Type 25 Welded, Standard Pressure Diaphragm Seals

Key Features

  • Designed to isolate the pressure measuring instrument from corrosive or viscous 
    process media
  • Utilize an all welded, all metallic housing design to eliminate potential leak paths
  • For use with gauges with dial sizes of 2-1/2" and smaller, and pressure ranges no
    less than 100 psig
  • Housing and diaphragm offered in a variety of materials to suit most applications
  • A flushing port is available to clean wetted areas and prevent process media build up
  • Consider gauge size, pressure range, media composition, ambient and operating
    temperature, and maximum working pressure when selecting
  • For process temperatures over 212 °F a capillary or cooling element is recommended, 
    contact factory to order
  • Fill fluid must be compatible with process media; i.e. glycerine may become volatile
    in conjunction with a strong oxidizing agent such as chlorine, forms of oxygen or peroxide
    and nitric acids 
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Suitable pressure
gauge sizes
Will also operate with most transducers, transmitters and pressure switches
Minimum span
25: 100 psig
25H: 100 psig
Maximum working
25: 2,500 psig
25H: 5,000 psig
Operating temperature Refer to fill fluid expansion factors table