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A diaphragm seal is a flexible membrane that seals and isolates an enclosure. The flexible nature of this seal allows pressure effects to cross the barrier but not the material being contained.Diaphragm seals (also known as chemical seals or gauge guards) are also used to protect a process fluid from the pressure sensor. Examples of this use are:

  • Sanitary processes (food, pharmaceuticals, etc.) where allowing process fluid to accumulate in the pressure port of the sensor would compromise the purity of the fluid (such as milk getting into the pressure port of a pressure gauge and spoiling)
  • Very pure process fluids, where the metal surface of the pressure sensor might contaminate the fluid (such as copper ions from brass leaching into ultra pure water.)
  • Pneumatic systems where small changes in pressures must be eliminated, such as those controlling air bearings.

Actuator for PCV

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  • Diaphragm seals (also known as chemical seals or gauge guards) are also used to protect a process fluid from the pressure sensor. Examples of this use are:

    • Sanitary processes (food, pharmaceuticals, etc.) where allowing process fluid to accumulate in the pressure port of the sensor would compromise the purity of the fluid (such as milk getting into the pressure port of a pressure gauge and spoiling)
    • Very pure process fluids, where the metal surface of the pressure sensor might contaminate the fluid (such as copper ions from brass leaching into ultra pure water.)
    • Pneumatic systems where small changes in pressures must be eliminated, such as those controlling air bearings.
  • As like as the following picture , first ,you should bring the defective diaphragm out  by opening the bolts of actuator (no.2) and then opening the bolt (no. 3). Secondly , replace new diaphragm on its position. Attention to that , the new diaphragm is installed according to the picture (in way that its writing stand at the top of actuator) otherwise , new diaphragm may damage again.   

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