(1) thread connection valve. This connection is usually processed ends of the valve and out into the cone tube or straight pipe thread which allows it to connect to the tapered pipe thread joint or possession of the road. Because of this connection may have been a leak channel, it can be used sealants, sealing tape or filler to plug the channel. If the valve body material can be welded, but the very different expansion coefficients, or the rate of temperature change in the scope of a larger thread junction honey must be welded.
Thread connecting the valve is mainly Nominal been in 50mm below the valve. If the diameter size is too large, the Ministry of the installation and sealing connection very difficult.
For ease of installation and removal of threaded connection of valves in the piping system, the appropriate position is available fittings. Nominal diameter 50mm below the valve in the tube section can be used as pipe joints, pipe thread socket will connect the two parts together.
(2) The flange valve. Flange valve, its installation and removal are more convenient. However, bulky than the thread to connect the valve, the corresponding prices higher value. Therefore, it applies to a variety of diameter and pressure pipe connection. However, when the temperature over 350 degrees, due to bolts, gaskets and flange a variable relaxation, but also significantly reduce the load on bolts on the flange force likely to produce significant leakage.
(3) Welding connection valve. This connection applies to all kinds of pressure and temperature, in the more Dutch engraved under the conditions of use, more reliable than the flange connection. However, the valve welded connections dismantling and re-install it rather difficult, so its use is usually limited to long-term reliable operation, or use Dutch engraving, higher temperatures occasions. Such as thermal power stations, nuclear power engineering, the ethylene project pipeline.
Nominal diameter in 50mm below the welding socket weld valves usually have to take over Dutch side of the channel plane. As in the socket and the pipe socket weld formed between the cracks, and thus has the potential to crevice corrosion by certain media, while the vibration of pipeline will connect parts of fatigue, so the use of socket welding subject to certain restrictions.
In the nominal diameter greater use Dutch engraving, high temperature of the occasion, valve often used for welding groove, while the original mesh welding seam has to be sought for selection of technically proficient welders to complete this work. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
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