Soft seal butterfly valve is usually the middle line butterfly valve. Its driving mode is common with the handle, turbine, pneumatic, electric four. The connection form has two common types: clamp and flange. Soft seal butterfly valve is named because of its sealing surface material. “Soft seal butterfly valve in which occasions to use” this problem. The influencing factor is the sealing surface material of the soft seal butterfly valve.
The sealing surface material of the soft sealing butterfly valve is commonly EPDM EPDM ethylene propylene rubber, NBR nitrile rubber, PTFE polytetrafluoroethylene three kinds. These three sealing materials to adapt to the medium is not the same. The corresponding butterfly valve use occasion is not the same. The general De hall Debao hair for you to introduce in detail .
EPDM ethylene propylene diene rubber, suitable for temperature -40~120℃, applicable media including water, steam and other weak acid alkaline medium. Its advantages are ozone resistance, heat resistance, aging resistance. With ethylene propylene diene rubber as the sealing surface of the soft seal butterfly valve is widely used in construction, power generation, water conservancy and other fields.
NBR nitrile rubber, applicable temperature -30~90℃, applicable media such as water, oil, waste liquid, etc. Its advantages are good oil resistance, wear and heat resistance, strong adhesion. Disadvantages are low temperature resistance, poor ozone resistance, poor insulation performance, slightly lower elasticity. The soft sealing butterfly valve with nitrile rubber as the sealing surface is used in lubricating oil, oil, aviation, automobile, printing, textile and machinery manufacturing.
PTFE polytetrafluoroethylene, applicable temperature -196~200℃, suitable medium is some corrosive liquid. Its advantages are heat resistance, cold resistance, resistance to general chemical solvents and almost all liquids. With PTFE as the sealing surface of the soft seal butterfly valve is widely used in chemical industry, petrochemical, oil refining, chemical fiber, non-ferrous smelting and other fields.