The stainless steel globe valve belongs to the forced seal type valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface not to leak. From the emergence of self-sealing valves, stainless steel globe valve media flow direction is changed from the top of the valve flap into the valve cavity, then under the action of media pressure, the force to close the valve is small, while the force to open the valve is large, the diameter of the valve stem can be reduced accordingly.
Here is the content list:
How to operate the globe valve
The selection principle of globe valve
How to operate the globe valve?
To open and close the stainless steel globe valve, the force should be smooth and not impact. Some impact opening and closing of high-pressure globe valve components have taken into account that this impact force and general globe valve can not be equivalent. When the shut-off valve is fully open, the handwheel should be reversed a little, so that the thread between the tight, so as not to loosen the damage. When the pipeline is first used, more internal dirt, you can slightly open the shut-off valve, the use of the high-speed flow of media will be washed away, and then gently close, open again, so repeat many times, flush clean dirt, and then put into normal operation. Normally open stainless steel globe valve, the sealing surface may be sticky with dirt, close also to use the above method to flush it clean, and then formally close the tight.
The selection principle of globe valve
1. High temperature, high-pressure media pipeline or device on the appropriate choice of stainless steel globe valve. Such as thermal power plants, nuclear power plants, petrochemical systems, high-temperature, high-pressure pipelines.
2. Usually used in the pipeline on the flow resistance requirements are not the strict pipeline. That is, where the pressure loss is not considered.
3. A wide selection of small valves.
4. There is flow regulation or pressure regulation, but the requirements for regulation accuracy are not high, and the diameter of the pipeline is relatively small, such as nominal through the ≤ 50mm of the pipeline, which should be used.
5. Alumina Bayer production in the desilicon workshop, easy to coking pipeline, easy to choose the valve body separate type, the seat can go at the carbide sealing vice of the DC type globe valve or DC type globe valve.
6. Urban construction of water supply, heating engineering, nominal through the smaller pipeline, stainless steel globe valve can be used, such as nominal through the pipeline less than 150mm.
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