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Unloader valve - Briggs & Stratton 020272 Elite Series Portable Gas Pressure Washer

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Want to know what the black Knob, I think called unloader valve is used


Hubert, The unloader valve is like a by pass for the water and regulates/controls water pressure and redirects water when gun trigger is released. Check the attached links,instruction and guides to learn more about Pumps/unloader, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Pressure Washer Unloader Valve
How to replace an unloader valve on your pressure washer pump
All About Unloader Valves ePowerWash
How to Replace an Unloader Valve on Pressure Washer Repair Guide Help...

May 17, 2016 | Garden

1 Answer

Fire department says it is leaking at pressure switch, does this unit have a unloader valve and a check valve?


It would have to have a check valve and a unloader valve or it could not start again with any air pressure in the tank. The unloader is in the limit switch, should see a small plastic air line going into the limit switch, when the limit switch shuts off the electric motor it drains the pressure in the cylinder so there is no load on the compressor so it can start, so if there is air coming out of the unloader when the electric motor is shut off it is the check valve if it is coming out all the time even with the motor running it is the unloader in the limit switch.

Apr 21, 2016 | Air Tools & Compressors

2 Answers

What is a bypass unloader


According to epowerwash.com:
"The unloader valve diverts water flow into bypass when the trigger gun valve is closed. Unloaders may be designed to respond to either an increase in pressure or a change in flow. The unloader valve may also be used for variable pressure adjustment."

More information here:
All About Unloader Valves ePowerWash

Jun 06, 2014 | Alfred Karcher Pressure Washer

1 Answer

Pressure off and on every few seconds with my karcher 3000BH


hi there rjcomer2

here is web site for parts
http://www.ereplacementparts.com/karcher-2500-11944010-pressure-washer-parts-c-33388_33389_33973.html

sounds like you have a unloader valve problem or a crack in the pressure manifold housing between pressure outlet and unloader valve assy allowing unloader to cycle on/ off

or some dirt trapped in the unloader valve seat , make sure you have good supply of water - ie good flow from tap to pump

try cleaning unloader 1st and fitting in line tap filter

hope it helps

pauly46

May 20, 2011 | Karcher 2500 PSI Pressure Washer

1 Answer

Craftsman gas powered pressure washer kills motor when you release wand trigger.


The unloader/bypass valve is jamming or defective. When you are not pressing the button the water is directed through the unloader valve/check valve to recirculate.It is common for them to corrode or for the spring to break.If it has an adjustment screw on the unloading valve for unloading pressure make sure you count the turns before disassembling it to make sure you dont over pressurize it.It is not opening causing the engine to choke out.Please let me know if this helps

Jan 19, 2011 | Garden

1 Answer

Compressor wont restart because of head pressure


Piston air compressors have to unload to permit a restart, the two mot common types are an unloader valve or free air unloaders.

with an unloader valve this system uses a check valve mounted in the discharge line as it enters the tank, when the pump stops this check closes and does not permit the tank pressure to return to the pump. a unloader valve also opens to allow air pressure in the discharge line to vent, this valve is either on the pressure switch or on some models is on the pump, and is a centrifugal type.

Free air unloaders or head unloaders are a set of fingers that hold open the intake valves on the cylinders to permit the piston not to pump air against a head load, and once the pump is running the fingers retract to allow the pump to function as normal.

Jan 19, 2010 | Air Tools & Compressors

1 Answer

Compressor with head unloaders. Do I use a check valve with unloader port or a switch with a unloader on it?


Honestly you can use either. Some compressors come with both. My personal preference is the head mounted unloader valve because it's far more reliable and a lot less complicated.

However if you use a switch mounted unloader valve you can connect the tubing to either the head or the tank check valve.
Anywhere on the backside (between the check valve to the head), of the tank check valve is fine

Nov 14, 2009 | Northern Industrial 2 Hp 6 Gallons...

1 Answer

Unloader Valve - Karcher Pressure Washer


where is the unloader valve locaed on a Briggs Stratton pressure washer?

Oct 02, 2009 | Honda Karcher G4000RH Pressure Washer

2 Answers

Unloader valves


Yes, your compressor will work just fine with a Load Genie continuous run unloader from www.grainger.com. The part number is 4tk14 with a cost of about 45.00. This unloader has a built in check valve so you can remove the present in-tank checkvalve and save it for later use. All that you need to do is install the unloader at the tank and compressed air in to top of valve. (you may have to buy extra fittings to make it work with your tubing size) Adjust valve to open just before the pressure switch cut-off setting. The unloader will bypass the compressed air and will have less stress on the motor. You will not need to use the present unloader at the pressure switch. The only caution is to manually unload the Load Genie upon initial start if there is pressure in the line. Good Luck with your project.

Mar 31, 2009 | Northstar Electric Stationary Air...

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