chamber on a side of the main valve poppet remote from the valve seat, an improvement characterized by:the main valve poppet having a pilot passage provides a fluid path between the outlet passage and an opening into the control chamber;one of the body and the main valve poppet having a passageway extending between the inlet passage and the control chamber;a pilot poppet which selectively seals the opening of the pilot passage into the control chamber, and having a bleeder passage extending between the control chamber and a cavity on a side of the pilot poppet that is remote from the control chamber;a pressure transducer coupled to the body to sense pressure in the cavity; andan actuator operably coupled to move the pilot poppet with respect to the main valve poppet.