Working principle and characteristics of bellows sealed valve
Release date:
2021-08-20
The bellows seal valve is also known as a globe valve. It is a forced sealing valve. When the bellows seal valve is closed, a certain pressure must be applied to the valve disc to ensure it does not leak. When the medium enters the valve from below, the operating force must overcome the corresponding resistance, which includes the friction between the packing and the valve stem as well as the thrust generated by the pressure of the medium.
Bellows Seal Valve Also known as a globe valve, it is a forced sealing valve. When the bellows seal valve is closed, a certain pressure must be applied to the valve disc to ensure it does not leak. When the medium enters the valve from below, the operating force must overcome the corresponding resistance, which includes the friction between the packing and the valve stem as well as the thrust generated by the pressure of the medium. Therefore, the force required to close the bellows seal valve is much greater than the force needed to open it. Generally, the diameter of the valve stem must be larger; otherwise, bending failure may occur. Next, I will share with you the working principle and characteristics of the bellows seal valve to help you better understand this globe valve.
Bellows Seal Valve The valve can throttle and cut off the medium inside the bellows. As a very important segment-type valve, the sealing of the bellows seal valve is achieved by applying torque to the valve stem, causing the valve stem to exert a certain axial pressure, which makes the sealing surface closely fit with the valve seat sealing surface, preventing leakage through the gap between the sealing surfaces. The bellows seal valve consists of the valve disc sealing surface and the valve seat sealing surface. The valve stem can drive the valve disc to move vertically along the centerline of the valve seat.
When Bellows Seal Valve During the opening and closing process, its height is relatively small, making it convenient to adjust the flow. Moreover, both manufacturing and maintenance are very convenient. It is suitable for a wide range of pressures. Compared with another commonly used shut-off valve in industrial production, its structure is simpler, making it easier to maintain and manufacture. On the other hand, the bellows seal valve is not easily worn or scratched, and there is no relative sliding during the opening and closing process, which reduces friction on the sealing surface and improves the service life of the bellows seal valve.
The bellows seal valve refers to a valve where the closing element (valve disc) moves along the centerline of the valve seat. According to this movement of the valve disc, the change in the valve seat opening is directly proportional to the valve disc stroke. Because the valve stem's opening or closing stroke is relatively short and it has a very reliable shut-off function, and since the change in the valve seat opening is proportional to the valve disc stroke, it is very suitable for flow regulation. Therefore, this type of valve is very suitable for shut-off, regulation, and throttling applications.
After reading the above content, I believe the readers present have gained a certain understanding of the bellows seal valve. I hope this article can be helpful to everyone.
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