HARBEN 4018 DPK, Руководство по эксплуатации и техническому обслуживанию

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4.9. Bypass Valve Operation
The bypass valve is used to control the amount of water that is sent through the jetting hose
and ultimately to the nozzle. The use of this valve will “fine tune” the amount of water you send
to the nozzle.
In normal operations, the valve will be shut by being turned clockwise until it seats. This will
give the operator full pressure and flow. For example, on a Harben Jetter that is a 4018 model
with ½” X 500’ of jetting hose, this will allow you to achieve a performance of 4,000 PSI and
up to 18 GPM.
Anytime there is a need to reduce the amount of water flow to the nozzle, especially in
applications that require the use of Mini Jet Kits that use ¼”, 3/16” and even 1/8” mini hoses,
use of the bypass valve helps divert some of the water back to the tank which lessens the
load on the engine and pump.
To use the valve:
1. Turn the handle on the valve counterclockwise until it stops. This opens the valve
completely. This needs to be done before turning on the Jetter or before
connecting to the Mini Jet Kit.
2. Start the Jetter. The amount of flow will be at the very minimum.
3. To increase the amount of water to the nozzle, turn the handle clockwise to start
closing the valve. The pressure will increase as you start to close the valve.