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The Ashcroft® 311 and 312 midi-diaphragm seals are fitted in confined areas to protect measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibit pulsation. Ideal for limited space installations.
311 and 312 Midi-Diaphragm Seals
Unit of Measure
Items 311 and 312 Midi-Diaphragm Seals
311
311 Midi-Diaphragm Seal 		311 and 312 Midi-Diaphragm Seals
312
312 Midi-Diaphragm Seal
Description N/A The Ashcroft® 311 midi-diaphragm seals are fitted in confined areas to protect measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibit pulsation. Ideal for limited space installations. N/A The Ashcroft® 312 midi-diaphragm seals are fitted in confined areas to protect measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibit pulsation. Ideal for limited space installations.
Brands N/A Ashcroft®
Process Connection Size N/A 1/4 to 1 in. National Pipe Thread (NPT) Male or Female N/A 1/4 or 1/2 in. National Pipe Thread (NPT) Female
Instrument Connection Size N/A 1/2 in1/4 in
Instrument Connection Type N/A National Pipe Thread (NPT) Female
Pressure Rating N/A 1,000 psi
Typical Added Tolerance (±) N/A 0.5 %
Connection Style N/A All-Welded N/A All-Welded with Flushing Connection
Key Features N/A
  • Compact and lightweight design
  • Choice of diaphragm and lower housing materials
  • All-welded construction
  • Volumetric displacement allows attachment to: 3 1/2 in gauges (Vacuum to 1,000 psi), 4 1/2 in gauges (30 to 1,000 psi), Transducers and Switches
  • Rated up to 1,000 psi
Applications N/A Process Market:
Oil and Gas
Refineries
Chemical and Petrochemical
Water and Wastewater

Process Applications:
Oil and Gas Fracking
NACE Compliant Processes (Sour Gas Separation)
Biogas and Biodiesel