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The Ashcroft® 740 and 741 high-displacement diaphragm seals are used with low-ranged instruments or high static pressure differential pressure gauges with low differential pressure. Used to ensure material compatibility, they are also applied when process media exhibit pulsation or the potential to clog an instrument connection. An ideal product for satisfying low pressure measurement needs.
740 and 741 High-Displacement Diaphragm Seals
Unit of Measure
Items 740 and 741 High-Displacement Diaphragm Seals
740
740 Threaded High-Displacement Diaphragm Seal 		740 and 741 High-Displacement Diaphragm Seals
741
741 Threaded High-Displacement Diaphragm Seal with Flushing Port
Description N/A The Ashcroft® 740 high-displacement diaphragm seals are used with low-ranged instruments or high static pressure differential pressure gauges with low differential pressure. Used to ensure material compatibility, they are also applied when process media exhibit pulsation or the potential to clog an instrument connection. An ideal product for satisfying low pressure measurement needs. N/A The Ashcroft® 741 high-displacement diaphragm seals are used with low-ranged instruments or high static pressure differential pressure gauges with low differential pressure. Used to ensure material compatibility, they are also applied when process media exhibit pulsation or the potential to clog an instrument connection. An ideal product for satisfying low pressure measurement needs.
Brands N/A Ashcroft®
Process Connection Size (National Pipe Thread (NPT) Female) N/A 1/4 in1/2 in3/4 in1 in
Instrument Connection Size N/A 1/2 in1/4 in
Instrument Connection Type N/A National Pipe Thread (NPT) Female
Pressure Rating N/A Up to 750 psi
Typical Added Tolerance (±) N/A 0.5 %
Connection Style N/A Threaded N/A Threaded with Flushing Port
Key Features N/A
  • Wide selection of diaphragm and lower housing materials
  • Enlarged welded diaphragm; high displacement allows high sensitivity to pressure fluctuations
 		N/A
  • Wide selection of diaphragm and lower housing materials
  • Enlarged welded diaphragm; high displacement allows high sensitivity to pressure fluctuations
  • Flush port provides easy cleaning/flushing for process media prone to clogging
Applications N/A 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