Patent ID: 6149124
Filing Date: 2000-11-21
Classification: F15B,F16K

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 within 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:a channel in the main valve poppet extending between the inlet passage and the control chamber;a diaphragm operably coupled to the main valve poppet and having a first side against which is applied a first pressure in the control chamber, a second side against which is applied a second pressure in the outlet passage, and a pilot passage between the first and second sides, wherein a difference between the first pressure and the second pressure produces flexing of the diaphragm;a pilot poppet movable with respect to the diaphragm to selectively open and close the pilot passage; andan actuator operably coupled to move the pilot poppet with respect to the diaphragm.