Ashcroft High Displacement Diaphragm Seal, 702/703 & 740/741
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702/703 & 740/741 High Displacement Diaphragm Seal

Brand: Ashcroft Inc.
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The Ashcroft 702 and 703 high-displacement diaphragm seals or isolation devices are used with low pressure or differential pressure gauges with low differential pressure and elevated static pressure. 

Used to ensure material compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. 

An ideal product for satisfying low pressure measurement needs.
Features
  • For pressure instruments ranging from 30" H2O to 750 psi
  • Used in instruments with large displacement actuators
  • For applications requiring an impermeable metallic diaphragm
  • Available in many material combinations
  • Diaphragm electron beam welded to isolator body
  • Furnished with fill/bleed connection

Specifications

Brand

Applications

  • Biogas & Biodiesel
  • Chemical & Petrochemical
  • NACE Compliant Processes (Sour Gas Separation)
  • Oil & Gas Applications
  • Oil & Gas Fracking
  • Refineries
  • Water & Wastewater

Approvals & Certifications

  • CRN

Diaphragm Material

  • 316L Stainless Steel
  • Hastelloy® B
  • Hastelloy® C-276
  • K-Monel®
  • Tantalum
  • Titanium

Enclosure, Body Material

  • 316L Stainless Steel
  • Bottom: Carpenter 20
  • Bottom: Hastelloy® B
  • Bottom: Hastelloy® C-276
  • Bottom: Tantalum
  • Monel®
  • Titanium

Fill Material

  • Glycerin
  • Halocarbon
  • Silicone
  • Syltherm

Flange Size - 1-1/2" (DN40)

  • 1-1/2" (DN40) - 150# (ASME B16.5)
  • 1-1/2" (DN40) - 300# (ASME B16.5)
  • 1-1/2" (DN40) - 600# (ASME B16.5)

Flange Size - 1" (DN25)

  • 1" (DN25) - 150# (ASME B16.5)
  • 1" (DN25) - 300# (ASME B16.5)
  • 1" (DN25) - 600# (ASME B16.5)

Flange Size - 1/2" (DN15)

  • 1/2" (DN15) - 150# (ASME B16.5)
  • 1/2" (DN15) - 300# (ASME B16.5)
  • 1/2" (DN15) - 600# (ASME B16.5)

Flange Size - 2-1/2" (DN65)

  • 2-1/2" (DN65) - 150# (ASME B16.5)
  • 2-1/2" (DN65) - 300# (ASME B16.5)
  • 2-1/2" (DN65) - 600# (ASME B16.5)

Flange Size - 2" (DN50)

  • 2" (DN50) - 150# (ASME B16.5)
  • 2" (DN50) - 300# (ASME B16.5)
  • 2" (DN50) - 600# (ASME B16.5)

Flange Size - 3" (DN80)

  • 3" (DN80) - 150# (ASME B16.5)
  • 3" (DN80) - 300# (ASME B16.5)
  • 3" (DN80) - 600# (ASME B16.5)

Flange Size - 3/4" (DN20)

  • 3/4" (DN20) - 150# (ASME B16.5)
  • 3/4" (DN20) - 300# (ASME B16.5)
  • 3/4" (DN20) - 600# (ASME B16.5)

Flange Type

  • Flat Face (FF)
  • Ring Joint Facing

NACE & NIST

  • NACE

NPT Connection

  • 1" NPT Female
  • 1/2" NPT Female
  • 1/4" NPT Female
  • 3/4" NPT Female

Pressure Rating

  • Inches WC: 0 to 30
  • psi: 750 (kPa: 5,171, bar: 51.71)

Documentation

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