초록 ▼

A pilot operated control valve has a housing defining an inlet and an outlet. A main valve poppet selectively engages a valve seat to control flow of fluid between the inlet and outlet. An aperture in the main valve poppet opens into a control chamber on a side of the main poppet remote from the val

A pilot operated control valve has a housing defining an inlet and an outlet. A main valve poppet selectively engages a valve seat to control flow of fluid between the inlet and outlet. An aperture in the main valve poppet opens into a control chamber on a side of the main poppet remote from the valve seat. A pilot passage is formed in the main valve poppet with an inlet section between the inlet and the control chamber, and an outlet section between the aperture and the control chamber. A pilot poppet has a body that selectively seals communication between the control chamber and the aperture, and a pressure balancing stem attached to the body extends into the aperture. The pressure balancing stem having a recess which is acted upon by pressure in the outlet section and having an end which is acted upon by pressure in the inlet section. The pilot operated control valve also incorporates a compression check valve and/or a reverse flow check valve.

대표청구항 ▼

[ We claim:] [1.] 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 p

[ We claim:] [1.] 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:an aperture in the main valve poppet and having an opening into the control chamber, the aperture having an interior end in fluid communication with the inlet passage;a pilot passage formed in the main valve poppet, and comprising an inlet section extending between the inlet passage and the control chamber and comprising an outlet section providing a fluid path between the aperture and the outlet passage;a pilot poppet has a poppet body which selectively seals the opening of the aperture, and having a pressure balancing stem attached to the poppet body and extending into the aperture, the pressure balancing stem having a recess which is acted upon by pressure in the outlet section and having an end which is continuously acted upon by pressure in the inlet section; andan actuator operably coupled to move the pilot poppet with respect to the main valve poppet.