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Valve three different connections introduced
There are three main types of valve connection, welding connection, screw connection, flange connection, the article describes the three valve connections are described in detail, as follows: Welded connection valve in the larger nominal diameter, the conditions of load moment, the temperature Higher occasions, the body often use groove on the welding, at the same time, butt welding seam with the original requirements, must use skilled welding workers to complete this work. Welded valves with nominal diameters up to 50 mm usually have weld sockets to receive the pipe at the load plane end. As the socket welding and sockets in the formation of gaps between the pipe, which may make the gap by some media corrosion, and pipeline vibration will fatigue joints, so the use of socket welding is subject to certain restrictions. Weld connection for a variety of pressure and temperature, more load in the conditions of use, more reliable than the flange connection. But the welded connection of the valve removal and reinstallation are more difficult, so its use is limited to usually long-term and reliable operation, or conditions of load moment, the temperature is high occasions. Such as thermal power stations, nuclear power projects, ethylene projects on the pipeline. Threaded valve threaded connection of the valve is mainly nominal pass through the valve below 50mm. If the path size is too large, the connection part of the installation and sealing is very difficult. Threaded connections are typically made by machining the inlet and outlet ends of a valve into a conical pipe or a straight pipe thread that allows it to be connected to a tapered pipe nipple or pipe. Since such a connection may present a larger leak channel, these channels can be plugged with sealants, sealing tapes, or fillers. If the material of the valve body is weldable but the coefficient of expansion varies widely or the range of variation in operating temperature is large, the threaded connections must be nectar welded. In order to facilitate the installation and removal of threaded valves, pipe fittings are available in place on the piping system. Nominal diameter of 50mm below the valve can use the pipe joints as a pipe joint, pipe joints thread connecting the two parts together. Flange connection valve Flange connection valve, the installation and removal are more convenient, but the flange connection than the threaded valve bulky, the corresponding price is high, so it is suitable for a variety of diameter and pressure pipe connections. When the temperature exceeds 350 degrees, due to a loose bolt, gasket and flange, but also significantly reduce the load on the bolt, the flange may have a strong force leaks.