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Material selection should consider the following factors for cryogenic valve

6/10/2012

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Material selection should consider the following factors for cryogenic valve:

1. The minimum allowable temperature of the cryogenic valve.

2. Metallic materials at low temperatures to maintain the mechanical properties of the working conditions, especially the impact toughness, relative elongation and organizational stability.

3. In case of low temperature and without oil lubrication, it should has a good abrasion resistance.

4. It should has good corrosion resistance.

5. If it is welded connections, we need to consider the welding performance of material.

6. How to select the material of valve body, valve cover, valve seats, valve disc.

7. Usually, we can generally choose ferritic steel when the temperature higher than -100°C for our normal material selection principles.

8. If the temperature is below -100°C, we can choose austenitic steel; for low pressure and small diameter valves, we can also used copper and aluminum materials. We should select the suitable material in accordance with the lowest working temperature.

9. For the stem and the fastener material, if the temperature higher than -100°C, it should be selected Ni, Cr-Mo alloy steel plus proper heat treatment to improve the tensile strength and to prevent the thread bites.

10. When the temperature is below -100°C, we should use the austenitic stainless acid-resistant steel. But the hardness of 18-8 acid-resistant steel is low, will cause the scratches between the stem and packing, so that it may leak. Therefore, the stem surface must be hard chrome plating (coating thickness 0.04-0.06mm), or nitride and nickel-phosphorus plating to improve the surface hardness.

11. To stop the nuts and bolts to be jammed, nuts generally use Mo steel or Ni steel, meanwhile to coat with molybdenum disulfide in the thread surface.

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How to inquire industrial valve?

12/9/2010

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The below table is a ball valve enquiry from our customer. It is a sample. And it is no need to inform full information, but please try to inform the working situation so that we can make the choice. And please pay attention as below:
Valve Size : Nominal size of the pipeline into which the valve will be placed must be determined.
Valve Material : The facts should be considered in determining the correct valve material, likely the medium, temperature range, pressure range, possible atmospheric conditions and extraordinary stresses, safety standards and or piping code etc.
Valve Type : What is the control function of the valve? Gate valve, globe valve, check valve, ball valve, butterfly valve, plug valve etc.
Pressure-Temperature Ratings : Please pay careful attention that the pressure-temperature ratings of a particular valve are in keeping with the requirements of the service. Also please pay attention to the packing and gasket materials as necessary to meet or exceed your service requirements.
Valve and Connections : Considerations as to pipeline integrity, future maintenance, corrosion factors, field assembly, weight and safety should be given in determining the method of connecting the valve in the pipeline.
Method of Operation : The means by which the valve is operated as supplied are shown for the valves in this catalog. Many optional operating devices are regularly supplied by us.
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ball valve enquiry
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    welcovalve@gmail.com
    China Valve Manufacturer

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