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Low vs high pressure portable extraction machines

Pump Pressure

Low vs high pressure portable extraction machines

Low vs High pressure portable extraction machines. 

The myth around high pressure on portable extraction machines. We recently ran a test to measure the true pressure at the tool end on a high pressure portable against our digitally controlled machine. Find out more below.

We ran the test, fairly using the same rig, gauges, hose and wand on both machines. The test was all about demonstrating adaptability and control delivering better performance.

We keep hearing how we need ever higher pressure pumps and manufacturers are selling machines extolling the virtues of how powerful their pumps are. In principle If our smaller controlled pump could deliver higher pressures through 2 x 03 jets, the higher pressure pumps should have in theory also been easily able to cope with 03 jets.

Reducing the flow through 2 x 02 jets now means that you have reduced your potential flow by 33% The fixed jet size governs how much fluid can pass through it and once maximum flow through the jet has been achieved, the only thing that can be altered then is the velocity at which the fluid passes through the jet. During years of research, development and testing of our control system, we found that restricting flow by reducing the jet size not only delivered far less volume of fluid due to the jets smaller size but also created a finer mist spray created by forcing the fluid through the smaller jet at higher velocity.

Whilst developing our machine we spoke with three of the world’s largest pump manufacturers and they all said the same thing. Dependant on application, pumps are designed to give a maximum flow at a set speed and pressure. You must balance flow with pressure to optimize a pumps performance and output. There are only two ways this can be done, you either allow the pump to run open flow without any impediments e.g. restricted flow due to jets or a reduced hose bore etc, this would then allow the pump to run at its optimum performance as designed by the manufacturer.

When we take a manufacturers pump and introduce variables like jets, wands and hoses etc we are introducing variables that effect and inhibit the pumps ability to run at its designed optimum performance.

The only other way to get over this would be to design a true variable control system that alters the speed of the pump and balances flow with pressure to achieve optimum balanced pump performance for each individual pressure set. This is what we have developed with our machine. We optimise the pumps performance by controlling the pumps speed whilst balancing the flow with pressure.

We all understand that the purpose of an extraction machine is to rinse the cleaning fluid and suspended encapsulated soil out of the carpet and recover it back to the machine. Reducing the jet size and applying excessive pressures only creates finer water particles hitting the fibre and less volume of rinsing fluid penetrating the fibre. We are trying to rinse the carpet at higher flows but constant lower pressures. With our variable digital controls we do not need excessive pressure to compensate for long hoses or lift issues created when cleaning at height.

For example even if I could fit a 800psi pump I would need to increase my jet sizes substantially to take advantage of it and I would be emptying my solution tank every few minutes. For e.g. if I fitted larger jets and ran our pump at its manufacturers optimum delivery of 6 litres per minute we would empty a 30 litre tank in 5 minutes.

For more information please see our video.

1 Comment
  • mark mullane
    27/09/2017

    Thank you for your response. The video was put together to demonstrate why cleaning machines in our industry are constantly failing due to excessive back pressures and restricted flows causing premature pump failures. The trend with some manufacturers in our industry is to fit excessively high pressure pumps, some of these are as high as 800 – 1000 psi. They do this to get over pump lift problems when cleaning at height and with extra long hoses. They are using the same tools with fixed tee jets [ either 11002/03 ] as there competitors so the potential volume of water through the jets would be the same. All they are creating is excessive back pressure which puts the pump under excessive tolerances reducing the pump life and creating a scenario where the pump could prematurely fail. Regards Mark Mullane

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