Waveguard (continued from page one)

The WAVEGUARD APPROACH TO DAMPENING
Relative costs: With Solid state, no moving parts, "acoustic" "reactive" - pulsation dampers
PULSATION DAMPER DEVELOPMENT a little more of the "Science".

If you make a pressure by for example striking a pipe with a hammer. If you isolate the pipe its self from transmitting the shock,
you will be able to measure thet pressure spike a mile away one second later (always assuming you have a transducer of
sufficiently fast response characteristics, and data capture at khz)

From the first paragraph, it follows that the compressability figures for each liquid at pumping temperature and pumping
pressure, must be known - otherwise it will not be possible to properly select the volume of a "Damper" to produce a
required level of pressure smoothness relative to the volumetric performance of a positive displacement pump.

1, 2, 3, 4 & 5 please refer to prior page.

 

 

We can try to simlify the selection of suitable volume bottles by saying - 1 divided by 0.00005 = 20,000, So we find that we
can absorbe a ml or (1cm3) or centimeter cubic - or "cc" of cold water in 20,000 ml (or 20 Litres) by 1 bar pressure increase.

NOTE:
Unfotunately the higher the pressure at which the water is, the more dense the water has become, so the volume necessary
for the "volume bottle" pulse absorber will have to be increased still further.
BUT conversely the higher the temperature of the liquid the lower its density - usually given in grams per cc. SO the
compessibility rises with temperature. Making the huge volume otherwise necessary SMALLER.

THEREFORE
The rise and cost of a "volume bottle" to supress VOLUME TRIC PULSATION coming from a positive displacement pump is
absolutely dependent on the liquid compressibility AT TEMPERATURE AND PUMPING PRESSURE.

So THREE EXAMPLES:
A 1 ml pulse would need 20,000 ml to compress to reduce to a 1bar pulse 20 Liters.
A 15 ml pulse would need 300,000 ml to compress to reduce to a 1 bar pulse 300 Liters
A 50 ml pulse needs 1 million ml to compress to reduce to 1 bar pulse 1000 Liters

Applications:

  • When no moving parts is required.
  • For use as an acoustic filter.
  • Dampers for diffusion.
  • As an acoustic silencer.
  • Helmholtz resonators.
  • As dissipative dampeners.
  • As an orifice damper.
  • For pressure wave dispersion.
  • Used as a resonator.
  • When solid state is required.
  • As reactive dampners.
  • As a pulse absorber.
  • For high frequency and low amplitude.
  • When maintenance free is preferred.
  • When bladderless is specified.
  • When no elastomers or plastomers are needed.
  • If no foam is specified.
  • When flow through is preferred.
  • For hydraulic noise reduction.
  • To hold pulsations constant over broad pressure range.

 

PulseGuard - Guarding Against Pulsation


PulseGuard Pulsation Dampers
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Free Phone: 08080 LO-PRICE (56-77423)
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