Specialized in Bellows Seal Globe Valve Manufacturer
Specialized in Bellows Seal Globe Valve Manufacturer
All the points where the leakage occurs can be detected by using different methods and instrumentation which a plant engineer need to note. The critical points where leakage occurs include the flanged gasket joints as well as the pump/valve gland packing, etc. Nowadays, most of the process industries are moving towards the use of safer technology so as to enhance the environmental protection and it has become a duty for the engineers to design plants which will helps in limiting the damage which occur in the environment by the prevention of leakage of oil, gases and other forms of toxic chemicals. The leakage from the stuffing box and valve glands is a major concern for the plant or maintenance engineer, this is because the leakage will result to atmospheric pollution, loss of materials and it is also dangerous for employees of the company. For instance, if there is a steam leaking through the valve gland, a space of 0.001″ via the gland will result to a rate of 25 lb/hour; this will result to a loss of about 1,100 per year. in addition to that, a tiny drop of 0.4mm diameter per second will result to a waste of about 200 liters per year of costly solvent, gas or oil.
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Through automatic seam welding, a metal barrier is formed between the fluid medium and the atmosphere to ensure zero leakage of the valve stem. The inside of the shut-off valve adopts a bellows structure, and the lower end of the stainless steel bellows is welded on the valve stem to prevent the process fluid from eroding the valve stem. The other end is placed between the valve body and the valve cover to form a static seal. Double seal design If the bellows fails, the stem packing will also avoid leakage. The bellows is welded to the valve stem to maintain stable running performance and avoid the valve stem vibration caused by the valve plug vibration. A variety of product designs, can provide non-return function, adjustment function, anti-impurity function, signal feedback function, extension rod function, hand wheel locking function.
The tube stop valve is a special bevel seal design that provides excellent sealing performance, so when the valve is closed, pressure must be applied to the valve flap. The double stuffing box provides absolute safety (according to the use of DIN 4754 heat transfer oil) to force the seal The face is guaranteed not to leak. At high temperatures, the stem does not come into contact with the media, ensuring reliable valve stem operation, lubricated threaded devices for continued stability in dirty or hot and cold environments, and fine thread design for precise and reliable rotation adjustment
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Depending on the form of movement of the flap, the change in the seat opening is proportional to the flap travel. The valve stem has a relatively short opening or closing stroke and a very reliable shut-off function. It is also suitable for the adjustment of the flow rate due to the change of the valve seat opening and the stroke of the valve flap. Therefore, the valve is well suited for use as a cut or adjustment and throttling.
A shut-off valve should be used on the pipeline or device of high temperature and high pressure medium. Such as thermal power plants, nuclear power plants, high-temperature, high-pressure pipelines of petrochemical systems. Pipes on the pipeline that do not require strict flow resistance. That is, the place where the pressure loss is not considered. Needle valves, instrument valves, sampling valves, pressure gauge valves, etc. are available for small valves. Flow regulation or pressure regulation, but the adjustment accuracy is not high
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The movement form of the valve stem of the globe valve has a lifting rod type (the valve stem is lifted and lowered, the hand wheel does not move up and down), and there is also a lifting and rotating rod type (the hand wheel and the valve stem rotate together and the nut is set on the valve body). The globe valve is only suitable for full opening and full closing, and adjustment and throttling are not allowed.
The globe valve is a forced-sealed valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface to leak. When the medium enters the valve six from below the valve flap, the resistance to be overcome by the operating force is the friction force of the valve stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve The diameter of the rod is large, otherwise the valve stem will be bent. In recent years, after the appearance of the self-sealing valve, the medium flow direction of the globe valve is changed into the valve chamber from above the valve flap. At this time, under the action of the medium pressure, the force of closing the valve is small, and the force of opening the valve is large, the valve stem is The diameter can be reduced accordingly. At the same time, this type of valve is also tight under the action of the medium. China's valve "three-way" has stipulated that the flow of the stop valve will be from top to bottom.
When the globe valve is opened, the opening height of the valve flap is 25% to 30% of the nominal diameter, and the flow rate has reached the maximum, indicating that the valve has reached the fully open position.
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Wuxing Industrial Zone,Oubei Town,Wenzhou City, Zhejiang Province,China
Tel:
+0086 577 67953777Email:
info@ngvalve.com
Phone:
+86 13588926667 Fax:
+0086 577 67966788