Gate valve inlcude Manual Flat Gate Valve – Rising Stem，Manual Gate Flate Valve – non-rising stem，Hydraulic Gate Valve，Hydraulic Gate Valve – manual locking, whcih are available in tempera- ture classes L, P, R, S, T, U type specified in API Spec 6A. Gate valve to be used in 350℃ or 650℃for high temperature service can be supplied on request. Fire- proof gate valves also can be supplied to API 6A. Gate valves manufactured by our company are available in 2000psi, 3000psi, 5000psi, 10000psi and 15000psi working pressure, material classes from AA through FF, product specification levels (PSL) from 1 through 3 and performance requirement (PR) 1~2.
Features
Simple structure and renewable gate and seat assembly.
One-piece and dual-acting gate with long service life.
Thrust bearing with large load capacity and com- posite rubber-plastic stem lip packing minimize operational torque.
Threaded packing gland allows removal of bear- ings and stem packing under pressure.
New type of closed groove seal ring installed between the valve body and bonnet, bolted connection is simple and reliable.
Bearing cap is provided with a grease cup to make it easy to inject lubricating grease in the field.
The sealing surfaces of the gate and seat are spray welding with special hard alloy for wear and corrosion resistance.
Wave springs are installed between the body and seat and between the gate and seat. The gate and seat still maintain a positive metal to metal seal under low pressure.
Floating gate design requests the hand wheel to be backed off 1/4 turn after its rotation can go no further.
