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Valve basic knowledge I - valve main parts materials

  • 2021-05-03 09:58

There are many materials for manufacturing valve parts, including various types of ferrous and non-ferrous metals and their alloys, and various non-metallic materials.

The materials for manufacturing valve parts should be selected according to the following factors:

1. The pressure, temperature and characteristics of the working medium.

2. The force of the part and its function in the valve structure.

3. It has better manufacturability.

4. If the above conditions are met, there must be a lower cost.

 

The first part of the material of the valve body, bonnet and disc (disc)

The valve body, bonnet and gate (disc) are one of the main parts of the valve, which directly bear the pressure of the medium, and the materials used must meet the requirements of "valve pressure and temperature rating". The commonly used materials are as follows:

1. Gray cast iron: Gray cast iron is suitable for water, steam, air, gas, oil and other media with a nominal pressure of PN≤1.0MPa and a temperature of -10degree-200degree. The commonly used grades of gray cast iron are: HT200, HT250, HT300, HT350.

2. Malleable cast iron: suitable for water, steam, air and oil media with a nominal pressure of PN≤2.5MPa and a temperature of -30-300degree. Commonly used grades are: KTH300-06, KTH330-08, KTH350-10.

3. Ductile iron: suitable for water, steam, air, oil and other media with PN≤4.0MPa and temperature of -30-350degree. Commonly used grades are: QT400-15, QT450-10, QT500-7.

    In view of the current domestic technological level, the various factories are uneven, and users are often not easy to inspect. Based on experience, it is recommended that PN≤2.5MPa, and the valve is still a steel valve for safety.

4. Acid-resistant high-silicon ductile iron: suitable for corrosive media with nominal pressure PN≤0.25MPa and temperature lower than 120degree.

5. Carbon steel: suitable for water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with a nominal pressure of PN≤32.0MPa and a temperature of -30-425degree. Commonly used grades are WC1, WCB, ZG25 and high-quality steel 20, 25, 30 and low-alloy structural steel 16Mn.

6. Copper alloy: suitable for water, sea water, oxygen, air, oil and other media with PN≤2.5MPa, and steam media with a temperature of -40-250degree. Commonly used grades are ZGnSn10Zn2 (tin bronze), H62, Hpb59-1 (Brass), QAZ19-2, QA19-4 (aluminum bronze).

7. High temperature copper: suitable for steam and petroleum products with nominal pressure PN≤17.0MPA and temperature≤570degree. Commonly used grades are ZGCr5Mo, 1Cr5M0. ZG20CrMoV, ZG15Gr1Mo1V, 12CrMoV, WC6, WC9 and other grades. The specific selection must be in accordance with the valve pressure and temperature specifications.

8. Low temperature steel, suitable for nominal pressure PN≤6.4Mpa, temperature ≥—196degree ethylene, propylene, liquid natural gas, liquid nitrogen and other media, commonly used grades) ZG1Cr18Ni9, 0Cr18Ni9, 1Cr18Ni9Ti, ZG0Cr18Ni9

9. Stainless acid-resistant steel, suitable for nitric acid, acetic acid and other media with nominal pressure PN≤6.4Mpa and temperature≤200degree. Commonly used grades are ZG0Cr18Ni9Ti, ZG0Cr18Ni10<nitric acid>, ZG0Cr18Ni12Mo2Ti, ZG1Cr18Ni12Mo2Ti<acid and urea> 

To be countinued.....

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