Product Manual

The Unloader Valve

Hoses and Couplers

During Operation

Chemical injector use with interchangeable tips

Be sure to flush injection system with clear water after use.

Multi-Reg (Adjustable) Tip

Chemical injector use with multi-reg tip

Calibration

Pressure cleaners are built with one of two types of unloaders: The Trapped Pressure Unloader or the Flow

Actuated Unloader. After the pump is filled with water, the direction of water flow must be controlled with

the unloader or regulating valve. A positive displacement pump is always delivering a specific volume of

water whether the spray gun is open or closed; therefore a device is needed to control the direction of flow,

either to the open spray gun or redirecting the flow back to the inlet side of the pump when the spray gun is

closed. Without an unloader valve, dangerously high pressure will be produced when the spray gun is

closed because the water being forced out of the pump has no place to go. The unloader is used as a safety

device to guard against failure of component parts, and the development of dangerously high pressures.

Factory supplied hoses are sized in length and diameter for best operational performance and size within

the pressure capabilities. Additional hose added to the machine may change the performance of the

machine. Consult factory if you have any questions. When replacing or disconnecting the quick couplers

be sure the machine is shut off and relieve the pressure from all hoses.

The pressure was set at the factory during the testing procedure, no adjustments to the machine should be

required for operation. During operation do not leave the machine running for more than 2 minutes without

the trigger gun being pulled. Although your machine has a by-pass valve on it and may have a thermal

relief system, this can cause extensive pump damage. If machine will not be discharging water for more

than 2 minutes, shut the machine off.

Your pressure washer is supplied with a downstream chemical injector. The 1/4" clear vinyl tube is be

inserted into the desired chemical to apply. Be sure to use the black, low pressure nozzle to inject

chemical. The chemical injector will only open up and allow chemical into the line when this tip is used.

This tip enables the pressure to drop to approximately 250 PSI to draw chemical. Some injectors can be

shut on and off or the rate of injection can also be set by turning the knob that the clear vinyl tube attaches

to.

See calibration below.

If your machine is supplied with an adjustable tip, the spray pattern can be changed by rotating the outer

shell of the nozzle. The nozzle also will move forward and backward.

The nozzle must be pulled back toward the gun for high pressure rinse. When the nozzle is moved forward

you will have low pressure and the soap injector will start to draw chemical.

Move the outer shell of your tip forward (away from the gun). This will lower your pressure and allow the

injector to start to draw chemical. Chemical will only be drawn in the low pressure setting. Pull nozzle

back for high pressure rinse.

If an accurate injection rate is desired, use this formula: (GPM x 128) ÷ (ounces drawn in 1 minute) = x:1

IE: If a 2.0 GPM machine draws 8 ounces of chemical in 1 minute: (2x128)/8=32:1

TIP STYLES