Ball valve overview
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The ball valve is a valve that uses a sphere with a circular passage as the opening and closing part, and the sphere rotates with the valve stem to realize the opening and closing action. The opening and closing part of the ball valve is a ball with a hole, which rotates around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. 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, quick and easy opening and closing. 2. Small fluid resistance. 3. Simple structure, relatively small size, light weight, and easy maintenance. 4. Good sealing performance. 5. It is not limited by the installation direction, and the flow direction of the medium can be arbitrary. 6. No vibration, 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 seal ball valve; according to the channel, it can be divided into straight 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 ball valve two. According to the connection method, it can be divided into three types: threaded connection ball valve, flange connection ball valve and welded ball valve.
Ball valve installation and maintenance should pay attention to the following items: 1. There should be a position for the valve handle to rotate. 2. Cannot be used as throttling. 3. The ball valve with transmission mechanism should be installed upright.
Nominal pressure or pressure level: PN1.0-32.0MPa, ANSI CLASS 150-900, JIS10-20K Nominal diameter or bore: DN6~900, NPS 1/4~36 Connection method: flange, butt welding, thread, socket Applicable temperature for insertion welding: -196℃～540℃ Driving mode: manual, worm gear transmission, pneumatic, electric, hydraulic, gas-hydraulic linkage, electro-hydraulic linkage 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.