Part 2 / Low vs High pressure portable extraction machines

The second part of our experiment to establish true flow and pressure at the tool end on portable extraction machines fitted with Low and High pressure pumps.

When I was out earning a living professionally cleaning carpets and upholstery in the 90s I ran several different portable extraction machines. These machines were adequate and allowed me to overall achieve great results. Where I became frustrated was when I was trying to rinse out heavily soiled commercial carpets.

I’m sure we have all be there at one stage where we have been asked to clean a hotel, restaurant or pub fitted with a quality commercial grade wool carpet. These carpets heavy wool content act like sponges and will absorb vast amounts of liquid. Some of the most challenging cleans we used to face were the pubs where no maintenance on the carpets had been carried out for years. Over the years the carpet had absorbed all the food and drinks spills and then when it couldn’t absorb any more the dreaded black top appeared on the surface of the carpet. In the severe cases this black top increased in depth as more and more layers of drink spills and beer sugars formed.

After applying our cleaning agents to the carpet followed by agitation, we would break up the soil encapsulating it with the cleaning fluid and suspend it in the fibre. So far so good, but it was the next part of the process that I became frustrated with. We would then using our wand go to extract the cleaning fluid and suspended soil out with a stabilising rinse agent. We found that because of the absorbency of the heavy wool content we would sometimes have to make several passes with the wand over the same area before we had applied enough rinse to ensure all the cleaning agent and soil had been completely rinsed out. With the portables we were using we just couldn’t get enough flow and apply enough rinsing fluid into the carpet to rinse out in one pass.

The second part of our video explores what happens with pressure and flows when we increase and decrease jet sizes.

Reduced flow. We repeated the test and replaced the 2 x 03 jets with 2 x 02 jets.

After replacing the 2 x 03 jets in the wand with 2 x 02 jets, this has now reduced the potential flow through the wand jets by 33%. Due to the reduced and restricted flow the pumps will now reach pressure a lot quicker and the pump with no controls fitted should create greater back pressures whereas the digital system will adapt and adjust the flow and pressure to compensate for the jet changes. On the higher pressure pump the back pressure behind the jets may increase but there is little benefit because we now have a 1/3rd less flow potential through the smaller jets.

Increased flow. On the second part of our test we increased the flow by using 4 x 02 jets against the original 2 x 03 jets used in our first video.

We then went the other way and increased the potential flow by using a hard floor wand fitted with 4 x 02 jets which would equal the flow of 2 x 04 or 8 x 01 jets. During the previous test when no flow was available the higher pressure pump created 350psi back pressure behind the jet, when it was allowed to open flow unhindered it maximised its flow at 84psi through the 2 x 03 jets. With the high pressure pump already delivering its maximum flow through the 03 jets at 84psi, Increasing flow capacity further by increasing the jet size will not increase the performance of the pump delivery further.

As with all the other tests the EMVs digital system will not drop back pressure and lose flow performance because of the larger 4 x 02 jets. With the increased flow through the larger jets the digital control system on the EMV will adapt by adjusting the flow and pressure to compensate.

We designed our control system to balance and regulate flow with pressure to adapt with any changes in flow or pressure. The way we do this is with a true variable speed & pressure control system. The system monitors the pressure at the pump outlet and then regulates the pump speed and pressure to deliver the correct set pressure at the tool end. At the end of the part 2 video we demonstrate with the 4 x 02 jet wand and high flow that we can still increase the smaller pumps psi potential further.


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.

Book your Service & Maintenance online 24/7

You can now book your service & maintenance online 24/7 with ease, you can even book using your phone or tablet with our new mobile friendly website Here at Texatherm we're taking service to the next level. We pride ourselves on our customer service as well as our equipment and product quality and want to make our clients interaction with us as easy as possible.

