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BUTTERFLY VALVES [18]
Resilient Seat Material for Butterfly Valves
Resilient Seat Material for Butterfly Valves
COMMON NAME
ASTM
DESIGNATION
D1418-64
COMPOSITION GENERALLY
RESISTANT TO
GENERALLY
AFFECTED OR
ATTACKED BY
Buna-N or Nitrile
NBR
Nitrile Butadiene
Many Hydrocarbons, fats, oils,
greases, hydraulic fluids and
chemical
Ozone’s, keytones, esters,
aldehydes, chlorinated and
nitro hydrocarbons Temp. + 100°C
EPT or EPDM
EPDM Ethylene-propylene-
dieneterpolymer
Animal and vegetable oils, ozone,
strong and oxidising chemicals
Mineral oils and solvents,
aromatic hydrocarbons
Temp. + 120°C
Viton
FPM Hexfluoropropylene
Vinylidene Fluoride
All aliphatic, aromatic and
halogenated Hydrocarbons,
acids, animal and vegetable oils
Keytones, Low mole weight
ester and nitro containing
compounds Temp. + 150°C
Teflon
TFE
Tetrafluoro-Ethylene Resin Most know fluid chemicals -
Temp. + 230°C
Specific Resistance
NBR EPDM VITON TFE
Abrasion Good Good Good Good
Oxidisation Good Excellent Excellent Excellent
Heat Aging Good Excellent Very Good Excellent
Flame Poor Poor Excellent Excellent
Oil Very Good Poor Excellent Excellent
Fuel Good Poor Excellent Excellent
Keytones/Esters Fair Excellent Poor Excellent
Aliphatic Hydrocarbon Excellent Poor Excellent Excellent
Aromatic Hydrocarbon Fair Poor Excellent Excellent
Water Good Very Good Very Good Excellent
Torque
SIZE PN16 (N.M)
2 16.51
2 1/2 19.435
3 26.364
4 38.87
5 68.107
6 89.57
8 129.454
10 340.288
12 343.07
14 730.08
16 1132.04
18 1508.78
20 1885.52
24 2389.66