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Plate valve

  • US 4,412,671 A
  • Filed: 11/10/1981
  • Issued: 11/01/1983
  • Est. Priority Date: 11/26/1980
  • Status: Expired due to Term
First Claim
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1. A plate valve comprisinga housing having an inlet spigot with a sealing surface and an outlet spigot with a sealing surface;

  • a valve member movably mounted between a closed position and an open position in said housing between and radially of said spigots, said valve member including at least one closure plate for selectively seating against one of said sealing surfaces to close said spigots from each other in said closed position and an orifice plate for selectively communicating said spigots with each other in said open position; and

    a servo-piston system for moving said valve member in said housing, said system including a pair of cylinders disposed in diametrically opposed relation about said spigots, a first piston disposed in one cylinder to define a first chamber and a second chamber therein, a second piston disposed in the second cylinder to define a third chamber and a fourth chamber therein, said second chamber and said third chamber communicating with said inlet spigot to receive a flowable medium therefrom, each said piston being fixed to said valve member and having a throttle bore extending therethrough to communicate said chambers in a respective cylinder with each other to conduct a throttled flow of medium therebetween, and a pair of valves, each valve selectively connecting an outlet chamber of said chambers in a respective cylinder with a pressure medium at a pressure different from the pressure of the medium in said inlet spigot whereby during movement of said valve member to said open position, one of said valves is opened to permit pressure medium to flow from said first chamber through said one valve while pressure medium flows from said second chamber into said first chamber through said throttle bore in said one piston to create a differential pressure on said one piston sufficient to move said valve member to said open position while pressure medium flows from said third chamber into said fourth chamber through said throttle bore in said second piston; and

    during movement of said valve member to said closed position, the other of said valves is opened to permit pressure medium to flow from said fourth chamber through said other valve while pressure medium flows from said third chamber into said fourth chamber through said throttle bore in said second piston to create a differential pressure on said second piston sufficient to move said valve member to said closed position while pressure medium flows from said second chamber into said first chamber through said throttle bore in said first piston.

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