Soft seal butterfly valves are mostly used in building systems, tap water industry, sewage treatment industry, petroleum, chemical industry, metallurgy, municipal construction, etc., used for low-temperature medium and low-pressure working conditions, as a cut-off.
The application of soft sealing butterfly valve is mainly affected by the sealing material, and different sealing materials correspond to different working conditions.
In MF Valve factory, we use sealing materials for soft seal butterfly valves by EPDM, NBR and PTFE.
Compared with other ordinary rubbers, EPDM: has great advantages as following:
1.High Cost Performance.
2.EPDM rubber material is resistant to aging, sunlight, heat, moisture and radiation.
3.EPDM rubber is suitable for weak acid and weak alkali media.
4.Good insulation performance
Applicable temperature range of EPDM rubber is -40°C – 60°C, 130℃ can be used for a long time
NBR (Nitrile rubber) has good oil resistance, heat resistance and abrasion resistance, as well as good water resistance, air tightness and excellent bonding performance.
NBR is widely used in petroleum pipelines, but its disadvantages are low temperature resistance, ozone resistance, poor insulation, and universal elasticity.
PTFE(polytetrafluoroethylene) is fluoroplastic and this material has strong acid & alkali resistance, resistance to various organic solvents. At the same time, the PTFE material is resistant to high temperatures which can be used continuously at 260°C, and the maximum use temperature can reach the emergence of 290-320°C , PTFE has successfully solved many problems in the chemical, petroleum, and pharmaceutical industries.
