Jan.26.2025
The valve seat is an important removable component inside industrial valves, primarily used to support the valve core and ensure its stability in both fully closed and fully open positions, while also forming a sealing system together with the valve core. EPDM (ethylene propylene diene monomer) and PTFE (polytetrafluoroethylene) are common sealing materials. Fleyenda will provide a detailed overview of the different characteristics of EPDM butterfly valves and PTFE butterfly valves, and how to choose the most suitable butterfly valve.
Left: Fleyenda EPDM Butterfly Valve Right: Fleyenda EPDM Butterfly Valve
EPDM butterfly valves are made from ethylene propylene diene monomer rubber, which is polymerized from ethylene, propylene, and non-conjugated diene, offering excellent ozone resistance, heat resistance, and aging properties. The operating temperature range for EPDM valves typically lies between -40°C and 120°C, with the capability for long-term use at temperatures up to 130°C. Thanks to these characteristics, EPDM butterfly valves are widely used in construction, power generation, and hydraulic engineering, making them particularly suitable for the transportation and control of mildly acidic and alkaline media such as water and steam.
On the other hand, PTFE butterfly valves are made from polytetrafluoroethylene, a high-performance plastic known for its excellent chemical stability and heat resistance. The operating temperature range for PTFE valves is broader than that of EPDM, functioning normally in environments from -190°C to 250°C, with maximum temperatures reaching up to 290°C to 320°C. Due to PTFE’s chemical inertness and excellent resistance to corrosive media, these valves are especially suitable for high-demand industrial applications such as chemicals, petrochemicals, and pharmaceuticals, easily handling challenges from strong acids, strong bases, and various organic solvents.
From a performance perspective, EPDM butterfly valves are ideal for long-term use in moderate environments, thanks to their ozone resistance and aging properties. Projects in construction and water treatment often prefer valves made of EPDM, especially in pipeline systems that require long-term stable operation. Conversely, PTFE butterfly valves are the preferred choice in industries such as chemicals, petrochemicals, and refining due to their outstanding heat and cold resistance, as well as their tolerance to nearly all liquid chemicals. In these fields, the high corrosiveness of the media and extreme fluctuations in working temperatures demand valve materials with exceptional reliability.
In summary, EPDM butterfly valves are suitable for applications with a wide temperature range and mild media characteristics, such as water treatment, construction, and hydraulics, while PTFE butterfly valves are ideal for high-temperature and highly corrosive media, widely used in high-end sectors like chemicals, petrochemicals, and pharmaceuticals. Choosing the right butterfly valve material based on specific working conditions and media characteristics is crucial.
The following is a comparison table of EPDM Butterfly Valve VS PTFE Butterfly Valve：
|
Property |
EPDM Butterfly Valve |
PTFE Butterfly Valve |
|---|---|---|
|
Material |
Ethylene Propylene Diene Monomer (EPDM) |
Polytetrafluoroethylene (PTFE) |
|
Temperature |
-40~120°C, long-term use up to 130°C |
-190~250°C, performance maintained down to -196°C |
|
Media |
Water, steam, mild acids and alkalis |
Corrosive liquids, such as chemicals and petrochemicals |
|
Application |
Construction, power generation, water treatment |
Chemical, petrochemical, refining, synthetic fiber, non-ferrous smelting |
Fleyenda Flow is committed to providing a comprehensive range of industrial valve solutions while continuously exploring innovations to ensure that every customer finds the most suitable products to meet their unique needs.
