1. The valve stem lift type wedge plug valve has no friction at all times, ensuring easy operation, zero leakage and long life. When the valve is opened, the spool moves upwards out of the seat and then rotates 90° without friction until the valve opens. When the valve is closed, the spool rotates 90° without friction and then squeezes into the seat until it is completely closed. There is always no friction between the valve plug and the seat during the opening and closing of the valve. 2, double shut-off and automatic check valve sealing device (DBB function, with ABV automatic venting system). 3, the top and bottom have end caps, which can be quickly maintained and repaired online; In the case of medium in the pipeline, the bottom end cap can be removed by simply closing the valve, which can quickly remove hard particles such as sand and welding slag, and facilitate the maintenance of the valve and the replacement of the seal. Disadvantages of the gate valve: 1. There is always friction in the opening and closing process of the gate, so the operating torque is large, and scratches are easily generated on the sealing surfaces of the gate and the valve seat, causing the valve to leak; 2. There is no self-test leakage device. (Even if this function is achieved by installing a small valve through two gate valves, the automatic detection function cannot be realized); 3. For media containing particulate impurities, such as sand, deposited on the bottom of the valve, the gate cannot be completely closed, causing the valve to leak very seriously (this is a fatal disadvantage for gate valves). Kitchen Faucet,Kitchen Sink Faucets,Kitchen Water Faucet,Kitchen Faucet With Sprayer AIHUI Sanitary Ware , https://www.fsaihuisanitary.com