Parallel slide gate valve

A parallel slide gate valve uses one or two flat closure members with parallel seating faces that travel along guides to open or isolate the flow path. Its seal does not depend on the wedging action used by a conventional wedge gate valve, which is the defining sibling distinction. Its body, guiding arrangement, and service intent also differ from the thin blade of a knife gate valve. Selection should examine disc arrangement, thermal transients, pressure direction, operating force, binding risk, and any design-specific bypass or pressure-equalization requirement.