Specifications: The sealing surface of valve seat and gate is overlaid (surfaced) with hard alloy, resistant to corrosion and abrasion. Valve seat, gate and stem are sealed with imported lip-shaped combined seal structure, so they are safe and reliable, and the switching torque of valves is low. Simple and safe design of valve gate and seat, makes it easy to change without special tools. Non-rubber seal effectively protects valve chamber from mud, sand and rock, etc. Stem sealing can be changed under pressure. Stem is designed to be rising stem and non-rising stem, with a clear sign for valve opening. Drive mode falls into manual, hydraulic and gear. Combining type falls into flange, thread and hub.