Teflon Diaphragm
Viton Diaphragm
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Reotemp’s Threaded Offline Non-Metallic Diaphragm Seals are designed with an upper and lower housing bolted together with a Teflon or Viton diaphragm bonded to the upper housing. This design allows for the lower housing to be removed for easy cleanout of the seal chamber while still maintaining the system fill. The Teflon and Viton diaphragms are ideal for protecting the pressure instrument from corrosive process fluid.

  • Removable Lower Housing Design for Easy Cleanout
  • Wide Variety of Plastic and Metallic Lower Housing Materials
  • Highly Sensitive and Corrosion Resistant Diaphragm
  • High Displacement Diaphragms Ideal for Mechanical Differential Pressure Gauges and Low Pressure Gauges

Construction Materials

Diaphragm (Wetted): Teflon Virgin PTFE or Viton A.
Lower Housing (Wetted): 316/316L SS, Hast C-276, Monel A400, Alloy 20, Teflon PTFE, PVC or others.
Gasket: PTFE Durlon 9600 or Viton A
Upper Housing (Non-wetted): 316/316L SS or Carbon Steel Nickel Plated

Process Temperature Limits

Lower Housing Diaphragm Max. Temp.
Metallic Lower Teflon 450ºF
Viton 300ºF
Non-Metallic Lower Teflon 140ºF
Viton 140°F

Ambient Temperature Limits

Determined by the Pressure Instrument

Minimum Recommended Span

T5 T6 V5
2.5” & 3.5” Gauges 15 psi 60” H2O 25” H2O
4”, 4.5”, & 6” Gauges 15 psi 60” H2O 25” H2O
*Transmitter (Gauge Pressure) 15 psi 5 psi 30” H2O
*Transmitter (Differential Pressure) n/a 200” H2Od 60” H2Od
Differential Pressure Gauge (D40/42 ONLY) n/a 300” H2Od 100” H2Od

Maximum Working Pressure at 100°F

Bolts Grade 5 Grade 8 18/8SS 316SS
Metallic Lower, T51, V51 2,500 2,500 1,500 1,500
Metallic Lower, T61 1,500 1,500 1,000 750
Non-Metallic Lower 300 300 300 300

Note: All pressures in psi.