Type 29 Welded, High Volumetric Displacement Diaphragm Seals

Key Features

  • An off-line seal with a threaded connection and all welded, all metallic housing design that does not utilize an o-ring or gasket
  • Designed with a larger diameter diaphragm for higher displacement capability
  • Maximum pressure rating is 2,500 psi
  • A variety of upper and lower housing and diaphragm materials are available 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
2-1/2", 4" and 4-1/2"
Will also operate with most transducers, transmitters and pressure switches
Minimum span pressure 30 psig
Maximum working pressure 2,500 psig
Operating temperature Refer to fill fluid expansion factors table