It can be very expensive to confuse  Delta Flow VS Delta Pressure
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1. Flow:
Volume over Time
Gallons per seconds
Liters per seconds
Even mass Velocity:
Pounds per second
"Kilos" per Second
2. 
Flow Fluctuation
is expressed in %age +&- variation on average velocity
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IS not
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Therefore
Can not be
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Pressure:
Force: Mass on Area
Pounds per square inch.
Kilograms / sq. centimeter
Mass on area:
Pounds / in2 "PSI"
Kg Cm2 (approx. = "Bar")
Pressure Pulsation
expressed as amplitude at frequency
+&- PSI / cyclec/sec or Bar @ Hz.
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First consider flow & pressure in the same terms.
VELOCITY, - distance over time.
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3. Mass of liquid in a pipe is transferred at not above 180 inches/sec or say 460 cm/sec
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Pressure in a fluid travels at, Mach 1 (in Air)
In harder substances (liquid) is transferred at up to 4000 MPH, or say 140,000 cm/sec.
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"Flow is 300 times slower than pressure".
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So there is time to flow up, stop, turn around, and flow back out again.
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On the other hand, what ever the residual pressure pulsation is will flu straight past a "T" in a split thousandth of a second.
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CONCLUSION:- With 300% greater efficiency, because flow and pressure pass through a PULSEGUARD DAMPER you have increased performance at lower cost.
Dampeners that do, flow goes through, but pressure pulsation does not.
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