Hydac
SB / SBO Pulsation Dampeners

Key Features

  • Reduces flow rate fluctuations from displacement pumps
  • Increases actuation time of shut-off and control valves with short opening and closing times
  • Reduces fluctuations when switching pumps on and off
  • Reduces fluctuations when suddenly linking hydraulic circuits with different pressure levels

Applications

  • Reduce vibrations caused by pipes, valves, couplings, etc. in order to prevent pipe and valve damage
  • Protect measurement instruments and eliminate the impaired performance caused by pulsations
  • Reduce system noise
  • Increase machine performance
  • Allow the connection of multiple pumps to one line
  • Increase the allowable rpm and feed pressure of pumps
  • Reduce system breakdowns and increase the service life of the system

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The pressure fluctuations occurring in hydraulic systems can be periodic or single occurrence problems due to:

  • Flow rate fluctuations from displacement pumps
  • Actuation of shut-off and control valves with short opening and closing times
  • Switching pumps on and off
  • Sudden linking of hydraulic circuits with different pressure levels

Dampeners have two fluid connections for inline mounting. The volume of flow is directed straight at the bladder or diaphragm by diverting it into the fluid valve. This causes direct contact of the fluid flow with the bladder or diaphragm which balances the flow rate fluctuations via the gas volume. It is particularly effective with higher frequency oscillations. The gas precharge pressure is adjusted for the specific systems operating conditions.

Compound Materials

Not all fluids are compatible with every elastomer at all temperatures. Therefore, HYDAC offers the following choice of elastomers:

  • NBR (Standard Nitrile)
  • LT-NBR (Low Temperature Nitrile)
  • ECO (Epichlorohydrin)
  • IIR (Butyl)
  • FPM (Fluoroelastomer)
  • others (available upon request)

Construction

HYDAC pulsation dampeners consist of:

  • The welded or forged pressure vessel in carbon steel; for chemically aggressive fluids they are available in coated carbon steel or stainless steel
  • The special fluid valve with inline connection, which guides the flow into the vessels (threaded or flange connections available)
  • The bladder or diaphragm in various compounds as listed below