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Which Unloader Is Best For A Commercial Pressure Washer?

Updated: Nov 28, 2023


Pressure Sensitive or Pressure Trapped Unloaders for Commercial Pressure Washers

Which unloader is best?


When it comes to commercial pressure washing, there are two primary types of unloaders across the industry: pressure sensitive and pressure trapped. Both types of unloaders serve the same basic purpose of regulating water pressure and protecting the pump from overheating, but they work in slightly different ways. In this blog, we'll take a closer look at the differences between these two types of unloaders.


Our choices are often a K7 Unloader or VrT-3. One is Pressure Trapped, the other is Pressure Sensitive. The choice is yours to make.


Pressure Sensitive Unloader:

A pressure-sensitive unloader works by sensing the pressure in the pump's discharge line and adjusting the flow of water accordingly. When the trigger on the pressure washer gun is released, the pressure in the discharge line increases, causing the unloader to redirect water flow back to the inlet side of the pump. This helps to reduce pressure and prevent the pump from overheating.


One of the main benefits of a pressure-sensitive unloader is its simplicity. Because it relies on the pressure in the discharge line to function, it doesn't require any additional components or adjustments.


A Pressure Sensitive Unloader like the K7 relieves the pressure hose when you let off the trigger. The pressure hose goes limp instead of maintaining constant pressure build up in the line.


Pressure Sensitive Options from Manatee Pressure Washer Supply and Repair:







Pressure Trapped Unloader:

A pressure-trapped unloader, on the other hand, works by trapping water pressure in a chamber and using that pressure to regulate the flow of water. When the trigger on the pressure washer gun is released, the pressure in the discharge line decreases, causing the unloader to open and allow water to flow through the system. Conversely, when the trigger is pulled, the pressure in the discharge line increases, causing the unloader to close and redirect water back to the inlet side of the pump.


One of the main benefits of a pressure-trapped unloader is its ability to maintain a more consistent pressure over a wider range of flow rates. This can be especially important in commercial settings where pressure fluctuations can impact the quality and efficiency of the cleaning process. Additionally, pressure-trapped unloaders are often more durable and better able to withstand the demands of heavy use.


Pressure Trapped Unloaders keep pressure in the pressure hose while you are off the gun often allowing you to reach further distance when pulling on and off the trigger. (We call it the bees nest popper)


Pressure Trapped Options from Manatee Pressure Washer Supply and Repair:






Which Unloader is Right for You?

Ultimately, the choice between a pressure-sensitive unloader and a pressure-trapped unloader will depend on your specific needs and preferences. If you're looking for a simple, affordable solution that will get the job done, a pressure-sensitive unloader may be the way to go. However, if you need a more precise and reliable system that can handle heavy use over an extended period of time, a pressure-trapped unloader may be the better choice.

Regardless of which type of unloader you choose, it's important to invest in a high-quality system that is designed to meet the demands of your specific cleaning applications. With the right equipment and a little bit of know-how, you can achieve professional-quality results that will help your business thrive.


If you need help or have any questions about your commercial pressure washer give us a call at 941-216-3710 our reach out to us via chat anytime at www.MPWSR.com



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