More Installation Precautions: 1, the installation location, height, direction of import and export must meet the design requirements, pay attention to the direction of the flow of media should be consistent with the direction of the arrow marked body, the connection should be solid and tight. 2, the valve must be installed before the appearance of inspection, the valve nameplate should be consistent with existing national standards "General Valve Flags" GB 12220 requirements. For the working pressure is greater than 1.0MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with the requirements of GB 50243. 3, in the pipeline do not make the check valve withstand weight, a large check valve (aetv One-way valve): should be independent support, so that the impact of the pressure generated by the piping system. The key is: 1, the user is generally recommended to use metal seal on the wafer check valve to ensure that the wafer check valve has a higher life expectancy, higher temperature, and the same good sealing performance; 2, the nominal size is greater than or equal to DN100 (NPS4), to choose H76 double-flap swing check valve check valve is appropriate, can effectively reduce the check valve fluid resistance loss; nominal size less than or equal to DN80 (NPS3) H71-type lifting check valve is appropriate; 3, the nominal size of less than or equal to DN100 (NPS) H71-type lift-type wafer check valve due to compact structure, taking into account the manufacturing process, generally do not produce carbon steel check valve, it is recommended that users choose stainless steel lift-type folder check valve; 4, Lugs folder-type check valve has the following structure, if the user does not have special requirements, the general structure of the company according to the manufacture 5, some double valve swing check valve can be double flange design (H46 type); 6, Lug Clamp Double-lobed swing check valve lug flange only play a role in positioning, the lugs do not bear the bolt force, so the flange flange thickness is not designed according to the standard thickness of the flange, usually lug The flange thickness is less than the standard flange thickness. The double-flanged double-lobed swing check valve flange to bear the bolt force, the flange thickness according to the flange standard design; 7, the nominal pressure PN10, PN16, PN25 and PN40 lift the folder check valve has two structure length series. The use of a short series of check valves is less expensive, but non-standard connection pads may be required between the check valve and the pipe flange, and if using a long series of check valves, standard flange gaskets may be prepared ã€Print】 ã€Close】