What is an Unloader Valve?
The spray gun and unloader make up a two-part valve system that directs water into bypass and back to the pump or float tank. The spray gun shuts off the flow of water causing the unloader to recirculate the water back into the inlet side of the pump. This is called sending the water into bypass.
Unloaded valve problems and solutions
Problem: Frequent cycling of unloader
Probable Causes: Damaged, check valve O-ring
Probable Causes: Restricted bypass
Probable Causes: Leaking connection or shut off gun
Solution: Repair leak
Problem: Unloader does not reach pressure
Probable Causes: Unloader not properly sized
Solution: Change spring or type of valve
Probable Causes: Piston O rings worn out
Probable Causes: Obstruction between seat and piston
Solution: Clean the seat
Maintenance should be performed by a Hotsy trained technician every 400 working hours or 10,000 cycles.
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