1. Classification by function: 1. Bypass valve: The ball valve
is generally opened for still water, so the bypass valve is set to be flat pressured first, that is, the two sides are filled with water; 2. Air valve: When water is filled, the valve is closed by itself when the air is removed and the buoy is used. ;When draining water, it is used to supplement air, and the buoy will drop by itself; 3. Pressure relief valve: When the valve is opened and closed, the pressure water between the valve and the sealing cover is removed to avoid wear of the sealing cover; sewage. 2. According to the classification of transmission: 1. Pneumatic ball valve 2, electric ball valve 3, hydraulic ball valve 4, gas-hydraulic ball valve 5, electro-hydraulic ball valve 6, turbine transmission ball valve 3. Classification characteristics: Ball valves are divided into: floating ball valve, Fixed ball valve, orbital ball valve, V-shaped ball valve, three-way ball valve, stainless steel ball valve, cast steel ball valve, forged steel ball valve, ash discharge ball valve, anti-sulfur ball valve, pneumatic ball valve, electric ball valve, ferrule ball valve, welded ball valve. According to the shell/body material classification, the ball valve can be divided into: 1. Metal material valve: such as carbon steel valve, alloy steel valve, stainless steel valve, cast iron valve, titanium alloy valve, Monel valve, copper alloy valve, aluminum alloy valve, Lead alloy valves, etc. 2. Metal valve body lined valve: such as rubber-lined valve, fluorine-lined valve, lead-lined valve, plastic-lined valve, enamel-lined valve. 3. Non-metallic material valve: such as ceramic valve, glass valve, plastic valve. There are many domestic manufacturers of ball valves, and most of the connection sizes are not uniform. It is mainly divided into the following categories: The ball of the ball valve is floating. Under the action of the medium pressure, the ball can produce a certain displacement and be pressed on the sealing surface of the outlet end to ensure the sealing of the outlet end. The structure has good sealing performance, but the load of the sphere bearing the working medium is all transferred to the outlet sealing ring. Therefore, it is necessary to consider whether the material of the sealing ring can withstand the working load of the sphere medium. When subjected to high pressure shock, the sphere may be biased. shift. This structure is generally used for medium and low pressure ball valves. The ball of the ball valve is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure the sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared, which not only inject special lubricating oil between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. Suitable for high pressure and large diameter ball valves. 4. Elasticity The ball of the ball valve is elastic. Both the ball and the valve seat sealing ring are made of metal materials, and the sealing specific pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This valve is suitable for high temperature and high pressure medium. The elastic sphere is to open an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When the channel is closed, the wedge head of the valve stem is used to expand the ball and compress the valve seat to achieve sealing. Before turning the ball, loosen the wedge head, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface. 5. Qv347, Qv647, Qv947 V-type regulating ball valve Qv347, Qv647, Qv947 V-type regulating ball valve has a shearing effect on the valve seat because the ball core has a V-shaped structure. Therefore, it is suitable for the control of relevant process parameters in the suspension medium containing fibers or tiny solid particles in papermaking, chemical, metallurgical and other industrial enterprises, especially for pulp, white water, black liquor, white Automatic adjustment of fluids of suspended particles such as liquids and thick and turbid slurry fluids. This V-shaped ball valve is a fixed ball valve, and it is also a single-seat sealed ball valve. The adjustment performance is the best among the ball valves. The flow characteristics are equal percentages, and the adjustable ratio is 100:1. There is a shearing effect between its V-shaped notch and the metal valve seat, which is especially suitable for media containing fibers, tiny solid particles, slurry and other media. The three-way ball valve has T-shaped and L-shaped. The T type can connect three orthogonal pipes to each other and cut off the third channel, and play the role of diversion and confluence. The L type can only connect two pipes that are orthogonal to each other, and cannot keep the third pipe connected to each other at the same time, and only plays the role of distribution.
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