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Check valve classification and corresponding description


One-way valve: The check valve, also known as a one-way valve or a check valve, is used to prevent the backflow of the medium in the pipeline. The bottom valve of the water pump suction valve also belongs to the check valve category.

NRVG silent check valve

Check Valve: It is a valve that can actively prevent the backflow of fluid. The disc 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 valve disc is automatically closed under the action of fluid pressure difference, self-gravity and other factors to prevent fluid backflow

Check Valve: It is generally divided into several types such as lift type, swing type, butterfly type and diaphragm type.

The structure of the lift check valve is generally similar to that of the globe valve. The valve disc moves up and down along the line in the channel, and the action is reliable, but the fluid resistance is large, and it is suitable for light and small diameter occasions. There are two types of lift check valve, longitudinal type and vertical type. Longitudinal lift check valves can usually only be installed in horizontal pipelines, while vertical lift check valves are usually installed in vertical pipelines.

The disc of the swing check valve rotates around the axis of rotation. Its fluid resistance is generally smaller than that of the lift check valve, and it is suitable for larger diameter occasions. According to the number of discs, swing check valve can be divided into three types: single disc swing type, double disc swing type and multi disc swing type. Single flap swing check valve is generally suitable for medium diameter occasions. When using a single flap swing check valve for large-diameter pipelines, in order to reduce the water hammer pressure, it is better to use a slow-closing check valve that can reduce the water hammer pressure. Double flap swing check valve is suitable for large and medium diameter pipelines. Wafer double flap swing check valve has a small structure and light weight, and is a kind of check valve with rapid development; multi flap swing check valve is suitable for large diameter pipelines.

The structure of the butterfly check valve is similar to that of a butterfly valve. Its structure is simple, the flow resistance is small, and the water hammer pressure is also small.

Diaphragm check valves have various structural forms, all of which use diaphragms as opening and closing parts. Because of their good waterproof hammer performance, simple structure and low cost, they have developed rapidly in recent years. However, the operating temperature and pressure of the diaphragm check valve are limited by the diaphragm material.

DDCV double flap check valve

Check Valve: Standard swing check valve Flue check valve Tubular check valve Wafer check valve

Slow-closing check valveVertical check valveSilent check valveCheck valve priceMicro-resistance slow-closing check valve

H76 type wafer type double disc swing check valve has low water hammer pressure, short valve disc stroke, and has spring-assisted closing and fast valve closing speed

H44 type flange single flap swing check valve is very large, the valve flap travel is long, and a long closing time is required

The water hammer pressure of type H76 is only 1/2~1/5 of that of type H44

Ball type sewage check valve: The valve body adopts a full channel structure, which has the advantages of large flow and low resistance.The ball is used as the valve disc, which is suitable for industrial and domestic sewage pipe networks with high viscosity and suspended solids.

Return valve: One-way valve: also known as one-way valve or check valve, its function is to prevent the backflow of the medium in the pipeline. The bottom valve of the water pump suction valve also belongs to the check valve category.

The valve that opens or closes by itself by the flow and force of the medium to prevent the backflow of the medium is called a check valve. The check valve belongs to the active valve category, and is mainly used in the pipeline where the medium flows in one direction, and only allows the medium to flow in one direction to prevent accidents.


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