Function of ball valve
The ball valve evolved from the plug valve. Its opening and closing part is a sphere, which is used to rotate 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing.
The ball valve is mainly used to cut off, distribute and change the flow direction of the medium on the pipeline. The ball valve designed with a V-shaped opening also has a good flow regulation function.
The ball valve can be integral or combined. The main features of the ball valve are compact structure, reliable sealing, simple structure, convenient maintenance, the sealing surface and the spherical surface are often in a closed state, not easy to be eroded by the medium, easy to operate and maintain, suitable for general working media such as water, solvents, acids and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc., and are widely used in various industries. Especially in industrially developed countries, ball valves are widely used, and the variety and quantity of use are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent regulation performance and one valve with multiple functions. Its reliability and other performance indicators have reached a high level, and it has partially replaced gate valves, stop valves, and regulating valves.
With the technological advancement of ball valves, they will be more widely used in oil and gas pipelines, oil refining cracking units and the nuclear industry in the foreseeable future. In addition, ball valves will also become one of the leading valve types in large and medium-sized calibers and medium and low pressure fields in other industries.
Ball valve parameter level
1. Nominal pressure or pressure level: PN1.0-32.0MPa, ANSI CLASS 150-900, JIS10-20K
2. Nominal diameter or caliber: DN6-900, NPS 1/4~36
3. Connection method: flange, butt welding, thread, socket welding, etc.
4. Applicable temperature: -196℃~540℃
5. Drive mode: manual, worm gear transmission, pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage
6. Valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8(304), CF3(304L), CF8M(316), CF3M(316L), Ti. Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.