Diaphragm Seal 510 - 511

This compact isolator is small enough in design to be used in confined spaces, but provides sufficient displacement to drive a wide variety of instrumentation. 

Its all-welded tamperproof design prevents possible process media leakage.


Features Include:

  • Compact size
  • Light weight
  • All-welded design
  • 1,500 psi rating standard, 5,000 psi rating optional
  • Continuous duty design
  • Minimized fill volume

Male connections eliminate adapters/fittings.

Diaphragm Seals 100

  • The top housing and diaphragm capsule are interchangeable with all Ashcroft bottom housings.
  • A fill/bleed connection is standard, which permits filling the seal and instrument simultaneously after evacuation and allows the fill to flow into the completed unit.
  • An O-ring, compatible with all standard fill fluids, and a Teflon back-up ring provide a seal between the diaphragm capsule and the top housing.
  • The diaphragm is Teflon coated to provide an integral gasket, thus assuring a leak-tight connection between the diaphragm and the bottom housing.
  • Top housing and pressure instrument are removable.
  • Continuous-duty design will prevent loss of process fluid if pressure instrument is removed or fails.

The comprehensive line of Ashcroft diaphragm seals will meet a wide variety of application or installation requirements. Over 30,000 variations are possible with the s, connections and materials available.

Midi-Diaphragm Seal 311

  • All welded metal construction, prevents leakage of process media
  • No gaskets or bolts
  • For use on pressure gauges up to 3.5″ from 60 to 1,000 psi and 4.5″ gauges 100 psi to 1,000 psi
  • Top housing material 316L Stainless Steel standard
  • Diaphragm materials in 316L Stainless Steel, Hastelloy C and Tantalum
  • Bottom housing materials in 316L Stainless steel and Hastelloy C
  • 25 NPT or 0.50 NPT instrument connections
  • Type 312 furnished with 0.25 flushing connection

Type 312 not available in male process connections

Diaphragm Seal 300

  • Broad selection of materials for meeting various service applications, including Teflon, Viton and Kalrez diaphragms.
  • Elastomeric diaphragm is clamped securely between the top and bottom housings by clamp rings, assuring positive seal.
  • Top housing is contoured to match diaphragm, minimizing distortion of the diaphragm should the pressure instrument be removed.
  • Continuous duty.
  • Fill/bleed connection is standard.
  • Top housing and diaphragm are nonremovable.

Teflon, Viton and Kalrez diaphragms available in threaded and flanged inlet connections.