Step process method when the flange type electric ball valve adopts the wire cutting process When the flange type electric ball valve adopts the wire cutting process, the cutting process shall be suitable for the material to be cut, and there shall be no harmful defects such as cracks. Before cutting, material marks shall be transplanted to prevent mixing of materials.
When the carbon steel Q235 steel plate is no longer machined, the oxide skin, slag, splash, etc. on the cutting surface shall be removed, and the cutting surface shall be treated flat. The steel edges after mechanical punching and shearing shall be free of cracks, burrs and missing edges. When the ambient temperature of carbon steel is lower than - 20 ℃ and that of alloy steel is lower than O ℃, mechanical punching and shearing is not suitable. For the steel plate with cracks after wire cutting, heat treatment shall be carried out immediately after welding, or post heat treatment shall be carried out. The post weld heat treatment of Tianzhu flanged electric ball valve shall be carried out in accordance with DL/T 752, but the highest post weld heat treatment temperature shall be 20 ℃ - 30 ℃ lower than the lowest temperature of base metal and weld deposit metal on both sides.
Installation steps of flanged electric ball valve: 1. Loosen the middle gland nut to make the sealing ring almost inoperable, and then adjust the short pipe with the adjusted size of 1/2 Δ L is the best, then adjust the joint, remove the first nut of the stud, make the pipe go through the center, and make the head of the stud align with the pipe flange hole, then one end can be installed. 2. The nuts shall be pressurized symmetrically and tightened gradually. 3. Install the flange at the other end, and so on. 4. Compress the gland nuts symmetrically and gradually to fit. 5. When working, if it is found that the local sealing is not tight, the gland nut can be pressed locally until there is no leakage. If the sealing at both ends is not tight, gradually tighten the nuts at both ends of the flange until there is no leakage.