Bypass prime spray valves fitted to airless spray equipment is an important control device

Blocked Airless Spray Gun

If your airless spray pump primes and pressurises but nothing happens when the trigger is pulled, and it is not the airless spray tip that is blocked, the actual spray gun hand piece could be where the problem is located.

The first thing that needs to be done is relieve all pressure from the airless spray system by opening the prime spray or bypass valve and turn the machine off.


Use Airless Spray Safely

Airless spray gun safety.

Serious injury can occur if an airless spray unit is not used correctly.

Even small handheld DIY airless spray guns reach pressures which can cause serious fluid injection injury. Never place any part of the body near nozzles or remove guards.

Always ensure that all components of your airless spray machine including airless paint spray hose, spray gun and airless spray tip are rated to a working pressure that exceeds the output of your airless spray pump.


Diaphragm Airless Valve Checks

Diagnosing problems with valves in hydraulic diaphragm airless paint sprayers.

Hydraulic diaphragm airless paint spray machines are usually fairly basic simple machines with not much to go wrong. Unlike piston airless paint sprayers the valve action in diaphragm airless sprayers is much more passive and susceptible to problems that may not ordinarily affect piston pump.

A piston airless paint spray may effectively continue to operate using only one of the two valves commonly found in piston airless paint sprayers and enable the operator to complete a job.


Piston Airless Valve Diagnosis

Diagnosing problems with airless piston pump pressure valves.

Here is a way to test your piston airless spray pump to ensure the inlet valve and outlet valves, including the relief valve are functioning correctly.

This test is much easier to do and see the results with a large longer stroking airless piston pump compared to a small short stroke fast cycling piston airless sprayer.

A small airless spray tip that slows the output of the airless piston pump will make this test easier to read.


Cleaning Your Airless Sprayer

A most common cause of airless spray gun problems and early failure are a result of incorrect cleaning and airless paint sprayer storage procedures.

When your airless paint spray job has completed the first step is to recover as much of the remaining paint that still remains in the airless spray unit. Consult your airless paint sprayer operation manual for the recommended procedure to remove any remaining paint from the airless machine and to properly flush the airless unit out.


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