PulseGuard Ltd. and Inc.
PulseGuard Ltd. offers pulsation dampers | Please phone 44(0) 161-480-9625
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Fluid Flow Control Animations
Fluid Flow Control Animations

Low Volumetric Efficiency, or lost motion - &
- Pumping with a Velocity Jump. "The Joukowski Shock"

Diaphragm metering pumps with LP an dHP Flexorbers cross sectional detailed view

When the beginning of the forward stroke does not displace any liquid, a pressure shock is emitted, instead of a flow surge.
The shock is caused by the acceleration away from "bottom dead center" before it hits solid liquid.
This acceleration without pumping liquid is caused in 3 ways:
1. Expansion of compressible liquid left form he last discharge stroke, stopping the pump filling properly on its suction stroke.
2. Volume control by limiting back stroke, as in some cam drives.
3. Instant action as from a solenoid drive.
The shock from all three occurs too fast, for an off line flow smoother to catch.
These shocks are bad for all forms of instrumentation, and usually cause pipe shake as well.
An in line through flow damper is needed to intercept the shocks.

Return to Smoothness Level to smoothness level

Return to the beginning of PulseGuard, pulsation dampeners

Selecting Pulsation Dampeners for Different Pump Systems.
Flow through pulsation dampers are at least 3 times more efficient than T off line accumulators.
Dampeners that do, flow goes through, but pressure pulsation does not.
PulseGuard Pulsation DampersThe Smooth Flow People

Call Toll Free 1-888-DAMPERS (326-7377) / See also: Pulsation-Dampeners.com for a pulsation dampener.

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