(1) thread connection valve. This connection is usually the end of the valve and out of cones processed into pipes or straight pipe thread, so that it can be connected to the cone tube or pipe nipple on the road. As a result of this connection may leak a larger channel, it can be used sealants, sealing or packing tape to plug the channel. If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
Valve thread Nominal mainly by valves in the 50mm below. Path size, if too large, the junction is very difficult to install and seal. In order to facilitate the installation and removal of the valve connecting thread in the pipeline system can be used at appropriate locations on the pipe connection. DN 50mm below the valve can be used as a socket pipe fittings, pipe thread socket will connect the two parts together.
(2) flanged connection valves. Valve flange connection, the installation and removal are more convenient. But the thread of the valve than the heavy, the corresponding prices are highest. Therefore, it applies to all kinds of pressure path and the pipe connection. However, when the temperature over 350 degrees, as bolts, gaskets and flange of a change to relax, but also significantly reduces the load bolts, a lot of stress on the flange connection may have a leak.
(3) welding to connect the valve. This connection applies to all kinds of pressure and temperature, in a moment under the condition of the Netherlands use more reliable than the flange connection. However, welding to connect the valve and re-installation of the demolition are more difficult, so its use is usually limited to long-term reliable operation, or use of the conditions of Dutch engraved, high temperature occasion. Such as thermal power stations, nuclear power engineering, the ethylene project pipeline. DN 50mm below the welding socket weld valves generally have a flat side to take charge of the pipeline. As the jack socket and pipe welding in the formation of the gap between, there may be some crevice corrosion medium, the vibration at the same time pipeline will connect the site of fatigue, so the use of socket welding subject to certain restrictions. Larger in nominal diameter, engraved with the use of the conditions of the Netherlands, the higher the temperature of the occasion, often the use of body welding groove on at the same time, to have the original lattice seam welding requirements, choice of technology must be perfect to complete the work of welders. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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