Ashcroft 702-703 Flanged High Displacement Diaphragm Seals

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.

Key Features:

  • Wide selection of diaphragm and lower housing materials
  • Enlarged welded diaphragm; high displacement allows high sensitivity to pressure fluctuations
  • Flushing port (type 703) provides easy cleaning / flushing due to process media prone to clogging


  • Style:
    Type 702: raised face flange
    Type 703: raised face flange with flushing port
  • Process size: 1/2" to 3"
  • Flange rating: 150 and 300 class

The 702 and 703 diaphragm seals are ideal where low volume measurement and process protection are essential:

Process Market:

  • Oil and Gas
  • Refineries
  • Chemical and Petrochemical
  • Water and Wastewater                                        

Process Applications:

  • Oil and Gas Racking
  • NACE Compliant Processes (Sour Gas Separation)
  • Bioassay and Biocides

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