News
15
2021
-
09
What is the structure of the blowdown ball valve?
Author:
The blowdown ball valve is installed on the flange of the gate valve according to the pipe diameter. In the cylindrical channel of the valve body, the disc valve plate around the rotation axis has a rotation angle of 0-90 and a rotation angle of 90. Valves are all permissive opening conditions and are normally installed horizontally.
The blowdown ball valve is simple in structure, small in volume and light in weight. Moreover, it can be opened and closed quickly by rotating 90 °, which is easy to operate and has good characteristics of hydraulic control valve. In the fully open position, the thickness of the valve plate is only the resistance of the medium flowing through the valve body, resulting in a very small pressure drop and good flow control characteristics. The valve with long service life of metal seal is generally higher than that of elastic seal, but it is also difficult to completely seal. Metal seal can adapt to higher temperature, while elastic seal has defect temperature limit.
If it is required to be used as a flow control valve, it is mainly to correctly select the size and type of the blowdown ball valve. The structural principle is particularly suitable for the production of large caliber valves. It is not only widely used in oil, natural gas, chemical industry, ship water treatment and other industries, but also widely used in the cooling water system of thermal power plants. The working principle of blowdown ball valve is to rotate the valve core to make the valve unblocked or blocked. The switch is light, small in size, can be made into a large diameter, reliable in sealing, simple in structure, and convenient in maintenance. The sealing surface and spherical surface are often closed, and are not easily eroded by the medium. It is widely used in various industries.
The blowdown ball valve is used in the medium pipeline as a regulation and control function. It is generally installed horizontally in the pipeline, with the functions of distributing, cutting off, and changing the flow direction of the medium. The valve body can be used as a whole or separately. The sealing surface is usually closed to the spherical surface, so it is not easy to be eroded by the medium. It is easy to operate, simple and compact in structure, and can be used in working conditions with water, natural gas, acid, solvent, etc.
Main advantages of blowdown ball valve
1. Simple structure, small volume and light weight.
2. The fluid resistance is small, and the full bore ball valve basically has no flow resistance.
3. It is easy to operate and fast to open and close. Only 90 rotations are required from full opening to full closing, which is convenient for remote control.
4. As the blowdown ball valve has the wiping characteristics during the opening and closing process, it can be used in the medium with suspended solid particles.
5. It is easy to maintain, generally it is a movable seal ring, and it is easy to remove and replace.
6. It has a wide range of applications, ranging from a few millimeters to several meters in diameter, from high vacuum to high pressure.
7. When fully opened or closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and the medium will not cause corrosion of the valve sealing surface when passing through.
8. Tight and reliable. It has two sealing surfaces. At present, the sealing surface of the blowdown ball valve is widely made of various plastics, which has good sealing performance and can achieve complete sealing. It is also widely used in vacuum systems.
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Main： Butterfly valves, blind valves, gate valves, globe valves, ball valves, check valves, regulating valves, gates, metallurgical valves, hydraulic dams
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