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

SIMPLEX PLUNGER PUMPS with PipeHugger HP - PHr's
Application Story

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You chose the EFFICIENCY of - a PACKED PLUNGER PUMP,
You have the least pressure pulsation - from a variable stroke metering pump
(Excluding "lost motion - limited back stroke" machines).
Cool suction flow to prevent vapor lock with jacketed dampers go to jackets

TECH NOTE: It is not necessary to read these highlighted sections
The distance between the end of the plunger stroke, and the cylinder head, plus the volume in the suction and discharge check valve pockets, are together, less than a quarter of the dead volume of a diaphragm head pump, 1/4th the inefficiency of a diaphragm head.
Because of this high efficiency of plunger pumps, the liquid is accelerated progressively, prevents pressure shocks, & provides ides a smoother flow.
An extruder producing foam insulation for pipe cover, needs a constant feed of foaming agent. This is like a refrigerant.
These foaming liquids are highly compressible, and despite the high efficiency of plunger pumps, in general, it is necessary to intercept the decompression shock wave with a "flow through" PipeHugger.
PROBLEM
1) Provide flow thru. In place flushability for extruder flush cycle.
2) Intercept pressure transients @ 1300 Meters/Sec & 180Hz.
3) Reduce the 3 Meter per second flow fluctuation to + - 0.5%
ANSWER
A separate connection, in and out, "flow-through", PipeHugger 70 times the volume of one stroke of the pump, rated at 2250psi (150 Bar) 3/8" pump connection & 1/8" system connection, available off the shelf.
Click on dampers or pump for associated pages
sketch plunger with dampers
photo plunger with dampers
Click on dampers or pump for associated pages

RESULTS
1) The CORIOLIS (vibrating tube) mass transfer meter gives ACCURATE READINGS
Instead of being over excited at its natural frequency of 90 Hz.
2) The ratio of damper inlet hole size to damper internal diameter is in excess to 1:6.
This ratio gives a "discharge coefficient" which in effect KILLS THE PRESSURE PULSE
The residue of the pressure wave is prevented from escaping from the outlet by the even higher "convergence coefficient"
3) The flow fluctuations are stabilized to LESS THAN A 1% FLOW SWING by the accumulation capability of the Nitrogen volume

The right size of pipe, small enough to be "dissipative", does as much to stabilize flow fluctuations, and reduce pressure pulsation, & prevent resonance, as is achieved with "dampers", and smaller pipe costs less.
High Hz. = Comments Liquid Dynamics Intentional by - "Pulse-Doctor" Analytical, Diagnostic and Software services
Dampers that do, flow goes through, Pressure problems do not.
First address the suction system, no pump can give you smooth flow unless it can fill properly

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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.