Water cavitation on a pressure washer

 Water cavitation on a pressure washer is the process of gas bubbles forming and collapsing inside the pump, which can damage the pump and cause premature failure. 

Cavitation occurs when the pump's inlet doesn't supply enough fluid to match the amount being discharged from the outlet. This can happen when the net positive suction head (NPSHR) needed by the pump isn't available. The NPSHA is the minimum pressure required at the suction port to prevent the liquid from boiling or evaporating. 

To prevent cavitation, you can: 

• Ensure the pressure applied at the suction port is greater than the liquid's vapor pressure 
• Match the pump specifications to the fluid and system requirements

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Unloader Valves

 

Unloader valves are essential components that regulate pressure and protect the pump from damage. Explore our selection from trusted brands including:

• Landa: Offering high-quality and reliable valves.
• Excell: Known for their efficient and durable designs.
• Troy-Bilt: Providing dependable and effective solutions.

Features and Benefits:

• Pressure Regulation: Ensures optimal performance.
• Pump Protection: Prevents damage and extends lifespan.
• Reliable Performance: Essential for maintaining your pressure washer.

Disclaimer: AllPressureWashers.com is not affiliated with the manufacturers or brands listed on this site. All trademarks, service marks, and company names are the property of their respective owners and are used solely for identification purposes.

833.400.0774

800.917.9274

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ADJUSTING THE PRESSURE-Activated UNLOADER

                  

  pulsar/vrt3 and all pressure trapped

1. the adjusting nut is tightened to increase bypass pressure and loosened to decrease bypass pressure.

2. start with the machine off and the adjusting nut loosened (no tension on the spring). make sure the spray tip is correct for the volume (gpm) and operating pressure (psi).

3. install a pressure guage on pump discharge side of the pump head, or at the outlet where the pressure washer hose attaches.

4. start the machine with the trigger gun closed, the unit will bypass all the water flow from the unloader valve to the pump inlet.

5. with the machine running and the trigger gun now held open, adjust the unloader adjusting nut until the machine reaches the correct operating pressure per the machine specifications            (gpm and psi).

6. pull and then release the trigger gun several times, watching the guage and determine the spike pressure is no more than 200 psi above the operating pressure. adjust as necessary. tighten the lock nut to make the adjustment permanent.

7. make sure the spray tip is correct. remember to adjust the pressure spike to no more than 200 psi over the operating pressure.

8. tip changes – a green spray tip only indicates that it is a 25 degree tip. the tip size is the importan indicator. a 5.6 gpm machine at 35oo psi requires a # 6 tip size. the tip size is laser cut below the color coded plastic nozzle protector. a 2506 is correct for 5.6gpm@3500psi. Phone:833.400.0774 español: 800.917.9274 

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