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Pulsation Dampeners

Pulsation dampeners stabilise changes in the pumped liquid flow rate through diaphragm pumps. Their main job is to ensure that there is a constant volume of liquid flowing through the pump during each revolution. This device is essentially an accumulator that has a pre-set charge. This can absorb all types of system shocks, whether they are caused by vibration, pressure fluctuations or water hammering. Once pulsations are minimised, other pump components such as sensors and regulators are subject to decreased wear and tear and so have a longer operational lifetime.

The pulsation dampener works by creating a cushion of air as the liquid pressure pushes the diaphragm upwards. Air enters the chamber of the pump while balance from the air cushion ensures that the diaphragm remains centred. When the system pressure changes, the air cushion compensates by either decreasing or increasing the pressure. Pulsation dampeners are installed downstream of the pump. They can be made from a variety of materials:

  • • Nitrile which is resistant to most solvents, oils, and hydraulic fluids. This works in the optimal temperature range of 10 to 60 degrees C.
  • • EPDM which has good resistance to chemicals and water but is poor for oil and organic solvents. It works over an optimal temperature range of 10 to 100 degrees C.
  • • Neoprene - an all purpose material that is resistant to vegetable oils, moderate chemicals, greases, fats, oils and solvents. However, it can be attacked by strong acids and nitro and aromatic hydrocarbons
  • • PTFE which is virtually impervious and almost chemically inert. The exceptions are gaseous fluorine and some fluoro chemicals. This material operates within an optimal temperature range of 10 to 100 degrees C.
  • • Santoprene which has excellent abrasion resistance and operates between 10 and 100 degrees C.
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