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Plug valve and gate valve comparison
Valve lift wedge plug, the switch always friction, to ensure easy operation of the valve? Zero leakage and long life. 1? Stem wedge plug valve lift, the switch always friction, to ensure easy operation of the valve? Zero leakage and long life. When the valve is opened, the valve plug first moves upward to disengage from the valve seat and then frictionlessly rotates by 90 ° until the valve opens. When the valve is closed, the valve plug is rotated 90 ° without friction and then squeezed to the valve seat to close completely. During valve opening and closing, there is always no friction between the valve plug and the valve seat. 2? Double shut-off and automatic check valve sealing device (DBB function, with ABV automatic discharge system). 3? End caps at the top and bottom for quick on-line maintenance and repair; just remove the bottom end cap by simply closing the valve with medium in the pipeline to quickly remove sand, Particle removal, while facilitating the maintenance of the valve and seal replacement. Disadvantages of the gate valve: 1. The gate always has friction in the opening and closing process, so the operating torque is large, and scratches easily occur on the sealing surface of the gate and the valve seat, resulting in the leakage of the valve; 2. No self-checking leakage device, (Even if a small valve is installed through two gate valves to achieve this function, automatic detection function can not be realized.) 3. For media with particle impurities such as sand deposited on the bottom of the valve, the gate can not be fully closed, resulting in Valve leakage is very serious, (this point valve is a fatal disadvantage).