The ball valve is a valve that uses a sphere with a circular channel as the opening and closing part, and the sphere completes the opening and closing action with the rotation of the valve stem. The opening and closing part of the ball valve is a holed sphere, which rotates around the axis perpendicular to the passage, so as to achieve the purpose of opening and closing the passage. Ball valves are mainly used to open and close pipelines and equipment media.
The main advantages of the ball valve are as follows: 1. Suitable for frequent operation, opening and closing quickly and lightly. 2. The fluid resistance is small. 3. Simple structure, relatively small size, light weight and easy maintenance. 4. Good sealing performance. 5. It is not restricted by the installation direction, and the flow direction of the medium can be arbitrary. 6. No vibration and low noise.
Classification of ball valves :
According to the structure, the ball valve can be divided into: floating ball valve, fixed ball valve, elastic ball valve and oil-sealed ball valve; according to the channel, it can be divided into direct energy ball valve, angle ball valve and three-way ball valve, etc. The three-way type can be divided into T-shaped ball valve and L-shaped Two kinds of ball valves. According to the connection method, it can be divided into three types: threaded connection ball valve, flange connection ball valve and welded ball valve.
The installation and maintenance of the ball valve should pay attention to the following precautions: 1. The specific position of the valve handle should be reserved. 2. It cannot be used as a throttling. 3. The ball valve with drive mechanism should be installed upright.
Nominal pressure or pressure level: PN1.0-32.0MPa, ANSICLASS150-900, JIS10-20K Nominal diameter or caliber: DN6～900, NPS1/4～36 Connection mode: flange, butt welding, thread, socket welding, etc. Suitable temperature: -196℃～540℃ Drive mode: manual, worm gear drive, pneumatic, electric, hydraulic, gas-liquid linkage, electro-hydraulic linkage Valve body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8(304), CF3(304L ), CF8M (316), CF3M (316L), Ti. Different materials are selected, which can be suitable for many kinds of media such as water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc.
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