Design of API 6A gate valve seals must accommodate bidirectional sealing, allowing the valve to hold pressure from upstream or downstream directions without performance loss. The seal geometry and loading system are engineered so that line pressure energizes the seats and sealing rings against the gate, improving sealing force with rising pressure and minimizing required mechanical ac... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/