Low discharge slurry valve seal

摘要

A gate valve seal for a gate valve including a body having an inlet aperture and an outlet aperture, and a gate closure reciprocally disposed within the body between a closed valve position where the gate closure blocks the apertures and an open valve position where the gate closure does not block the apertures. The seal includes a first resilient seat for placement in the inlet aperture of the gate valve body and a second resilient seat for placement in the outlet aperture of the gate valve body. The seats sealingly engage one another and the gate closure when the closure cycles between the valve positions. Each of the seats includes an inner diametrical surface which generates sealing pressure that increases as internal pipeline pressure increases.