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Difference between Gate Valve and Shut-off Valve

With the rapid development of science and technology, types of valves are more and more, check valves, gate valves, butterfly valves and ball valves are common, let us understand the difference between shut-off valve and gate valve.
1. Their operating principles are different
Shut valve belongs to rising stem type, when the valve is closed, valve flap is applied pressure, provides tight fitting seat sealing surface to force the seal does not leak. Opening and closing pieces of gate valve are damper, when the valve is closed, the sealing surface can rely on media pressure to achieve "self-sealing."
2. Their advantages and disadvantages are different
Shut off valve is simpler than gate valve on structure, therefore, in the installation and maintenance more convenient. the sealing surface of shut off valve to be easily damaged, but the opening and closing are laborious, adjusting performance is poor, and the liquid resistance is large. flow resistance of the gate valve is small, so opening and closing are effort, its sealing surface easy eroded, the less convenient to repair.
3.Installation of shut-off valve and flow valve are different
When the shut off valve is installed, medium enters are directional. But for the gate valve, the medium can flow in both directions. 

Gate Valve

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