Stopcock how to install and repair?
Stopcock installation and maintenance: First, stopcock installation: 1, as long as the location allows, plug valves should be kept as close to the datum. 2. All working valves installed above ground level, operating platform or other easily accessible locations 2100 mm or more shall be capable of hammering to the pulley of their work. 3, hammer pulley should be fitted with U-type splint, but not J-type bolt splint. 4, the valve should be suitable for both vertical position installation, but also horizontal position installation. Second, the plug valve repair: all the use of welding operation and maintenance of the welding. 1, Welders and welding processes that meet ASME Section IX standards must be used. 2, all welding, including the maintenance of the weld should be low hydrogen welding process. 3, the welding repair should be carried out in accordance with the approved process, the main weld repairs are subject to the owner's consent. 4, plug valve on the welding of the repair should be completed before the production heat treatment. 5, welding repair or repair of the weld must be in the heat treatment before any metal stress to complete the process. 6, for the maintenance of castings need hardness test, because there will be across the weld, heat affected zone and the base material hardness of the micro-hardness shift. 7, the highest Vickers hardness value measured with a load of 500 grams shall be 310 HV. 8, For all repaired defects, the same NDE method originally used to detect defects should be adopted and tested according to the same standards. 9, before welding, the appropriate tools should be used to prepare the welding position to clean, remove dirt or metal debris. 10, for the depth of repair objects to achieve more than 20% of the thickness of the defect, shall not be repaired. More Keyword Search: Plug Valve
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