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一、Overview

    With the continuous development of industry, the ball valve, especially high temperature, high pressure severe working conditions under the use of the ball valve demand is growing, the ball valve is required to have wear-resistant, scour-resistant, high temperature resistant, corrosion-resistant and other performance is higher. The traditional full bore ball valve although the ball, valve seat after surfacing, spraying and other technologies for surface hardening, but its service life, cost and performance still do not meet the use of requirements, such as industrial silicon, coal chemical industry, blast furnace gas, gas and other harsh conditions. Double eccentric semi ball valve is a new product developed by absorbing the advantages of different structures of ball valves, V-shaped valves and orbital ball valves. The ball valve adopts double eccentric sealing structure, small wear, small torque, good sealing performance and long service life. The valve seat and hemispherical body are treated with special hardening process, especially adapted to the requirements of abrasion resistance, scouring resistance, corrosion resistance and high temperature resistance under harsh working conditions.

二、Structural characteristics

    The double eccentric semi ball valve is composed of valve body, valve shaft, semi ball body, sleeve, seat and packing. Its semi ball body and seat are the main features of its construction.

    1、Semi ball body: the semi ball body of double eccentric semi ball valve  adopts double eccentric design, its structural principle is that the semi ball body center line is offset from the stem center line, and the seat center line is offset from the seat center line, when fully open, the sphere and the seat are completely disengaged, and there is a certain gap, when the valve is opened and closed, the semi ball body is relatively to the seat surface has a gradual out of the detachment and gradual into the extrusion, thus reducing the mechanical wear and abrasion between the seat and the semi ball when opening and closing, and improving the service life. And can be used in the transport of particles in the harsh conditions of the media.

    2、Valve seat：The valve seat adopts floating design, which reduces the processing difficulty and ensures that the center line of the valve seat coincides with the center point of the semi ball sphere, thus improving the sealing performance. There is a gap between the valve seat and the valve body, the use of semi ball positioning can automatically find the center line, to ensure that the sealing surface of the valve seat and the semi ball body spherical full contact, to solve the leakage caused by machining accuracy errors, improve the use of the ball valve performance and life. In addition, the valve seat and the valve body and the seat and the semi ball body adopt two-point hard seal, so the valve can be used in high temperature and pressure working conditions.

    3、Other parts：Valve overall modular design, simple structure, good reliability, high versatility. The valve stem has an anti-ejection structure. Diversification of drive options. The connection dimensions of the valve stem, bracket and actuator are in accordance with ISO5211 standard, and can be directly assembled with various standard actuators. Commonly used drive mode is manual, pneumatic, pneumatic, pneumatic-hydraulic linkage and electric, which improves the performance of double-eccentric semi ball valve.

三、The scope of application:

      Double eccentric semi ball valves are suitable for all kinds of general industry requirements with valves, such as water, sewage, waste water, steam, gas, pulp and other media. If the sealing vice adopts Cr-Mn-Si hard alloy, and has fire-resistant, explosion-proof and anti-static function, it is suitable for medium and high temperature medium requirements, such as coal gas, coke oven gas, water gas and natural gas and other occasions. If the sealing vice and the flow path of the valve body are processed by tungsten carbide special technology, it has the advantages of high efficiency and energy saving, good abrasion resistance, reliable sealing performance, light operation, rapid opening and closing, and long service life, etc., and it is the ideal choice of the valves for pipeline of the industrial silicon industry. Because of its semi ball body and seat instantaneous detachment and instantaneous compression characteristics, suitable for media containing particles in the harsh conditions, can be widely used in metallurgy, mineral processing, electric power and other production processes such as blast furnace pulverised coal blowing, pulverising system, and dust removal system in a variety of pipeline control. In the process of instantaneous detachment and instantaneous compression, the semi ballC and the valve seat have squeezing and cutting action can remove the scale and adhesion on the sealing surface, to ensure a tight and reliable seal. It is the ideal choice of valve for conveying two-phase mixing fluid medium in the process such as solution slurry, slurry ash and so on, which is easy to precipitate scaling, crystallisation and precipitation.

    The double eccentric semi ball valve adopts double eccentric sealing structure, which is wear-resistant, scour-resistant, corrosion-resistant, high temperature-resistant, and has a long service life. Seat floating design, good sealing performance. Suitable for harsh working conditions, such as metallurgy, electric power and so on. Has been widely used in different industries with good results.

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