Welding valve welding, seal open, prevent welding welding slag when damage valve, sealing surface. Welding temperature is high, want to consider the bear ability of the material of the Industrial Valves temperature valves, all links in welding are open. Flange of the valve is connected under the normal temperature state, this time must be shut down seal, in order to avoid debris into the sealing face. Welding valve on both ends of connection work, heat, body, if it is not open, such as cooling down, may lead to seal a leak. Butt welding is: directly with a way of connecting pipe welding. Flange connection according to the joint surface shape can be divided into the following kinds: 1, the smooth type: used for low pressure valve. Processing more convenient, concave and convex type 2: high work pressure, can be used in hard washer 3, mortise type: plastic deformation is larger washers are available, and in the corrosive medium is used more widely, good sealing effect. 4, trapezoidal groove: with oval metal ring gasket, used to the work pressure of 64 kg/cm2 or valves, valve or high temperature. 5, lens type: the washer is lens shape, made of metal. For a working pressure of 100 kg/cm2 or high pressure valve, or high temperature valve. When the welding valve installation: ( 1) After the valve is in place, when the valve of preheating and welding. The valve should be placed in the fully open position, otherwise, in the process of welding. ball of ball valve and gate valve gate with welding slag, will be put into production in the attachment welding slag will scratch the seating, lead to valve leakage, serious will cause the failure of the valve. ( 2) must be supported or were supported on their base. ( 3) The valve after welding, such as the need to rotate the valve, manual note add grease grease gun includes processing should be adopted. ( 4) Confirm the drainage outlet, mouth closed. ( 5) - - - - - - Ball valve installation of omnidirectional, but should pay attention to the location of the operating side. Some directional ball valve when installation, must be in accordance with the arrow on the valve body logo to install, not the dress. West pipeline crude oil, refined oil, for example, the station of the part of the import and export side USES is two kinds of ball valve seat seal form, - End with double piston effect seat, and the other - To use since the drain sealing seat, if the reverse installation, after putting-in-service proactively will automatic pressure relief valve, pipeline accidents. requirements: (after welding 1) Before the valve pressure test after welding, should inject grease, to ensure that the valve] Full of grease between the sealing surface, which are attached to the valve seat sealing surface welding when impurities from grease. ( 2) Check Industrial Valves status, ensure all external joint lock, no loose; Confirm the outlet, discharge pressure in the locked state. To prepare for the test. ( 3) According to the scheme of pressure operating valve, the valve [ In the position of the rules. Accurate point, flange valve is connected under the normal temperature state, this time must be shut down seal, in order to avoid debris into the sealing face. Welding valve on both ends of connection work, heat, body, if it is not open, such as cooling down, may lead to seal a leak. Welding temperature is high, want to consider the bear ability of the material of valve temperature! And flange because when installation will not have an effect on the body, and water drive cannot install! ! ! ! So we need to close connection!
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