Title: Guide to the selection of valve sealing materials.
Dear readers, hello! I'm in the pump valve pipeline business. In the fluid transfer system, the valve is an indispensable component, and the sealing performance of the valve is directly related to the safety and efficiency of the whole system. Today, we will talk about the selection and use of valve sealing materials.
Valve sealing materials can be divided into two categories: metal and non-metal according to their chemical properties and physical properties. Each material has its specific conditions for use, including temperature, pressure, media type, and more. The correct selection of valve sealing materials is essential to ensure the long-term stable operation of the valve.
First, let's take a look at common valve sealing materials and their scope of application:
1.Synthetic rubber: It has good oil resistance, temperature resistance and corrosion resistance, and is suitable for globe valves, gate valves, diaphragm valves, butterfly valves, check valves, pinch valves, etc. with nominal pressure of PN 1MPa.
2.Nylon: It has low friction coefficient and good corrosion resistance, and is suitable for ball valves, globe valves, globe valves, etc. with temperature T 90 and nominal pressure PN 32MPa.
3.PTFE: It has excellent high temperature resistance and corrosion resistance, and is suitable for temperature t 232 and nominal pressure pn 64MPa globe valves, gate valves, ball valves, etc.
4.Cast iron: suitable for temperature t 100, nominal pressure pn 16MPa, used for gas and oil gate valves, globe valves, plug valves, etc.
5.Babbitt: suitable for temperature t-70 150, nominal pressure pn 25MPa shut-off valve for ammonia.
6.Copper alloy: with excellent wear resistance, suitable for temperature t 200, nominal pressure pn 1In 6MPa water and steam, it is often used in gate valves, globe valves, check valves, plug valves, etc.
7.Chromium stainless steel: quenched and tempered, with excellent corrosion resistance, suitable for water, steam and petroleum media with temperature T 450 and nominal pressure T 32MPa.
8.Incontinol stainless steel: It has good corrosion resistance, erosion resistance and heat resistance, and is suitable for temperature T 600 and nominal pressure T 64MPa steam, nitric acid and other media.
9.Nitriding steel: It has good corrosion resistance and scratch resistance, and is suitable for power station gate valves with temperature T 540 and nominal pressure PN 10MPa.
10.Boronite: It is used to improve the wear resistance of the valve sealing surface material, and is suitable for power station blowdown valves.
When selecting valve sealing materials, it is necessary to comprehensively consider factors such as the type of medium, temperature, pressure and the working environment of the valve. Different materials exhibit different properties under different working conditions, so the correct selection of valve sealing materials is essential to ensure the long-term stable operation of the valve.
Hopefully, the above will help you better understand the principles of valve sealing material selection. If you encounter any questions in practical applications, please feel free to contact us, we will be happy to answer for you.
Thank you for reading, and stay tuned for our next installment. Thank you again for your attention and support to the operation of pumps and valves!