Introduction of valve shell materials

Valve is the most commonly used material to control liquid at present, and it is actually the control part of fluid conveying system. The valve has good cut-off performance, the function of regulating liquid and the strong diversion function. Therefore, valves play a very important role in liquid transportation and gas transportation. In addition, the valve also has very good anti-corrosion and waterproof performance. However, many friends are not familiar with the appearance of the valve, so Bian Xiao will tell you something about the valve, hoping to help you.

Valve housing material

1. gray cast iron: gray cast iron is suitable for water, steam, air, gas, oil and other media with nominal pressure PN≤ 1.0MPa and temperature-10℃ ~ 200℃. Commonly used brands of gray cast iron are: HT200, HT250, HT300 and HT350.

2. Malleable cast iron: suitable for water, steam, air and oil media with nominal pressure PN≤2.5MPa and temperature of -30 ~ 300℃. Commonly used brands 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 ~ 350℃. Commonly used brands are: QT400- 15, QT450- 10 and QT500-7.

In view of the current domestic technical level and uneven factories, it is often difficult for users to test. According to experience, it is suggested that PN≤2.5MPa and the valve material should be steel.

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

5. Carbon steel: suitable for water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with nominal pressure PN≤32.0MPa and temperature of -30 ~ 425℃. Commonly used brands are WC 1, WCB, ZG25? And high-quality steel 20, 25 and 30 and low-alloy structural steel 16Mn.

Six, copper alloy: suitable for PN≤2.5MPa? Water, seawater, oxygen, air, oil and other media, as well as steam media with the temperature of -40 ~ 250℃, are commonly used, such as ZGnSn 10Zn2 (tin bronze), H62, Hpb59- 1 (brass) and QA 19-2.

7. High temperature copper: suitable for steam and petroleum products with nominal pressure PN≤ 17.0MPA and temperature ≤570℃. Commonly used brands are ZGCr5Mo, 1Cr5Mo, ZG20CrMoV,? ZG 15Gr 1Mo 1V，？ 12CrMoV？ ,? WC6，？ WC9 and other brands. The specific selection must comply with the provisions of the valve pressure and temperature specification.

Eight, low temperature steel, suitable for the nominal pressure PN≤6.4Mpa, temperature ≥- 196℃ and other media, the common brands are ZG 1Cr 18Ni9? 、0Cr 18Ni9、 1Cr 18Ni9Ti？ 、ZG0Cr 18Ni9 .

Nine, stainless acid-resistant steel, suitable for the nominal pressure PN≤6.4Mpa or less? , temperature ≤200℃ nitric acid, acetic acid and other media, commonly used brands are ZG0Cr 18Ni9Ti? , ZG0Cr 18Ni 10 (nitric acid resistance)? ,? ZG0Cr 18Ni 12Mo2Ti？ ZG1Cr18ni12mo2ti (acid and urea resistant).

The material of valve housing is very special, but it has no good environmental protection performance. There are also many valve housing materials. For example, the most common valves are Cr-Mo steel valves, Cr-Mo-V steel valves, dual-phase steel valves, plastic valves, non-standard customized valves and so on. According to the function, it can be divided into pneumatic hydraulic valve and manual valve. However, no matter what kind of gate valve, the characteristics of fire prevention, waterproof and wear resistance are very good, and the appearance is also very atmospheric. Therefore, everyone must be careful when purchasing valves, otherwise it is easy to damage the valves.

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