Where the check valve is suitable?

The purpose of using a check valve is to prevent the reverse flow of the medium, and a check valve is generally installed at the outlet of the pump. In addition, a check valve should be installed at the outlet of the compressor. In short, in order to prevent the reverse flow of the medium, check valves should be installed on the equipment, devices or pipelines.

Generally, vertical lift check valves are used on horizontal pipelines with a nominal diameter of 50mm. The straight-through lift check valve can be installed on both horizontal and vertical pipelines. The bottom valve is generally only installed on the vertical pipeline of the pump inlet, and the medium flows from bottom to top.

The swing check valve can be made into a very high working pressure, the PN can reach 42MPa, and the DN can also be made very large, the maximum can reach more than 2000mm. Depending on the material of the shell and the seal, it can be applied to any working medium and any working temperature range. The medium is water, steam, gas, corrosive medium, oil, food, medicine, etc. The medium working temperature range is between -196~800℃.

The installation position of the swing check valve is not limited, and it is usually installed on a horizontal pipeline, but it can also be installed on a vertical pipeline or an inclined pipeline.

The applicable occasion of butterfly check valve is low pressure and large diameter, and the installation occasion is limited. Because the working pressure of the butterfly check valve cannot be very high, but the nominal diameter can be very large, which can reach more than 2000mm, but the nominal pressure is all below 6.4MPa. The butterfly check valve can be made into a wafer type, which is generally installed between the two flanges of the pipeline in the form of a wafer connection.

The installation position of the butterfly check valve is not limited, and it can be installed on horizontal pipelines, vertical pipelines or inclined pipelines.

Diaphragm check valves are suitable for pipelines that are prone to water hammer, and the diaphragm can well eliminate the water hammer caused by the reverse flow of the medium. Because the operating temperature and operating pressure of the diaphragm check valve are limited by the diaphragm material, it is generally used on low-pressure and normal temperature pipelines, especially suitable for tap water pipelines. Generally, the working temperature of the medium is between -20~120°C, and the working pressure is <1.6MPa, but the diaphragm check valve can be made with a larger diameter, and the maximum DN can reach more than 2000mm.

Due to its excellent anti-shock performance, relatively simple structure, and low manufacturing cost, the diaphragm check valve has been widely used in recent years.

Because the seal is a rubber-coated sphere, the ball check valve has good sealing performance, reliable operation, and good water hammer resistance; and because the seal can be a single ball or multiple balls, it can be made into a large diameter . But its seal is a hollow sphere covered with rubber, which is not suitable for high-pressure pipelines, but only for medium and low-pressure pipelines.

Since the shell material of the ball check valve can be made of stainless steel, and the hollow sphere of the seal can be covered with polytetrafluoroethylene engineering plastics, it can also be applied to pipelines of general corrosive media.

The working temperature of this type of check valve is between -101~150℃, its nominal pressure is ≤4.0MPa, and the nominal diameter range is between 200~1200mm.

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