WWW.AIRLESSCO.COM TEL: 805-523-0211 FAX: 805-523-1063
Email: [email protected]
WWW.AIRLESSCO.COM TEL: 805-523-0211 FAX: 805-523-1063
Email: [email protected]
TROUBLESHOOTING UNLOADER VALVE
PROBLEM
CAUSES
SOLUTION
Unloader cycles
•Damaged seat or cone
•Replace
•Fitting Leaking
•Check and renew
•Restricted bypass
•Clean or adapt
Unloader does not
•Unloader not properly sized
•Select proper spring or new unloader
come up to pressure
•Foreign materials between
•Clean the seat
seat and shutter
•Piston O-Ring worn out
•Replace
•Nozzle worn out
•Replace
Pressure peaks
•Spring totally compressed
•Loosen and change nozzle size
•Excessive flow in bypass
•Select another unloader
•There is not a min. 5% of
•Adjust size of piping
total flow in bypass
Unloader does not
•Check valve jammed
•Clean or replace
bypass at low pressure
•Check valve O-Ring worn out
•Replace
•Foreign materials on valve
•Clean
Chemical Injector does
•Foreign matter in chemical hose
•Clean
not draw solution
•Foreign matter in check valve
•Clean
•Insufficient pressure drop
•Put system in low pressure mode
across injector
•Shorten discharge hose
•Check spray tip
APPLICATION & INSTALLATION OF THE
UNLOADER VALVE
APPLICATION
This product is to be used with clean, fresh water. For different or corrosive liquids, contact the
Technical Support Department. With not-clean liquids, appropriate filtration should be installed.
Select the valve based on the nominal operating rating: system rated pressure, maximum flow and
maximum temperature.
Under no circumstances should the pressure of the system exceed the maximum rated pressure of
any component. When installed on hot water cleaners, this valve is to be installed before the boiler.
INSTALLATION
On a system that produces hot water, consider installing safety devices which limit the accidental
increase of the fluid temperature. Always install a safety valve to protect the operator and system.
Choose a correct nozzle size, able to discharge regularly, on bypass, at least 5% of the total flow
of the system, in order to achieve a constant pressure and avoid troublesome pressure spikes.
When the nozzle wears, the pressure drops. After installing a new nozzle, re-adjust the system to
the original pressure setting.
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