Ashcroft 500-501 All-Welded Diaphragm Seals

The Ashcroft® 500 and 501 all-welded diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal selection for applications needing added product integrity.

Key Features:

  • Recommended where clamped joints are not acceptable
  • All-welded construction; prevents inadvertent disassembly
  • All-stainless steel construction; other materials available
  • Flush port (type 501) provides easy cleaning / flushing due to process
    media prone to clogging


  • Style:
    Type 500: threaded
    Type 501: threaded with flushing port
  • Process size:
    Type 500: 1/4" to 1" NPT female; 1/4" to 3/4" NPT male
    Type 501: 1/4" to 1" NPT female
  • Rated up to 500 psi

The 500 and 501 all-welded diaphragm seals are ideal where fugitive emission and hazardous process protection are essential:

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

Please Contact Us for more detail