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Coil Specifications Abbreviations and Symbols

Maximum Ambient Temperature Ratings for ASCO Coils â‘ 
Abbreviation Descriptions AL Aluminum ULApproved Class FTemp.ËšF DesignLimit Class FTemp.ËšF ULApproved Class H Temp.ËšF DesignLimit Class HTemp.ËšF UL Approved and Design Limit Type 7 & 9 Temp.ËšF
BR Brass Wattage
BZ Bronze ➂ �
CA Acetal, Celcon, Delrin 0.5 - - - 158 -
EPDM Ethylene Propylene 0.65 - - - 77 -
FKM Fluorocarbon Elastomer 1.6 122 122 - - -
GP General Purpose (Enclosure Type) 2.0 - - - 158 -
LED Light Emitting Diode 2.5 140 140 - - -
NBR Nitrile Butylene 3.0 125 125 - - -
NC Normally Closed (Operation Type) 5.9 125 125 - - -
NO Normally Open (Operation Type) 6.0 - - 125 125 -
NPBR Nickel Plated Brass 6.1 125 245 140 284 140
OF Open Frame (Enclosure Type) 6.3 135 135 - - 104 6.5 104 104 - - -
PA Poly Amide 6.9 77 77 - - 104
PA+FV Glass Filled Poly Amide 9.1 125 173 - - -
PBT Polybutylene Terephtalate 10.0 140 140 - - -
PC Polycarbonate 10.1 125 245 140 284 140
PE Polyethylene 11.2 140 140 - - -
PEEK Polyetheretherketone 10.6 125 125 - - 104
PL Plastic 11.6 104 104 - - 104
PTFE Polytetrafluoroethylene 12.0 131 131 - - 104
POM Poly Oxymethylene 12.1 - 125 - - -
SPDT Single Pole Double Throw (Mechanical Switch Type) 13.8 - 125 - 140 -
SS Stainless Steel 14.9 77 77 104 104 -
U Universal (Operation Type) 15.4 77 171 104 213 104
UNF Unified National Fine (Thread type) 16.1 - - 140 284 140
UR Urethane 16.7 104 104 104 104 104 17.1 - 245 - 212 140
VDR Varistor for Surge Suppression 20.0 77 125 - - 104
WT Watertight (Enclosure Type) 20.1 - 173 - 212 140
ZN Zinc 22.6 104 104 - - -
� Safety Shutoff 24.6 - - 104 104 104
â—� General Service 28.0 - - - - 104
� Recognized Solenoid 28.2 125 125 - - - 30.6 - - 77 - 104 ① Temperature ratings based on fluids at standard temperature. � 104˚F for Zone G. ➂ For information on 0.44 and 1.4 watt valves please see Catalog 33A.

ASCO TODAY Catalog (V7375R1) - 181 General Information on Elastomer Materials Frequently Used

NBR(Buna “N”, Nitrile) NBR is commonly referred to as a nitrile rubber and is the standard synthetic elastomer for accomplishing resilient-type seating or sealing in ASCO valves. It has excellent compatibility for most air, water, and light oil applications. It has a usefultemperature range of 0°F to 180°F (-18°C to 82°C). EPDM (Ethylene Propylene) FKM (Viton EPDM is selected for applications above the NBR temperature range, such as handling hot water and steam. Ethylene propylene has an extremely wide range of fluid compatibility, but has the distinct disadvantage that it cannot be used with petroleum-based fluids or contaminated fluids (such as lubricated air). It has a useful temperature range of -10°F to 300°F (-23°C to 149°C). PTFE (Teflon

®

/Fluorel

®

, etc.) FKM is a fluorocarbon elastomer primarily developed for handling such hydrocarbons as jet fuels, gasolines, solvents, etc., which normally cause detrimental swelling to NBR. FKM has a high temperature range similar to EPDM, but with the advantage of being somewhat more resistant to “dry heat.” FKM has a wide range of chemical compatibility. It has a useful temperature range of 0°F to 350°F (-18°C to 177°C).

®

, Rulon) PTFE, and PTFE with fillers are considered more a plastic than a resilient-type material. They are virtually unattacked by any fluid.Their temperature usage has ranged from discs for cryogenic valves to discs for steam valves. They are not easily fabricated andare known to have “cold flow” characteristics which may contribute to objectionable leakage, particularly on gases.

Viton is a registered trademark of DuPont Performance Elastomers. Teflon is a registered trademark of DuPont Co. Fluorel is a registered trademark of 3M Co.

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