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Gate valve

  • US 4,706,934 A
  • Filed: 08/22/1986
  • Issued: 11/17/1987
  • Est. Priority Date: 08/22/1986
  • Status: Expired due to Fees
First Claim
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1. A gate valve comprising:

  • a body which defines a flow passage aligned with a flow axis;

    a pair of spaced valve seats mounted to the body around the flow passage, each valve seat defining a seat face canted at a small angle with respect to a reference plane perpendicular to the flow axis;

    a wedge having an end face and two spaced wedge faces rigidly positioned with respect to one another, said wedge faces converging in a first, valve closing direction and diverging in a reverse, valve opening direction;

    means for moving the wedge transverse to the flow axis in the valve closing and valve opening directions;

    first and second gates, each comprising a respective flange positioned to overlie the end face of the wedge and a respective convex thrust pad positioned to bear against a respective wedge face; and

    at least two springs, each mounted between the wedge and a respective one of the flanges to bias the flanges away from the wedge.

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