[LDi] Liquid Dynamics International Liquid Dynamics International Inc. Click here to: Contact Liquid Dynamics Liquid Dynamics offers pulsation, vibration, and shock analysis, diagnostics, and software models. Fluid Flow Control Animations

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6 examples

Gear & Packed Plunger Systems

Dosing, Air Op. &"Metering" Systems

Plunger & Valve Motions

Multi Plunger & Centrifugal Systems

Acceptable Maximums


LDi Catalog Printable PDF16

LDi Pulsation Analysis - target image Ultra stable circuits with gear pump. Typical packed plunger systems.

Gear Metering smooth systems
Gear / Smooth Systems

Packed Plunger shockless systems
Packed Plunger Shockless Systems


"Totally" smooth gear pump metering systems
Pressure feed to Gear Meter
Before Bottle installation
Discharge From Gear Meter
Before Bottle installation
Pressure feed to Gear Meter
After Bottle Installation
Discharge From Gear Meter
After Bottle Installation
Pressure feed to gear meter before bottle installation.
Discharge From Gear Meter Before Bottle Installation
Pressure Feed to Gear MEter After Bottle Installation
After Bottle Install
You are examining to find fluctuations as small as part of 1psi in several thousand (see last frequency)

Minimum dead volume, packed plunger pump systems
Packed Plunger System


Example: high viscosity resin/polymer hot oil jacket Jacketed double layer diaphragm feed pump creates flow fluctuations Heating circuit pump Example: 23 tooth gear pump, minimum chance of resonance Constant supply in – low ripple out Lifts pressure from 50 Bar to 100 Bar and provides precise flow within 0.5% All ripple has gone Metal bellows type, liquid expansion and contraction volume compensator for temperature change in closed loop circuit Spinnerette heads 0.1% DQ Denier checked by laser beam precisely Web coating For sealed systems the diaphragm seal is behind the packing RV and flow controllers are liable to make more pressure pulsation than a packed plunger pump Pump stroke Acoustics left in pipe Pump stroke Return Heat exchanger Filter strainer Supply Packed plunger pumps provide high volumetric efficiency almost no velocity jump shock free injection systems with high pressure capability


Pulsation Dampeners at Fluid Flow Control

Fluid Flow Control