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2024/05/10

Why can't double seal valve be used as shut-off valve?

Why can't double seal valve be used as shut-off valve?

The advantage of the double-seat valve spool is the force balance structure, allowing large pressure differences, and its outstanding disadvantage is that the two sealing surfaces cannot be in good contact at the same time, resulting in large leakage. If it is artificially and forcibly used to cut off the occasion, the effect is obviously not good, even if it has made many improvements (such as double-sealed sleeve valve), it is not desirable.

Why can't double seal valve be used as shut-off valve?

2024/05/10

Why is the regulating valve easy to oscillate when the double seat valve is working with small opening?

Why is the regulating valve easy to oscillate when the double seat valve is working with small opening?

For single core, when the medium is open flow type, the valve stability is good; when the medium is closed flow type, the stability of the valve is poor. The double-seat valve has two valve cores. The lower valve core is in flow closure and the upper valve core is in flow opening. In this way, when working with small opening degree, the flow closing valve core is easy to cause vibration of the valve. This is the reason why the double-seat valve cannot be used for working with small opening degree.

Why is the regulating valve easy to oscillate when the double seat valve is working with small opening?

2024/05/10

Why is the stem of the straight stroke regulating valve thinner?

Why is the stem of the straight stroke regulating valve thinner?

It involves a simple mechanical principle: large sliding friction and small rolling friction. Straight travel valve stem up and down movement, packing a little tight, it will be the stem wrapped very tight, resulting in a larger return. For this reason, the valve stem is designed to be very small, and the filler is often used to have a small coefficient of friction to reduce the backwardness. However, the problem caused by this is that the valve stem is thin, which is easy to bend and the filler life is short. To solve this problem, the best way is to use the travel valve stem, that is, the angle of the type of control valve, its stem than the straight stroke stem 2~3 times thicker, and the use of long life of graphite packing, stem stiffness, packing long life.

Why is the stem of the straight stroke regulating valve thinner?

2024/06/14

Fluoroplastic lined corrosion-resistant valves: key equipment in the industrial field, its application scope and importance analysis.

Fluoroplastic lined corrosion-resistant valves: key equipment in the industrial field, its application scope and importance analysis.

Fluoroplastic lined corrosion-resistant valves, as an important industrial equipment, are widely used in various corrosive media environments. The core of this valve is its unique production process and material selection.

Fluoroplastic lined corrosion-resistant valves: key equipment in the industrial field, its application scope and importance analysis.

2024/06/14

Comprehensive understanding of wedge gate valve: the important form of valve opening and closing and its wide application in pipeline system

Comprehensive understanding of wedge gate valve: the important form of valve opening and closing and its wide application in pipeline system

Wedge gate valve, as a common form of opening and closing valve, is widely used in various types of piping systems. This valve is characterized by its gate design for wedge-shaped, the use of both sides of the gate to achieve the sealing of the media in the pipeline or cut off. In practical application, the wedge gate valve has won the favor of the majority of users for its excellent sealing performance and reliable cut-off effect.

Comprehensive understanding of wedge gate valve: the important form of valve opening and closing and its wide application in pipeline system

2024/06/14

Globe valve: working principle and main application

Globe valve: working principle and main application

Globe valve, as a common type of valve, has specific structural features and functions. Its key component is the closure, we usually call the valve, the valve is not independent movement, but by the stem to drive. The valve stem drives the valve disc to move up and down along the central axis of the valve seat, which ensures the stability and reliability of the valve during opening and closing.

Globe valve: working principle and main application
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