Plug Valves All weld repairs and weld repairs must use welders and welds that meet ASME Section IX standards. All welding, including repairs to the weld, should be performed using a low hydrogen welding process. Welding repairs should be carried out in accordance with an approved process, and repairs to the main welds are subject to the owner's consent. The repair of the casting of the plug valve by the plug valve should be completed before the production heat treatment. Welding repairs or repairs to the weld must be completed prior to any heat treatment process that eliminates metal stress. Hardness testing is required for repairs on castings because of the small hardness traverse across the weld, heat affected zone, and parent metal. The Zui high Vickers hardness value measured with a load of 500 grams should be 310 HV. For all repaired defects, the same NDE method originally used to detect defects should be used and tested according to the same standard. Prior to welding, the location where the weld is to be prepared should be cleaned with a suitable tool to remove dirt or metal debris. For defects whose depth reaches 20% or more of the thickness of the object to be repaired, no repair is allowed. Plug valve installation The plug valve should be kept as close to the reference as far as possible. All working valves installed above the ground, operating platform or other accessible location 2100 mm or higher should be capable of hammering the pulleys that they work with. The hammer pulley should be equipped with a U-type splint, not a J-type bolt splint. The valve should be suitable for both vertical and horizontal installations.
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