Structure classification
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
