NEWS

The internal sealing performance of a valve is the main indicator for evaluating the valve. The internal components are the main working parts of the valve, and whether the material selection is reasonable and its quality status directly affects the service life of the valve.

1、 Requirements for sealing surface material
– Has good welding and machining process performance.
– Sufficient antioxidant and thermal fatigue resistance at high temperatures.
– The sealing surface and the body material have a similar linear expansion coefficient to avoid welding cracks.
– It is necessary to have anti scratch performance, and the damage caused by friction of the material during the relative movement of the sealing surface.
– Causing seal failure.
– Must have corrosion resistance.
– Erosion resistance is particularly important when used in high-pressure steam.

2、 Working environment of sealing surface

Valves are widely used, and the working environment of the sealing surface varies greatly. Some are used in high temperature and high pressure situations, while others are used in low temperature, with significant differences in media. There are non corrosive media, highly corrosive media, and some also contain granular media. From the perspective of the force on the sealing surface, there are squeezing and shearing, so the sealing surface is subject to wear, corrosion wear, and erosion. Therefore, it is necessary to consider different working conditions, Select the appropriate sealing and material matching.

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