What Type of Valve Seat Should I Use

Some butterfly valve seat characteristics overlap with others. Below is a side-by-side comparison of these materials.

EDPM VS BUNA
EDPM is resistant to acids and ketones. EDPM is not suitable for applications that involve petroleum-based fuels, oil, and non-polar solvents, but BUNA is.

While both EDPM and BUNA are abrasion and tear-resistant, EDPM is more heat-resistant than BUNA. When comparing EDPM vs BUNA, EDPM is better for outdoor applications as it stands up to elements.

VITON VS BUNA
VITON and BUNA are both compression set resistant and endure most oils, lubricants, and petroleum-based material. 

When comparing VITON vs BUNA, the main difference is temperature resistance. VITON maintains a seal with temperatures about 150° hotter than BUNA would. However, BUNA can maintain a seal in much colder temperatures than VITON. 

VITON stands up better to outdoor elements than BUNA, but BUNA is considered to be better for heavy-duty industrial applications.

EPDM VS PTFE
EPDM is a monomer When comparing EPDM vs PFTE, temperature tolerance and flexibility are the main differences. PTFE can withstand a wider range of temperatures of both cold and hot extremes. 

EPDM is a tear-resistant rubber that endures repetitive motion, whereas PFTE is inelastic. PFTE is ideal for petroleum processes while EPDM is suited for HVAC applications.

Contact Butterfly Valves & Controls Today
Having various materials to choose from allows manufacturers to design and develop the best valve seat for each application.

Which type of butterfly valve seat is best for your process? Sometimes valves seem to be almost identical, but there are distinctions. For definitive butterfly control valve seat specs, consult the detailed documentation in our product catalog. If you need assistance in selecting a valve and valve seat, contact us.