Check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing back. It is also called check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

Check Valve: According to the structure, it can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and straight-through. Swing check valves are divided into three types: single valve, double valve and multi valve. The butterfly check valve is a butterfly double valve, a butterfly single valve, and the above types of check valves can be divided into four types in connection form: threaded connection, flange connection, welding and wafer connection.

Compilation method of check valve model: such as H41H-16C in order

Additional number of check valve: HH micro-resistance slow-closing check valve, BH heat preservation check valve, HQ rolling ball check valve;

Check valve type: H stands for check valve;

Check valve connection: 4 flanges, 6 welding, 7 pair clamps;

Check valve form: 1 lift type, 2 vertical type, 4 swing type, 6 double flap type, 8 butterfly type;

Check valve sealing: B babbitt alloy, F fluoroplastic, H stainless steel, M Monel alloy, X rubber, Y cemented carbide, W direct processing;

Check valve pressure: 16 pressure 16 kg, PN1.6-25mpa, pound class 150LB-2500LB, Japanese class 5K-63K;

Check valve material: Q ductile iron, C carbon steel, P-304, R-316, A titanium alloy, I chromium molybdenum steel;

Common models of check valves:

Wafer lift check valve: H71X, H71H;

Wafer butterfly double flap check valve: H76X, H76H;

Wafer disc check valve: H74H, H74I, H74M;

Silent check valve: H42H, H42W;

Micro-resistance slow-closing check valve: HH44H, HH46H, HH49H;

Rubber disc check valve: HC44X;

Muffler check valve: HC41H, HC41X, HC41T;

Lift check valve: H41H, H41W;

Swing check valve: H44H, H44W;

Slideway ball check valve: HQ41X;

Welding check valve: H61Y, H62Y, H64Y.