The ball valve is a type of shut-off valve and is widely used in boiler high-pressure pipelines of thermal power plants, such as hydrophobic, deflation, and pressure measurement points. Because its structure is different from other shut-off valves, it cannot be properly installed and used. , Will cause valve damage, leakage, so that the valve is ineffective, and even cause a major quality of the ball valve is a kind of shut-off valve, widely used in boiler high-pressure pipeline, such as hydrophobic, gas, pressure measurement point and other locations Because its structure is different from other shut-off valves, if it is not properly installed and used, it will cause valve damage, leakage, and loss of the valve, and even cause major quality accidents. This article elaborates the installation and use of valves from aspects of valve structural characteristics, installation and usage precautions, etc., combined with years of on-site installation experience, and has a certain guiding role in the safe and economic operation of thermal power plants.
1. Structure and characteristics analysis
1.1 Structure Introduction Ball Valve Installation The valve body is an assembly. The valve controls the on/off status of the valve through the rotation of the ball (key 19). When the valve is closed, the valve seat is fixed on the valve body (key 20). Part No. 21) withstands the pressure of the media delivered to the ball. The other end of the ball is supported by the valve seat, the disc spring, the transition sleeve and the joint (key 14). The joint and the valve body are welded structure. The stem and the valve body are sealed by the packing group, and the bolted bracket is used. Press firmly. There are three typical valve body valve body: A105, A182-F22 and A182-F91, a wide range of applications, ball valve body structure shown in Figure.
1.2 Characteristics Analysis Since one end of the ball is fixed by the disc spring, the ball valve can only be subjected to one-way force, the medium is one-way flow, and the mass flow direction in the figure is only: right→left.
Due to the simple structure of the ball valve, relatively few components, low price, and a wide range of applications, the valve is relatively cost-effective.
In addition, from the structural point of view, the ball seal is a linear contact surface. Even if the joint is removed, the ball, the disc spring and other components cannot be reset. This valve cannot replace the ball and cannot grind the sealing surface, that is, the valve cannot be disassembled.
1. Structure and characteristics analysis
1.1 Structure Introduction Ball Valve Installation The valve body is an assembly. The valve controls the on/off status of the valve through the rotation of the ball (key 19). When the valve is closed, the valve seat is fixed on the valve body (key 20). Part No. 21) withstands the pressure of the media delivered to the ball. The other end of the ball is supported by the valve seat, the disc spring, the transition sleeve and the joint (key 14). The joint and the valve body are welded structure. The stem and the valve body are sealed by the packing group, and the bolted bracket is used. Press firmly. There are three typical valve body valve body: A105, A182-F22 and A182-F91, a wide range of applications, ball valve body structure shown in Figure.
Figure ball valve main components
1.2 Characteristics Analysis Since one end of the ball is fixed by the disc spring, the ball valve can only be subjected to one-way force, the medium is one-way flow, and the mass flow direction in the figure is only: right→left.
Due to the simple structure of the ball valve, relatively few components, low price, and a wide range of applications, the valve is relatively cost-effective.
In addition, from the structural point of view, the ball seal is a linear contact surface. Even if the joint is removed, the ball, the disc spring and other components cannot be reset. This valve cannot replace the ball and cannot grind the sealing surface, that is, the valve cannot be disassembled.
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