There are nine commonly used materials for valve bodies：

• 1. Gray cast iron, suitable for working temperature between 15 ~ + 200 ℃, nominal pressure 1.6 Mpa or less low-pressure valve;
• 2. Malleable cast iron is suitable for the working temperature between 15 ~ + 250 ℃, nominal pressure 2.5 Mpa or less in the low-pressure valve;
• 3. Nodular cast iron, suitable for working temperature between 30 ~ + 350 ℃, nominal pressure 4.0 MPa or less in the low-pressure valve;
• 4. Carbon steel (WCA, WCB, WCC), suitable for working temperature in between – 29 ~ + 425 ℃, and high-pressure valves, including 16 Mn, 30Mn working temperature between 40 ~ + 450 ℃, commonly used to replace ASTM A105;
• 5. Low carbon steel (LCB), suitable for working temperature between – 46 ~ + 345 ℃ cryogenic valves;
• 6. Alloy steel (WC6, WC9), suitable for working temperature between – 29 ~ + 595 ℃ of the corrosive medium of high temperature and high-pressure valve; WC5, WC12 is suitable for the work in between – 29 ~ + 650 ℃ temperature corrosive medium of high temperature and high-pressure valve;
• 7. Austenitic stainless steel, suitable for working temperature in corrosion medium – 196 ~ + 600 ℃ between valves;
• 8. Monel alloy, mainly used in valves containing hydrofluorine;
• 9. Cast copper alloys, mainly are suitable for the working temperature between 273 ~ + 200 ℃ of oxygen pipe with a valve.

The listed above is the valve body commonly used materials in a large class, specific in each class of materials, and there are many different brands, a variety of different brands and applicable to a variety of different pressure levels. Therefore, in the choice of valve body material, should be based on different purposes and different pressure levels, determine suitability for the working condition of the valve body material.

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1. All valves of flange forged steel ball valve are designed as a whole

There is a mounting flange on the top of the valve body, conforming to the International Organization for Standardization standard ISO5211, for direct installation of actuators, limit switches, anti-leakage detection warning devices or extended handles.

The resilient seat design is leak-free under high and low pressure conditions and reduces wear and torque to operate the valve. More materials for customers to choose. Standard seat materials are virgin PTFE, glass-filled or carbon-filled PTFE.

Precision polished, durable forged steel ball valve features a pressure relief hole in its stem groove to equalize pressure in the valve cavity, ensuring tight valve closure and extending valve life.

2. The material of the valve body and valve trim of the flanged forged steel ball valve

The standard body material is 316 stainless steel and WCB, LCB type carbon steel. The ball and stem in the trim are 316 stainless steel. The valve stem has a built-in anti-static device, which ensures continuous contact between the valve stem and the valve body, the valve stem and the valve ball and forms a discharge circuit. The surface of the carbon steel valve is phosphating. And the surface of the stainless steel valve does not need to be treated.

3. All fire protection valves of flanged forged steel ball valves are equipped with flexible graphite body and graphite stem seals

The valve seat is an elastic material. In the event of a fire, an auxiliary machined metal ring will come into contact with the valve ball, preventing leakage.

Once the stem seal burns off, a machined, curved metal surface on the stem itself will act as a secondary sealing surface to prevent leakage. Valves are designed and manufactured in accordance with the relevant standards for use in special application conditions, and are suitable for use in various special media, such as dry chlorine, oxygen, hydrogen peroxide, ammonia, vacuum, steam, heat medium and low temperature conditions.

We will give the specifications of the forged steel ball valve and the control of the type of seat, operating temperature, medium and operating frequency at different pressures. For each seat material and actuator air pressure, room temperature water was used. Under different pressure drops, the valve torque test is carried out, and according to the test results, the torque value of the valve is calculated.

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