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QUICK-ACTING GATE VALVE

  • US 3,785,612 A
  • Filed: 10/06/1972
  • Issued: 01/15/1974
  • Est. Priority Date: 10/25/1971
  • Status: Expired due to Term
First Claim
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1. In a quick-acting gate valve having a valve disc which when closed is pressed by a spring onto a valve seat and which is connected by a valve stem to a holding member, and wherein the valve may be opened by a piston pneumatically displaceable in a cylinder against the force of said spring and which is adapted to be kept open by coupling means which have to be released to initiate the closing process, the improvements characterized in that the spring acts upon the piston provided with coupling means for the holding member, the holding member is held in the coupling position by the coupling means on the side of the piston facing the valve disc against an initial stressing force less than the force of the spring, a central part of the holding member sealing off a bore, which when the coupling means is released, connects a cylinder chamber facing the valve disc and permanently connected to a fluid pressure source with a cylinder chamber facing away from the valve disc and adapted to be connected to the atmosphere via an air vent valve in order to bring the piston together with the holding member coupled to it and the valve disc into an open position.

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