Large-diameter gate what is the purpose and the requirements of the installation

Large-diameter gate what is the purpose and the installation requirements. Use of large diameter valve is suitable for Class150 ~ 2500, the working temperature - 29～425℃（ Carbon steel) Or - 29～500℃（ Stainless steel) Small diameter pipeline for truncated or on line in the medium, choose different material, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media. In the path of the oil pipeline more application. 2. Points 1 installation, installation location, altitude, direction must comply with the design requirements of imports and exports, connection should be firmly connected. 2, all kinds of manual valves installed on the thermal insulation pipe, handle shall not down. 3, a visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards 'universal signal valve' GB 12220. For the working pressure is greater than 1. 0 MPa and the valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure for the nominal pressure of 1. 5 times, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Leak test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test pressure in the test should comply with the standard of GB 50243 requirements, qualified for damper seal face no leakage.