Pressure Seal Valve & Through Conduit Gate Valve Psb valve are designed for high temperature, high pressure and special working conditions such as power plant.excellent sealing together with minimum maintainace are popular by customers. It’s covered with different sizes and rating from 1500lb-2500lb with rf&bw ends. Through conduit gate valve is mainly used for oil&gas pipelines services with its features of dbb structure. It has two types that with through conduit and without slab gate valve.