Valves - diaphragms

PTFE diaphragms


PTFE diaphragms

Polytetrafluoroethylene (PTFE) offer the ultimate chemical resistance and purity. Our PTFE diaphragms are extremely chemically resistant, often used with heptane and methyl chloride.

All our diaphragms are laser-etched with cure dates and batch numbers, ensuring that they are completely traceable.

Features and benefits

  • Extremely chemically resistant
  • Good steam resistant
  • Only available for tank valves
  • Must be steamed prior to use

Technical summary

Diaphragm variant(s)Bellows 
Compatible actuatorsModified AJS 
Compatible valvesRadial 
Material specificationVirgin PTFE 8AX 
StandardsASME BPE, RoHS 

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



Flow Coefficient (under standard configuration)
Outlet size Size CV at 1 psi (0.07 bar) KV at 1 psi (0.07 bar)
0.5" 4.3 3.7
1.0" 15.8 13.7
1.5" 48.0 41.5
2.0" 72.0 62.2
3.0" 170.0 146.9
4.0" 302.0 260.9


Technical specifications

PTFE diaphragms
Tank valve sizes0.5" Extended, 1.0", 1.5", 2.0", 3.0" 
Diaphragm variant(s)Bellows 
Parylene treatmentNo 
Operating temperature range -65 °C to 150 °C
Operating temperature range -85 °F to 300 °F
Max. operating pressure4.5 barg
Max. operating pressure50 psig
Compatible actuatorsModified AJS 
Compatible valvesRadial 
Actuator typeManual, Pneumatic 
Steaming required prior to installationYes 
ASME BPE appendix K SIP cycle rating300 
Total actuations during SIP cycle testing3000 
Shelf life5 years
Material specificationVirgin PTFE 8AX 
StandardsASME BPE, RoHS 
Certification and compliance21 CFR 177.1550, ADCF, BSE/TSE free, USP <87>, USP <88> Class VI 
Max. operating pressure varies by size up to maximum indicated

Materials of construction

DiaphragmVirgin PTFE 8AX
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

PTFE diaphragms product codes

Code Product


Radial diaphragm 1" PTFE assembly for standard Asepco actuators, White


Radial diaphragm 1.5" PTFE assembly for standard Asepco actuators, White


Radial diaphragm 2" PTFE assembly for standard Asepco actuators, White


Radial diaphragm 3" PTFE assembly for standard Asepco Actuators, White


Radial diaphragm extended .5" PTFE assembly for standard Asepco actuators

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