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.
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
Process Connection Size
311: ¼ to 1 NPT Male or Female
312: ¼ or ½ NPT Female
Instrument Connection
¼ or ½ NPT Female
Pressure Rating
1,000 psi
Added Tolerance
±0.5% typical
Connection Style
311: All-Welded
312: All-Welded with flushing connection
