DJ41Y Low Temperature Stop Valve
Low-temperature shut-off valveIt is an essential spare part for low-temperature valves used in pipelines for transporting low-temperature or ultra-low temperature media. Its function isConnect or disconnect the pipeline mediumSimple structure, easy manufacturing and maintenance; When the valve is opened and closed, the valve stem moves in a straight line along the axis, and there is almost no friction between the sealing surfaces. And the opening and closing stroke is short, which can meet the long-term working ability of the surrounding environment temperature from -29 ℃ to -196 ℃.
This product has the following main featuresStructural features:
1. The valve disc is guided throughout its entire range of travel, which can meet the sealing requirements of valves in different installation directions (inclined installation or horizontal installation).
2. The valve cover shall be lengthened and welded with baffles/drip plates in accordance with Shell's "Valve Specification Requirements for Low Temperature Media" to ensure that the packing is always at a temperature above zero under different low temperature conditions, and to ensure that the valve stem is not damaged when moving at the packing.
The small diameter space between the valve stem and the extended valve cover reduces heat transfer losses.
4. Place the upper seal on top of the extended valve cover to ensure that the upper sealing surface will not be damaged under low temperature conditions. At the same time, a valve stem guide sleeve is installed at the bottom of the extended valve cover to ensure smooth up and down movement of the valve stem.
5. The surface of the valve stem has been inspectedHardening treatmentAnd the surface roughness Ru value in contact with the filler is less than 0.4 μ m.
6. Used for low-temperature valves at -100 ℃, usingaustenitic stainless steel The valve body, valve cover, valve disc, valve seat, valve stem and other parts are all processed before precision machiningAt least 2 deep cryogenic treatments.
7. On the sealing surface of the valve disc and seatHard alloy overlay weldingThe thickness of the weld overlay is greater than 1.6 millimeters after processing. When the temperature is below -100 ℃, welding has been carried out after weldingcryogenic treatment.
Performance parameters:
Low temperature globe valves are widely used in pipeline systems in various fields such as petroleum, chemical, power, thermal, mining, metallurgy, medicine, food, gas, fertilizer, saline alkali, chemical fiber, taxation, environmental protection, industrial and civil construction, and nuclear industry; And liquefied natural gas, liquefied petroleum gas, and other low-temperature industries. It can be said that low-temperature shut-off valves have become an important component with significant demand in the low-temperature industry.
In the field of low temperature,XintaivalveGroup Limited CompanyWe have a continuous independent innovation technology research and development team, established a scientifically sound technology research and development system and low-temperature testing laboratory, which enables our company's products to maintain a leading position in process technology for a long time. At present, Xintai Group's low-temperature series products mainly include low-temperature ball valves, low-temperature globe valves, low-temperature gate valves, low-temperature check valve series, etc.
