PulseGuard UK Ltd.

Pump Pulsation Dampers / Dampening by PulseGuard UK

Pump Pulsation Dampers


0161 480 9625 - PulseGuard / Liquid Dynamics Spares and Service


Where does Pulsation
come from ?

What is a Pulsation
Damper ?

Why is a Pulsation
Damper necessary ?

What info to collect
for selecting a pulse
Damper ?

Where is a Pulse
Dampener intalled ?

Why are there
different types of
Pulsation Dampner ?

What are the normal
quality controls on a
Pulsation Dampener ?

What are the "pre-charge" needs for a Bladder or Diaphragm type pulsation dampener ?

How do pulsation dampers work - animations ?

Why Nitrogen ?

Are there "bladderless no moving part" Pulsation Dampers ?

The major application requirements for applying the above "service free" acoustic pulse Dampers ?


Pulsation Dampers for Flow and Pressure by PulseGuard Choose navigation by words.

Pulsation Damper Selection by damper features for hose pumps, or liquid in bladder for metering, with teflon ptfe diaphragm, even gas bag "bladders" in stainless dampers shells (1).

Pressure Pulsation Dampers from PulseGuard Limited - The Smooth Flow People Choose navigation by icons.

Six types of pump pulsation dampers for acoustic pulse interception for selection by icon button, and five dampener types with bladders, diaphragms, and flexing tubes for selection by icon button (2).

Waveguard Pulsation Dampers Without Moving Parts PulseGuard Pulsation Dampers
PulseGuard Pulsation Dampers Choose navigation by damper or traditional drawings.

Pulsation Damper Drawings of all pump pulsation dampener types for engineers who have a particular damper design preference (3).

Pulsation Dampener Selection



Contact LDi/PulseGuard

PulseGuard China

Pressure Pulsation

Choose to CONTACT us.

International Telephone:
--44 (0) 161-480-9625
International Facsimile:
--44 (0) 161-480-9627

UK Freephone:
08080 LO PRICE (56 77423)

Flow Control / Pressure Dampeners - Why a "pressure damper"? Because pressure dampers are used to dampen pulsation. Pulsation is measured and seen as a repeated chenge in pressure. Pressure pulastion dampers adress pressure amplitude at frequency. The characteristics of a pulsation damper have to be designed to respond to the height and fall of pressure at the frequency of the change. A flow through, in and out, pressure damper intercepts the pressure transients so it can respond to its dampening with maximum efficiency and minimum cost.

Flow fluctuation suppression devices aka for "pulsing systems" may be called reactive or non-reactive passive in pressure response. Intrinsically when a proportion of head change due to mass acceleration is prevented from occurring by the application of the softness, or cushion, of a liquid accumulator there is still a residual fluctuation. The head change or pressure change that is still residual travels at 1400 meters per second away from the pump, until it meets a point of reflection. Where the distance to the reflection point is say 700 meters, the wave will return in 1 second. This pressure spike (liquid force) will impose a system response frequency of one hertz on the piping. To also address transient and spikes as detailed above, along with the softening effect of accumulators a PulseGuard dual purpose design will be essential to your satisfaction.


(1) Pulsation dampeners for peristaltic and hose pumps handle sludge and slurry with a tubular bladder, straight trough flow flow ensures no blockage from solid particulate.
Liquid inside the bladder chemical metering compatibility saves the need for special metal dampner body materials.
PTFE diaphragm dampeners match high pressure diaphragm pumps, with double layer "sandwich" diaphragms , and secondary containment sealing options.
Stainless housings containing gas "bladders" for dampening pressures and flows through 30.000 psi (2000 bar)

(2) Pulsation dampening choice made easy to select from by icon buttons . Covering maintenance free "bladderless" dampers of 6 types depending on frequency and pressure amplitude reduction required.
Flexible membrane damping for volumetric flow smoothing in hydrocarbon, toxic chemical, and water based systems. Choose by seeing them working in animation.

(3) Enabling dampener selections and choices without the need to understand English. Cut section views all dampers showing internal bladder, diaphragm etc, moving parts . Top left - All in line flow through mounting option piping bases. Aninations of all normal damper install methods are shown. Providing pressure pulse interception and in place flushing ability. Top right shows assembly and reassembly of each pulsation damper in sequence


No Moving Parts Damper System

Diaphragm Head API 674 Pump With Pulsation Dampers

Simplex, Duplex, and Triplex Pump Dampers
Triplex Motion and Pressure Including Velocity Jump Shock

Pulsation Dampers for 50 Years

PulseGuard Pump Pulsation Dampers PulseGuard Pulsation Dampeners PulseGuard Ltd. Pulsation Dampers Dampners from stock, for United Kingdom - Europe - and Asia

LDi Science  Valid XHTML 1.0 Valid CSS Level 3 PulseGuard UK Ltd.

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Pumpguard Pulsation Dampers with Flow-Through Flex-Tube Flexorber Low Pressure Diaphragm Pulsation Dampers Flexorber High Pressure Diaphragm Pulsation Dampers Pipeguard Pulsation Dampers with Gas in the Bladder Pipehugger Pulsation Dampers with Liquid in the Bladder BLADDERLESS, No moving parts pump pulsation dampers. A WaveGuard Pulse Damper works by accelerating the pressure wave and exploading it into a large volume of only slightly compressible liquid. THE WAVEGUARD PulseGuard A "triplex" PUMP makes 6 pulsations per revolution. The CAVGUARD by PulseGuard A CavGuard prevents cavitation by temporarily generating bubbles. Elasticity of the bubbles provides storage volume to fill the intermittent "suction" strokes of the pump. Centrifugal pump provides 110% continuous flow. Incomplete filling of the "suction" strokes of "reciprocating" pumps is the cause of elevated discharge PRESSURE PULSATION. FLEXORBER by PulseGuard A Pump Pulsation Damper on the pump suction to prevent gas bubble generation, and fall in pumping volumetric efficiency, and the discharge "header" to intercept "velocity jump shock" will not only make the systems controllable, but also make it possible to increase pump RPM producing higher flow from the same investment with longer life and less "down time". A "triplex" PUMP makes 6 pulsations per revolution. The gear box drive to each diaphragm pump head connects to the next by a shaft offset of 120 degrees. NOVO-MULTIPLEX-HP Process Metering Modular pumpe Many resonant frequencies will need interception by "Flow-Through" Dampers to guarantee pumping performance. FLEXORBER by PulseGuard Liquid Dynamics International Ltd. Compare Simplex, Duplex, Triplex and matching dampers. Note :- "liquid only" filled dampers may be 600 times these sizes. ALL GRAPHICS ARE TO THE SAME SCALE TRIPLEX PUMP FLOW FLUCTUATION 1 Liter Triplex Pump PLUNGER DIAMETER 10mm PLUNGER STROKE 2025mm VOLUME PER PLUNGER PER STROKE 1589 cm3 CRANKSHAFT RPM 210 FLOW RATE 1 Liter/Minute (60 in3) See Animation: 1 Litre/Minute Triplex See Also: Triplex Motion LDi DUPLEX PUMP FLOW FLUCTUATION 1 Liter Duplex Pump PLUNGER DIAMETER 12.25mm PLUNGER STROKE 2.025mm VOLUME PER PLUNGER PER STROKE 2.386641 cm3 CRANKSHAFT RPM 210 FLOW RATE 1 Litre/Minute (60 in3) See Animation: 1 Litre/Minute Duplex Note: Pressure pulsation is a square law to flow fluctuation SIMPLEX PUMP FLOW FLUCTUATION High Pressure Pulsation DISCHARGE FLOW VELOCITY ZERO FLOW ACCUMULATE TO FILL HERE 1 Liter Simplex Pump See Animation: 1 Liter Simplex Pump PLUNGER DIAMETER 17.33mm PLUNGER STROKE 2.025mm VOLUME PER PLUNGER PER STROKE 4.777 cm3 CRANKSHAFT RPM 210 FLOW RATE 1 Liter/Minute (60 in3) Pulsation Dampers: Allow for "Overlap" of One Displacement to the Next ROLLING DIAPHRAGM TYPE PULSATION DAMPENERS PG Size"1" VOL 1 Cost Factor 750 "ELASTIC DAMPER" PG Size "3" VOL 8 Cost Factor 3000 "ELASTIC" DAMPER ROLLING DIAPHRAGM PG Size "11" VOL 27 Cost Factor 8500 "ELASTIC DAMPER" THEORETICAL vs ACTUAL TRIPLEX CHARACTERISTICS VOLUME AND MASS FLOW FLUCTUATION TRIPLEX RECIPROCATION PLUNGER AND PISTON PUMP MOTION WHEN DISPLACERS PHASED AT 120 DEGREES THEORETICAL FLOW VELOCITY CHANGE WHEN CONNECTION ROD IS 4 x CRANKSHAFT RADIUS DEGREES OF ROTATION SUCTION DISCHARGE IT IS RARELY MORE THAN 16% OF THE FLOW THAT HAS TO RECIPROCATE IN AND OUT OF A DAMPER THEREFORE IF THE VISCOSITY, AND THE SPECIFIC GRAVITY ARE LOW THEN A SINGLE CONNECTION DAMPER CAN BE DEPLOYED. Please refer to the factory for selection. Piston "A" Piston "B" Piston "C" Discharge THERE ARE 6 PULSES PER REVOLUTION BECAUSE OF THE 60 DEGREE OVERLAP Pump oscillograph type plots generally represent FLOW. The relationship between flow and pressure is a square law. Pressure plots are therefore more "exagerated". Damper "before and after" plots often do not come from data capture at KHz. PRESSURE PULSATION VELOCITY JUMP SHOCK VELOCITY JUMP SHOCK PEAK PRESSURE depends on tha amount of lost motion caused by fluid compressibility and volumetric efficiency. THEORETICAL PRESSURE CHANGE WHEN CONNECTION ROD IS 4 x CRANKSHAFT RADIUS ACTUAL NORMAL PRESSURE CHANGE BECAUSE LIQUIDS ARE COMPRESSIBLE CAUSING A FALL IN VOLUMETRIC EFFICIENCY DISCHARGE PRESSURE DISCHARGE PRESSURE Pulsation Dampers: Allow for Overlap of One Displacement to the Next To intercept transient pressure spikes at x y and z a "flow through" damper WILL BE ESSENTIAL. Liquid Dynamics International Ltd.