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Commonly used valves are gate valves, globe valves, butterfly valves, ball valves, check valves, etc.

Gate valve

Gate valve sealing performance, fluid resistance is small, opening and closing labor-saving, with a certain degree of regulatory performance, is one of the most commonly used cut-off valve. The disadvantage is that the size is large, the structure is more complex than the globe valve, the sealing surface is easy to wear, not easy to repair, generally should not be used for throttling.

Shut-off valve

Globe valve is a downward closing valve, the opening and closing member (valve flap) is driven by the valve stem along the seat (sealing surface) axis for lifting movement of the valve. Globe valves have good adjustment performance, simple structure, and high fluid resistance, and are generally used for medium and small diameter pipelines.

Ball valve

The opening and closing parts of ball valves are spheres with round holes, and the spheres rotate with the valve stem to open and close the valve. The ball valve has a simple structure, rapid switching, easy operation, small size, light weight, low fluid resistance, and good sealing.

Butterfly Valve

Butterfly valve is a butterfly plate in the valve body around the fixed axis rotation of 90 ° to complete the opening and closing role. The butterfly valve is small in size, light in weight, simple in structure, composed of only a few parts, and simple in operation. When the butterfly valve is in fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop through the valve is very small, so it has good flow control characteristics.

Check valve

Check valve is a valve that can automatically stop the backflow of fluid. The valve flap of the check valve opens under the action of fluid pressure and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the flap automatically closes under the action of fluid pressure difference and its own gravity to prevent the backflow of fluid.