Page 383 - ZSi-Foster-Engineering-Catalog
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Seal & Fluid Compatibility Guide
       Seal Material
To Order: Add seal compound part number to the end of coupling part number.
Example: H4S-103, 1/2" NPT, FHK Series, steel socket with ethylene propylene seals (-103).
Note: Please consult with your Foster representative or the factory for any media not listed.
Optional Seal [Ordering]:
Buna-N seal is standard. Alternate seals are specified by adding the appropriate suffix to the catalog number. For example, 3003 socket with Heat Adder is 3003H
Optional Seal Material
1
1 Captive valve seal ensures “bubble tight” poppet sealing since seal is positively captured by the metal poppet to minimize seal washout or damage from high fluid velocity.
2 Broad range of metals and seal materials allow the use of most fluids.
2
 Seal Compound Data
  Seal Material
 Part No. Suffix
  Color Code
  Nitrile (Buna-N)
  Std.
   None
  Viton (product of DuPont)
  -101
 Blue
 Neoprene
   -102
 Red
  Ethylene Propylene
  -103
   Black
  Silicone
   -104
  White
      Service
 Construction
   Seal
 Temperature
 Suffix
   Air, Vacuum, Grease & Oil
 Brass & Steel
   Buna-N
 -40° to +250°F
   none
   Water
 Brass & S/S
 Buna-N
 +32° to +100°F
  W
   Hot Water
  Brass & S/S
  Viton
  -15° to +400°F
   HW
   Steam
Brass Body, Brass Sleeve, & Stainless Steel Valve
  Ethylene Propylene
-40° to +300°F
  S
   Heat
 Brass & Steel
 Viton
 -15° to +400°F
  H
   Less Valve
  Brass & Steel
    Buna-N
  -40° to +250°F
    LV
   Dill Valve Series 3 Only
 Brass & Steel
   Buna-N
 -40° to +250°F
   D
  ZSi-Foster Engineering Catalog
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