Page 292 - Peter Paul 2019 Catalog

SEAL MATERIAL
FPO
Seal Material
Peter Paul Electronics offers a large selection of optional seal materials. Standard seal material for catalog valves is nitrile elastomer, a good general purpose compound, satisfactory for most applications. Insert materials such as FKM, Nordel, KeL-F®, and Teflon® are available for applications where excessive heat is a factor, or for use with any media that can cause insert swelling or deterioration. Consult factory for proper usage.
TRADE NAME
COLOR CODE
Hypalon®
Green
Perlast®
Black
Neoprene®
Red
Neoprene®
Black
Nylon®
Opaque
Teflon®
White
Urethane®
Yellow
TRADE NAME
COLOR CODE
FKM
Brown
Santoprene®2
Off-White
KEL-F®1
Opaque
Nitrile (Buna N)
Blue
Nordel
Gray
Silicone
Red
Perlast® Seals
Affordable for Volume Valve Applications
Perlast® Perfluorocarbon elastomer seals, a product of Precision Polymer Engineering Limited, are highly resistant to more than 1600 chemicals. They are practically inert to most chemically-induced swelling and last longer than other elastomer seals. With a useful temperature range of +20°F to +500°F, Perlast is versatile enough for use in many challenging environments. For higher or lower temperatures, please consult the factory. Perlast® is an expensive design material, even for medical and chemical resistant appli- cations where no other seal material is durable enough. These molded seals often double the price of comparable valves incorporating other elastomer seals. This can be a “non-starter” for many applications and designs that are highly price sensitive.
At PeterPaul, we’ve developed a significant cost saving procedure for laser-cutting Perlast® from sheet stock for use in our solenoid valve plunger assemblies. The amount of material used for each seal is reduced by half, thus reducing the cost per seal, even in small quantities, by as much as 40 to 60 percent. Previously molded seals, requiring more than double the amount of Perlast®, are replaced by a seal disc and stainless steel cup which are pressed together into a plunger blank. The seal cup controls the plunger length more efficiently and two notches on the seal circumference allow the seal to vent gases from within the plunger assembly.
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