| 摘要 |
A valve having an internal cylindrical sealing surface and a plurality of spaced apart port openings, a gate member positioned in the body dividing it into two flow chambers, the gate member having opposed longitudinal sides and semicircular portions providing a continuous sealing surface, the gate member having spaced apart continuous grooves formed in the sealing surface, a continuous gasket member supported in each of the gate member grooves providing, when the gasket members are expanded by pressure applied externally of the valve, sealing engagement with the valve sealing surface, and an elongated gasket retaining plate affixed to each longitudinal side of the gate member, each gasket retaining plate being configured to form a portion of a groove in the gate member, the width of each groove being narrower at the contact surface than the diameter of the gasket member to prevent the gasket member from being dislodged.
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