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Diaphragm Seal - Threaded Offline Welded Metallic



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Threaded Offline Welded Diaphragm Seals are designed with an upper and lower housing bolted together with a diaphragm welded to the upper housing. This removable design allows for easy cleanout of the seal chamber, while still maintaining the system fill. The threaded offline diaphragm seal can be adapted to fit almost any pressure instrument and process application.

  • Welded Diaphragm for Maximum Durability
  • Wide Variety of Diaphragm and Material Options
  • Continuous-duty Disc Protects from Process Fluid Leaking in the Event of a System Breach
  • Easy Cleanout of Diaphragm Cavity without Compromising Filled System


Construction Materials

Diaphragm (Wetted): 316/316L SS, Hast C-276, Tantalum, Monel A400, Nickel 201, or Others Lower Housing (Wetted): 316/316L SS, Hast C-276, Monel A400, Alloy 20, Hast B, 304/304L SS, or Others Gasket (Wetted): Klinger C-4401, PTFE Durlon 9600, Grafoil, Kalrez, or Virgin PTFE Upper Housing (Non-wetted): 316/316L SS, 304/304L SS or Others

Process Temperature Limits

W51/W61 W5K/W6M/W5H
Metallic Lower PTFE Gasket -110/350F -110/400F
Klinger Gasket -110/450F -110/500F
Grafoil Gasket -40/600F -40/750F
Non-Metallic Lower 140°F N/A

Ambient Temperature Limits

Determined by the Pressure Instrument

Minimum Recommended Span

W5 W6
2.5” & 3.5” Gauges 15 psi 200” H2O
4”, 4.5”, & 6” Gauges 30 psi 200” H2O
Transmitter (Gauge Pressure) 150” H2O 60” H2O
Transmitter (Differential Pressure) 300” H2O 60” H2O
Differential Pressure Gauge (D40/42 Only) N/A N/A

Maximum Working Pressure at 100°F

Bolts Grade 5 Grade 8 18/8SS 316SS
Metallic Lower W51 2,500 psi 2,500 psi 1,500 psi 1,500 psi
W5K 5,000 psi 5,000 psi 3,000 psi 2,500 psi
W5H 10,000 psi
W61 1,500 psi 1,500 psi 1,000 psi 750 psi
W6M 2,500 psi 2,500 psi 2,000 psi 2,000 psi
Non-Metallic Lower 300 psi 300 psi 300 psi 300 psi

Datasheet & Drawings

Datasheet Download Threaded Offline Welded Seals Datasheet

Installation Instructions

Download Installation Instructions: