Pulsation Dampeners, Surge Suppressors and Pump Inlet Stabilisers

Google Search Our Web Site:


H2O Rx's Blacoh Pulsation Dampeners, Surge Suppressors and Pump Inlet Stabilisers protect pumps, pipes and sensitive instruments from damage. These are hydraulic shock absorbers. Hydraulic shock is caused by rapid acceleration or deceleration of the liquid.

For more information, click on the boxes below!


Pulsation Dampeners and Surge Suppressors

The metering of fluids is critical in maintaining control of quality and material usage. A SENTRY PULSATION DAMPENER installed at the discharge of a reciprocating pump eliminates the pulsating flow, allowing the meter to respond to a steady flow, insuring its accuracy, protection and longevity.

Pulsation Dampeners and Surge Suppressors

Quick closing valves create dangerous pressure surges during operation. When fluid velocity is stopped, it is transformed into pressure energy, causing a pressure spike up to six times greater than operating pressure - valves are destroyed, piping is ruptured, and sensitive instrumentation is damaged. A SENTRY SURGE SUPPRESSOR, placed upstream as close to the valve as possible, will absorb dangerous pressure spikes.

Pulsation Dampeners and Surge Suppressors

Filter screens are susceptible to breakdown due to fatigue and "stretching" from pulsations. Pulsating fluids will loosen and eventually tear apart filter media. In addition, pulsating pressure spikes will enlarge the flow holes in the media and allow larger than acceptable particles to pass. A SENTRY PULSATION DAMPENER placed at the pump discharge will create a steady pressure and constant flow against the filter media to ensure longer media life and particle size integrity.

Pulsation Dampeners and Surge Suppressors

At pump start up, the fluid in a pipeline must be accelerated from zero to operating velocity. When the initial pump surge comes into contact with the static line fluid, pressure spike is created. The force of this "water hammer" will rupture pipes, break pipe fittings and destroy instrumentation. A SENTRY SURGE SUPPRESSOR installed at the pump discharge will absorb the initial fluid surge, then discharge the accumulated fluid as the pipeline achieves a steady flow.

Pulsation Dampeners and Surge Suppressors

Suction stabilization is critical to a pump's efficiency and in preventing cavitation. Cavitation will result in premature failure of pump components including seals, packing, plungers and diaphragms. A SENTRY SUCTION STABILIZER installed at the pump inlet will control the pressure fluctuations and acceleration loss which lead to cavitation. With a suction stabilizer, the pump will always have a full volume stroke.

Pulsation Dampeners and Surge Suppressors

Coating, spraying and curtain coating applications benefit with the addition of a SENTRY PULSATION DAMPENER placed directly at the discharge of a reciprocating pump. A pulsating pump creates an uneven fluid flow to the coating or spraying process. The uneven application of material can result in rejected product and overuse of coating materials, both resulting in lost profits.

Pulsation Dampeners and Surge Suppressors

Back surge occurs when a pump is required to pump vertically or over a rise. At pump shut down, the fluid reverses directions and gains velocity as it travels back toward the pump. As it hits the pump or the pump's check valve, the fluid is stopped and a dangerous pressure spike is created. A SENTRY SURGE SUPPRESSOR placed at the pump's discharge or check valve absorbs the pressure shock, saving the system from damage.

Pulsation Dampeners and Surge Suppressors

Thermal expansion of fluids in a closed system can result in dangerously high pressures, which lead to ruptured pipes and fittings, destroyed in-line instrumentation, burst pressure relief valves and contaminated surroundings. A SENTRY THERMAL EXPANSION CHAMBER placed in line will accumulate the expanded fluid, reducing the increase in pressure.


Download the above table as a flyer - Click Here.



Each application requires a different sizing formula. For your ease of reference we have provided a metric units sizing spreadsheet.

A spreadsheet to size dampeners can be downloaded here!

Frequently Asked Questions

Do Pulsation Dampeners comply with AS1210 - Pressure vessels?

AS1210-2010, Clause 1.3 Application says....

"This standard is not intended to apply to"........"and other plant under pressure excluded by AS/NZS1200."

AS1200-2000, Appendix A3 Equipment or plant under pressure not specifically covered in Item 15 says....

"Hydraulic actuated equipment, including inert gas type 'dampers' in which the product of pressure (MPa) an gas volume (L) does not exceed 30 MPa.L."

So the answer is that the majority of pulsation dampeners do not have to comply with AS1210 as they are excluded from the scope.

Do Pulsation Dampeners comply with ASME VIII?

In most cases pulsations dampeners do not need to comply with ASME VIII due to the size and scope. Blacoh does however design to the intent of the ASME VIII standard, even though it is not required. Download the explanation from Blacoh Engineering here.

What is the best way to support a Blacoh pulsation dampener?

Smaller dampeners can be supported by the piping without difficulty. Larger dampeners should be supported to prevent loads on the piping. H2O Rx can provide a support plate to simplify this. Download the datasheet for the support plate here.

Can I get a CAD model of a dampener for my skid layouts?

Yes! Just ask H2O Rx!

Operation and Maintenance Manuals and Drawings

Operation and Maintenance manuals are shipped with each dampener. If you need electronic copies, email us with the model number so that we can supply the correct document.

H2O Rx can even provide you with dimensioned drawings if you require.


Local Expertise

Scott Young's Certificate of Achievement (Distributor) at Blacoh University

Scott Young's Certificate of Achievement (Engineering - Energy Efficiency) at Blacoh University

Scott Young's Certificate of Achievement (Engineering - Acceleration Head) at Blacoh University


Additional Resources


Get from your DVD or Intranet

(requires "offline" version of our website)

Get it from the Clouds

(requires internet connection)

How to properly charge a Pulsation Dampener - Introduction    
How to properly charge a Chargable Dampener    
How to properly charge an Adjustable Dampener    
How to properly charge an Automatic Dampener    
How to properly charge an Inlet Stabiliser    
Dampening for Metering Pumps? Watch the video! Metering Pumps
Dampening for Peristaltic and Hose Pumps? Watch the video! Peristaltic Pumps
Dampening for Air Diaphragm Pumps? Watch the video! Diaphragm Pumps
Pump Inlet Stabilising? Watch the video! Inlet Stabilisers
Dampener Control Types. The video explains. Control Types
Slurry Applications with AODD's- See the video. Slurries with AODD's
Slurry Applications with Peristaltic Pumps- See the video. Slurries - With Peristaltics
Water Hammer Control. The video explains. Water Hammer
Spraying and Coating Applications? Watch the video! Spraying and Coating
High Pressure Applications? Watch the video! High Pressure
Sanitary Applications. See the video. Sanitary  

To request a DVD, click here.

H2O Rx
PO Box 748
Lane Cove NSW 1595


+61 409 784 236
+61 2 9436 0491
97 217 924 685


Last Updated: 26 March, 2018