The check valve may also be used in the line to supply auxiliary systems where the pressure may rise above the system pressure.Check valve can be divided into swing check valve (rotating according to the center of gravity) and lift check valve (moving along the axis).
Divided by structure, it can be divided into lifting check valve, swing check valve and butterfly check valve three kinds:
1. Lifting check valves are divided into vertical and horizontal types.
2. Swing check valves are divided into single valve type, double valve type and multi-valve type.
3. Butterfly check valve is straight through.
The above kinds of check valves can be divided into four types in connection form: threaded connection, flange connection, welding connection and clamp connection"
"The material classification
1. Cast iron check valve
2. Brass check valve
3. Stainless steel check valve
4. Carbon steel check valve
5. Forged steel check valve"
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