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Typical disadvantages of diaphragm actuator

asked Sep 5, 2014 in Process by rajprasad (870 points)

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answered Sep 6, 2014 by ChemKB (8,210 points)
  • A large proportion of available thrust is used to overcome the spring force
  • Linear design actuators can create hight issues for smaller valves in restricted location and for large valves casing can be excessive in weight.
  • Not quite linear characteristic
  • Lack of stiffness : hysteresis due to diaphragm stiffness, typically 3% 9 air permeates through diaphragm and is lost
  • Position holding is quite flexible due to the volume of air in the diaphragm case and the compressibility of air
  • Diaphragm can fatigue due to flexing

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