The sealing material used in the valve

The valve is an indispensable key component in the fluid control system, and the choice of sealing material has a crucial impact on the performance and service life of the valve. Valve sealing materials need to withstand the role of media pressure, temperature, corrosion and other factors, so the selection of suitable sealing materials is to ensure that the valve sealing performance is stable and reliable key. This paper will introduce the commonly used sealing materials of valves and their performance characteristics.

First, the type of valve sealing material

1. Metal sealing materials: metal sealing materials mainly include stainless steel, copper, aluminum, etc. The metal sealing material has the advantages of high strength, high temperature resistance, corrosion resistance, etc., and is suitable for valve sealing in harsh environments such as high pressure, high temperature or corrosive media. However, metal sealing materials require a large preload during the sealing process and are easy to wear, so attention needs to be paid to maintenance and replacement.

2. Non-metallic sealing materials: non-metallic sealing materials mainly include rubber, plastic, graphite and so on. Non-metal sealing material has good elasticity and corrosion resistance, suitable for low pressure, room temperature or general corrosive media environment. Among them, the rubber sealing material is one of the most commonly used non-metallic sealing materials, which has good sealing performance and low price, but poor high temperature and oil resistance.

3. Composite sealing materials: composite sealing materials combine the advantages of metal and non-metallic materials and have better comprehensive performance. Common composite sealing materials are metal coated rubber, ceramic fiber reinforced plastics and so on. Composite sealing materials are suitable for a variety of environments and use cases, but the price is relatively high.

Second, the performance requirements of valve sealing materials

1. Corrosion resistance: The valve sealing material should have good corrosion resistance and be able to resist the chemical erosion in the medium to maintain the sealing performance.

2. Temperature resistance: the valve sealing material should be able to maintain stable performance in high or low temperature environments, without deformation or failure.

3. Wear resistance: The valve sealing material should have a certain wear resistance, which can resist the erosion of particles or fluids in the medium and extend the service life.

4. Sealing performance: the sealing material of the valve should have good sealing performance, which can effectively prevent the leakage of the medium and ensure the normal operation of the valve.

Third, the principle of selection of valve sealing materials

When selecting the valve sealing material, it is necessary to consider factors such as the nature of the medium, working pressure, temperature range, sealing requirements and cost. For harsh environments such as high pressure, high temperature or corrosive media, metal sealing materials or composite sealing materials with good high temperature and corrosion resistance should be selected; For low pressure, room temperature or general corrosive media environment, non-metallic sealing materials, such as rubber sealing materials, can be selected. In addition, it is necessary to pay attention to the wear resistance and sealing performance of the sealing material to ensure the service life and sealing effect of the valve.

Iv. Summary

Valve sealing material is the key factor to ensure the stability and reliability of valve sealing performance. This paper introduces the sealing materials commonly used in valves and their performance characteristics, including metal sealing materials, non-metal sealing materials and composite sealing materials. At the same time, it also emphasizes the requirements of corrosion resistance, temperature resistance, wear resistance and sealing performance that the valve sealing materials need to meet. When selecting the valve sealing material, it is necessary to consider factors such as the nature of the medium, working pressure, temperature range, sealing requirements and cost to ensure the service life and sealing effect of the valve