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Roll seal control valve

  • US 6,276,658 B1
  • Filed: 04/04/2000
  • Issued: 08/21/2001
  • Est. Priority Date: 08/06/1993
  • Status: Expired due to Fees
First Claim
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1. In a diaphragm control valve, including:

  • a) a housing having an inlet, an outlet, and a passageway for the flow of liquid from the inlet to the outlet, the passageway surrounded by a valve seat having a seat sealing surface;

    b) a valve member including a diaphragm within the housing, the diaphragm displaceable towards or away from said valve seat to control the flow therethrough;

    c) the housing further including a rigid cover between the outlet and passageway, a control chamber is formed between the cover and the diaphragm, and the cover attached to the housing by slotted grillwork surrounding the valve seat;

    d) the diaphragm includes an outer flexible peripheral section secured to the cover and in alignment with said valve seat, a valve-closure section having a valve sealing surface surrounding a center area, the valve-closure section displaceable with respect to the valve seat for controlling the flow therethrough, e) the valve sealing surface contacting the seat sealing surface when the valve member is fully closed; and

    f) a pilot valve fluidly connected to the control chamber;

    an improvement comprising;

    g) a liquid passageway across the sealing surfaces when the valve is fully closed, h) the slotted grillwork includes vanes, each vane having a diaphragm side and a downstream side and each vane extends from the valve seat to the housing thus forming a slot between adjacent vanes, i) said diaphragm pressed against the diaphragm side of the vanes when fully closed, j) said liquid passageway having a width less than the width of two slots, k) a closure at the vane downstream side of all slots having access to said liquid passageway, l) an opening in each closure, and m) a check valve over the opening.

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