Valves - diaphragms

EPDM diaphragms


EPDM diaphragms

Ethylene propylene diene monomer (EPDM) is fairly chemical resistant and offers quality performances in applications with repetitive steam-in-place (SIP) cycles. EPDM a relatively low cost material widely used in pharmaceutical applications

Features and benefits

  • All EPDM diaphragms are laser-etched with cure dates and batch numbers, ensuring that they are completely traceable
  • Wide temperature range; good in steam applications
  • Not suitable for use with solvents or petroleum agents

Technical summary

Diaphragm variant(s)Bellows, Parylene surface, Straight 
Compatible actuatorsAJS, AKS 
Compatible valvesRadial, Weirless 
Material specificationEPDM with Parylene surface treatment, Ethylene propylene diene monomer (peroxide cured) 
StandardsASME BPE, RoHS, USP VI 

Technical Summary table lists features available within the range. See ‘Specifications’ tab for model specific information.



Flow Coefficient (under standard configuration)
Tank Valve Size CV
0.5" 4.3
1.0" 15.8
1.5" 48.0
2.0" 72.0
3.0" 170.0
4.0" 302.0


Technical specifications

EPDM diaphragms
Tank valve sizes0.5", 0.5" Extended, 0.75", 1.0", 1.5", 1.5" Extended, 2.0", 2.0" Extended, 3.0", 3.0" Extended, 4.0" 
Diaphragm variant(s)Bellows, Straight 
Parylene treatmentNo 
Operating temperature range -51 °C to 135 °C
Operating temperature range -60 °F to 275 °F
Max. operating pressure4.83 barg
Max. operating pressure70 psig
Compatible actuatorsAJS, AKS 
Compatible valvesRadial, Weirless 
Actuator typeManual, Pneumatic 
Curing agentPeroxide 
Steaming required prior to installationNo 
ASME BPE appendix K SIP cycle rating300 
Total actuations during SIP cycle testing3000 
Shelf life5 years
Material specificationEthylene propylene diene monomer (peroxide cured) 
StandardsASME BPE, RoHS 
Certification and complianceADCF, BSE/TSE free, FDA 21CFR177.2600, USP <87>, USP <88> Class VI 
Max. operating pressure varies by size up to maximum indicated

Materials of construction

DiaphragmRS60065B ethylene propylene diene monomer rubber
Inserts304 SS



  1. ASEPCO weirless radial diaphragm valves (US).pdf
    PDF - 605.5kb


  1. ASEPCO diaphragms datasheet (EN).pdf
    PDF - 234.5kb

Order Information

Product codes

EPDM diaphragms product codes

Code Product


Radial diaphragm extended 1.5" EPDM Black


Radial diaphragm extended 2" EPDM Black


Radial diaphragm extended 3" EPDM Black


Radial diaphragm extended .5" EPDM Black


Radial diaphragm .5" EPDM Black Straight


Radial diaphragm 1" EPDM Black Bellows


Radial diaphragm 1.5" EPDM Black Straight


Radial diaphragm 2" EPDM Black Bellows


Radial diaphragm 3" EPDM Black Straight


Radial diaphragm 4" EPDM Black Straight

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