How To Release Pressure From Pressure Washer
Home Improvement & Tools

How To Release Pressure From Pressure Washer [5 Ways]

If your pressure washer is constantly spitting water out, it may be because the pressure has built up over time. 

In case, that pressure isn’t released properly, the machine can become dangerous and may even cause property damage. If you’ve ever experienced the sensation of being under pressure when using a washer, you might know how frustrating it’s. 

So, it’s time to take some measures. However, many of us don’t know how to release pressure from pressure washer “effectively and safely”. Maybe you’re one of them as well. Don’t worry; you’re not alone. 

We’ve compiled our pressure release guide with some simple steps to get your job done in no time. So, let’s move ahead. 

How Does Pressure Washer Unloader Valve Bypass Work?

The pressure bypass unloader valve, also known as the pressure unloader valve comes as a relief when a pressure washer gets an excessive amount of trapped pressure. However, it depends on the type of valve you have, whether it is activated by a rise in pressure or a fall in the trickle.

When pulling the trigger, the valve releases the trigger gun’s spring and ball-check technique, sending the water into the bypass as the gun is pulled away.

The spring arm that delivers water and the machine that directs it oscillate from one position to another and redirect the water, releasing it in a repeating routine until you trigger your spray wand again.

When you activate your spray wand again, the release unloader turns off and reroutes the water to your spray nozzle.

Unloading the pump and reactivating the spring and ball mechanism restart the flow of water and leads to the discharge of water from the spritzer you’re done with.

Pressure Washer Unloader Valve Symptoms

If you have a pressure washer that uses an unloader valve, it’s important to know how to properly clean and maintain it. The unloader valve is a small orifice that allows water to escape from the pump while the pressure washer is in use.

Over time, dirt and debris can accumulate around the orifice, causing it to clog. Ultimately the pressure washer pressure locked. When this happens, the pressure washer will not operate as smoothly as it should and may even experience problems with water flow.

In the event that you are experiencing any of the following problems with your pressure washer unloader valve, go for releasing pressure from the washer: 

  • It’s difficult to open the valve.
  • The spray isn’t coming out of the valve.
  • The pressure washer doesn’t seem to be operating at full power.
  • There’s water everywhere when you attempt to use the washer.
  • The sprayer has been leaking for some time.

How To Release Pressure From Pressure Washer

When you’re finding that your pressure washer is taking a bit longer than usual to clean your surface, here’s our easy and quick pressure washer unloader valve adjustment process: 

  1. Please turn off the machine and unplug it from the outlet.
  2. Find the release valve on the side or top of the machine. It’ll look like a small, black knob.
  3. Twist the knob in a counterclockwise direction until the pressure is released. In this step, you may need to use pliers or a wrench to loosen it. 
  4. You’ll hear a hissing noise as the air escapes from the machine.
  5. Allow all the air to escape before reattaching the nozzle and turning on the machine again. This will help to prevent any future problems with the machine.


If the knob doesn’t work, you may need to release the pressure by opening up the water supply hose. This is usually a blue hose that runs from the machine to the faucet.

Disconnect the hose from the faucet and wait for the pressure to release. Once you’ve released the water pressure, you can connect a garden hose to your faucet and let it run until it’s empty.

Finally, take a deep breath and relax! You’ve just mastered how to release pressure from a pressure washer.

How to Prevent Excessive Pressure Blockage in A Pressure Washer

When using a pressure washer, it’s important to be aware of the potential for excessive pressure blockage. This can occur when too much debris accumulates in the nozzle, preventing the water from passing through.

It’s important to take steps to prevent this blockage, as it can damage the equipment and may even cause injuries. There are several things you can do to help avoid excessive pressure blockage in your pressure washer:

  • Always use the recommended nozzle for your machine.
  • Never point the nozzle at anyone or anything that you don’t want wet.
  • Avoid using the pressure washer on dense surfaces like concrete or asphalt.
  • Check your pressure washer for proper operation at least once every month or two.
  • Make sure there is plenty of clearance around the object you are trying to clean and keep bystanders out of the way.
  • Avoid using your pressure washer in the rain or near water.

A Pressure Washer is designed for a specific purpose. It is not designed to be used as an all-purpose cleaning tool. The machine should be used as directed by the manufacturer and in accordance with the owner’s manual. 

If you have any questions about using your pressure washer, call your nearest authorized service dealer.

Related: How to remove the nozzle from Sun Joe Pressure Washer


  • Where is the unloader valve on a pressure washer?

The unloader valve is on the pressure washer wand. It’s the valve that releases the pressure from the wand when you release the trigger.

  • How long can a pressure washer run without water?

For even a brief moment, the pump will work harder than it should without water coming through the source hose. The pump is designed to receive water from the supply hose and push it out through the nozzle. So, a washer may not run more than a few seconds without water.

  • Is there a pressure relief valve on a pressure washer?

Power washers connected to the trigger gun control function normally include a shutoff valve or pressure relief valve.


By now, we believe you’ve got all the required knowledge regarding how to release pressure from pressure washer. One thing you must note that you must listen to the noises from the pressure washer to ensure if it’s running or not.

As an Amazon Associate, I earn from qualifying purchases.

Leave a Reply

Your email address will not be published.

Social media & sharing icons powered by UltimatelySocial
Follow by Email