How the globe valve works

Release time:

2022-07-04

How the globe valve works

Globe valve, also known as cut-off valve, is one of the most widely used valve companies. Due to the small friction between the sealing surfaces during the opening and closing operation, it is more durable, the opening height does not change much, the manufacturing technology is convenient, and the maintenance management is convenient. , not only for medium and low pressure, but also for high pressure. The closing principle of the globe valve is to close the sealing surface of the valve disc and the sealing surface of the valve seat through the pressure of the valve stem to prevent the medium from flowing. There are regulations on the "three directions" of valves in our country. The flow direction of the globe valve is from top to bottom, so the installation direction is directional. The structural length of the globe valve is longer than that of the gate valve, the fluid resistance is large, and the sealing reliability is not strong during long-term operation.

As an important globe valve, the globe valve plays an important role in the aerospace field. As an important part of aerospace equipment, the globe valve realizes the functions of conveying, stopping and regulating the medium, and its sealing performance directly affects the safe and reliable operation of aerospace equipment. Studying the social factors and laws affecting the sealing characteristics of typical globe valves has important guiding practical significance for the design and development of the structure of the valve sealing pair, so as to continuously improve the sealing performance and reliability of the valve.

Working principle and characteristics of globe valve: The valve plays an important role in cutting off and throttling the medium in the pipeline. As an extremely important stop valve, its sealing is through the torque of the valve stem, to the axial direction of the pressure of the disc, so that the sealing surface of the disc is in close contact with the sealing surface of the seat to prevent the medium from leaking along the gap between the sealing surfaces. .

The sealing pair of the globe valve is composed of the sealing surface of the valve disc and the sealing surface of the valve seat. The valve stem drives the valve disc to move vertically along the center line of the valve seat. During the opening and closing process of the stop valve, the opening height is small, the flow adjustment is easy, the manufacture and maintenance are convenient, and the pressure application range is wide.

Compared with another globe valve gate valve commonly used in industrial production, the globe valve has a simple structure and is easy to manufacture and maintain in China. In terms of economic life, the sealing surface of the stop valve is not easy to wear and scratch, and there is no relative sliding between the disc and the sealing surface of the seat during the opening and closing process of the valve, so the factors affecting the working level of the sealing system affect the wear The friction and abrasion are small, so we can improve the service life of the sealing pair. The stop valve has a small disc stroke in the process of fully closing, and its high social development ability is relatively small. The disadvantage of the globe valve is that the opening and closing torque is large, and it is difficult to achieve economical and rapid opening and closing, because the flow path in the valve body is seriously curved, and the flow resistance of the fluid passing through is relatively large, resulting in a greater risk of loss of different fluids as power in the pipeline .

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