Pilot solenoid control valve with pressure responsive diaphragm
AssigneeHUSCO International, Inc.
InventorXiaolong Yang
Life of this patent
Estimating the term…
Abstract
A pilot operated control valve has a body with an inlet and an outlet. A main valve poppet is movable within the body to selectively control flow of fluid between the inlet and outlet. The main valve poppet has a flexible diaphragm with a pilot passage therethrough which is opened and closed by movement of a pilot poppet. The diaphragm flexes due to a pressure differential that acts on the pilot poppet, which flexing compensates for adverse effects that the pressure differential has on the operation of the pilot poppet.
Claims18
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;
- and
- an actuator operably coupled to move the pilot poppet with respect to the diaphragm.
In a control valve having a body with an inlet passage and an outlet passage, a main valve poppet that controls a flow of fluid between the inlet and outlet passages by selectively engaging a valve seat within the body, and a control chamber on a remote side of the main valve poppet from the valve seat, an improvement comprising:
- a channel extending in the main valve poppet between the inlet passage and the control chamber;
- a balancing member engaging 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 variation of a difference between the first pressure and the second pressure produces movement of the balancing member with respect to the main valve poppet;
- a pilot poppet movable with respect to the balancing member to selectively open and close the pilot passage;
- and
- an actuator operably coupled to move the pilot poppet with respect to the balancing member.
Dependencies are inferred from the claim text.