We love listening to our customers suggestions and ideas on things we can do to help them, one thing that was brought to our attention was being able to book in service & maintenance online 24/7. We understand our clients sometimes work unsociable hours and have busy schedules. Sometimes booking in equipment for servicing and those important maintenance jobs can slip your mind, especially when you have to wait for offices to open before calling. Now after a days work, just put your feet up and go online 

Just follow the easy step by step instructions below

Firstly go to the services tab option on top right of the website and from the drop down menu click on "servicing & repairs"

You'll then be taken to our online booking system. Just hover your mouse over the date you would like to see if it is available, If free just click the date.

You will then be offered different time options and availability to choose from. Pick the time you would like and click "Book Appointment"

Lastly just fill in our quick online form requesting the service you require the machine model and any extra information we may need. At this stage please also confirm if you require collection of your equipment. Once you click the "request appointment" tab, you will then receive an email confirming your appointment request. Our engineers will then approve the booking and send you an email acknowledgement.

Job Done!

Rug Cleaning At Its Best

We recently visited one of our clients Red Dragon Rug Spa who specialise in rug cleaning.

We were so impressed we wanted to share our experience with other industry professionals. Troy was very accommodating and took us through the whole process from start to finish.

Firstly we were impressed at the shear investment Red Dragon Rug Spa have put in to building a state of the art facility which can cope with the largest of rugs. We now fully understand why so many of our clients are sub-contracting Troy to undertake their specialist rug cleaning.

Red Dragon Rug Spa wash almost all of their rugs using their immersive cleaning methods. Then can also clean using various other methods right the way from full immersion washing to completely dry cleaning. They test all rugs for colour bleed and shrinkage prior to placing them into their wash pits and it is this test that will determine the best method of cleaning.

Troy calls it his 7 step signature treatment and he showed us the whole rug cleaning process from start to finish.

1. Identifying

We took a very large rug with us that Troy firstly measured, and tested for colour fastness. Then he inspected it for any pre-existing issues such as pile reversal, pet urine issues, and general damage. Once he completed this inspection, a report was made and photographs taken.

2. Dry soil and grit removal

This process starts firstly by using a Pile Lifter, a machine that will lift and open the pile of the rug while vacuuming up all loose soil, pet hair etc. from deep within the pile. Troy then used a “Rug Badger”, this machine gently beats and vibrates the rug, this will remove all the dry soil and abrasive grit which unless removed could damage the fibres and prematurely age the rug. He then finally used the pile lifter one more time to finish this step of the process.

3. Immersive cleaning

The deep cleaning washing process can now begin by placing the rug in to the wash pit. The pit will was filled with water and a “rug roller” was used to squeegee the water through the rug. The rug was then thoroughly washed on both sides with a specialist Oriental rug shampoo and once again the “rug roller” was used to ensure that the shampoo passed right the way through the rug. Troy then cleaned and detailed the fringes by hand.

4. Rapid moisture removal

The rug was then rinsed and placed in to Troy’s impressive “Rug Revolution machine ” which is a large centrifugal spinning machine that spin dries the rug, this ensured that all the excess water was pulled out leaving it as dry as possible (similar to a spin cycle on a washing machine). Rapid moisture removal is essential to eliminate the risk of colours bleeding into each other

5. Rug Grooming

Once removed from the centrifuge the pile is then set to its original position, (which is always running down to the bottom of the rug) and placed in Troy’s specially designed drying room. Rugs would normally be left in there over night to dry, sometimes longer for very thick or shag pile rugs.

6. Moisture test

Troy explained that they test all rugs with a Protimeter before removing them from the drying room, this ensures they are completely dry and safe to be stored if needed.

7. Detailing

The final step, Red Dragon Rug Spa then closely inspect the rug for any spots/stains that may need further specialist treatments including any extra fringe detailing. Any additional treatments eg protection will usually be applied at this point, then the rug will once again be returned to the drying room for the final time.

In conclusion we'd thoroughly recommend Red Dragon Rug Spa to any industry professional looking for a rug cleaning partner.

Please call Troy or Barry on 01269 843491 or visit Troy can also be contacted via e-mail on