valve, check valve is a kind of automatic control valves, is also a one-way valve, a liquid can flow from one side to another side. Clamp check valves have various types, when the choice should be mainly based on liquid environment to determine. If choose undeserved, the valve may not be able to work properly. When choosing clamping check valve, clamping check valves must be have a profound understanding of, so as to make better use of clamp check valve. For clamping the check valve, commonly used in cleaning media, but should not be used for solid particles and high viscosity medium. We usually choose low pressure check valve, the clamping check valve are butterfly, vertical, the check valve diaphragm type, these can be very good isolation medium. For DN is greater than 200 mm, less than 1200 mm of medium and low pressure check valve, should choose not to wear ball valve, choose the DN is greater than 50 mm, less than 2000 mm of low pressure check valve. We should choose the right to check. When choosing clamp check, should be mainly used on this. Clamping, for example, the check valve is mainly suitable for water hammer pipe, clamping check valve well eliminate reverse flow caused by water hammer, the media to apply or pressure has certain limitations. In general, clamping the check valve is suitable for the low pressure pipeline, at room temperature. If you choose to clamp check, when you require close water hammer impact is relatively small or no water hammer pipe, can choose butterfly check valve, we can find that all sorts of check valves are well separated medium or control flow. When installing a clamping check valve, medicine card position, height and direction should comply with the standards of imports and exports, the main solution is to the body is consistent with the direction arrow mark, especially when connected. From clamping check and cutting effect in the main standards and working pressure on the valve to check valve, strength and sealing performance test before installation, only after the qualified can use. In strength test, the test pressure is 1 of the nominal pressure. 5 times, duration of not less than 5 min. Valve housing and packing should be qualified and no leakage. In leakage test, the test pressure is 1 of the nominal pressure. 1 times, the test time in line with the requirements of GB 50243. In strength test, the test pressure is 1 of the nominal pressure. 5 times, duration of not less than 5 min. Valve housing and packing should be qualified and no leakage. In leakage test, the test pressure is 1 of the nominal pressure. 1 times the test pressure in the test process should comply with the requirements of GB 50243, qualified valve sealing surface, no leakage.

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