To choose a Check Valve, you must first master the performance of the medium, flow characteristics, as well as the performance of temperature, pressure, flow rate, flow rate, etc., and then, combined with factors such as process, operation, and safety, select the valve of the corresponding type, structure, and model specification. The valve is selected according to the flow characteristics. The shape of the valve opening and closing parts and the valve flow channel make the valve have certain flow characteristics.

This must be taken into account when selecting the valve, shutting off and connecting the valve for the medium. Valves that are easy to regulate flow are usually chosen. Such as regulating valve, throttle valve, plunger valve, because its valve seat size is proportional to the stroke of the opener. Rotary type (such as plug valve, ball valve, butterfly valve and flexible pinch valve, diaphragm valve, valve can also be used for throttling control, but usually only suitable for a limited range of valve size.

In most cases, people usually use changing The shape of the disc of the globe valve is used for throttling. It should be pointed out that it is extremely unreasonable to change the opening height of the gate valve or globe valve to achieve the throttling effect. Because the medium in the pipeline is in the throttled state, the flow rate is high, and the sealing effect is high. The surface is easy to be washed and worn, and the cutting and sealing effect will be lost. Similarly, it is unreasonable to use the throttle valve as the cutting device.

According to the needs of reversing and diverting, this valve can have two or more channels, which is suitable for the selection of plug valves and Ball valve. Most of the valves used for reversing and diverting are selected for this type of valve. In some cases, other types of valves, with two or more properly connected to each other, can also be used for reversing and diverting the medium. If the medium has suspended particles, it is most suitable to use a valve with a wiping effect, such as a flat gate valve, whose opening and closing member slides along the sealing surface.