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Ashcroft Type 300 Series Welded Diaphragm Seals

Welded Diaphragm Seals

  • 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 connection

Model Index for Diaphragm Seals

Type 310, 315

All Welded Mini Seal

Male-Female threaded 

Type 311

Midi-Diaphragm Seal

Female and Male Threaded

Type 312

Midi-Diaphragm Seal

Female NPT with Flushing Connection

Type 330

Mini Flush Diaphragm

1" Male NPT

Type 400, 401

Diaphragm Seal Welded

1" Male NPT 

Type 402, 403

Flanged Diaphragm Seal Welded


Type 500, 501

Diaphragm Seal Welded

Type 510, 511

Diaphragm Seal Welded

Type 740, 741

High Displacement Welded Seal