Dynaset HPW 180/90-115 Gebruiksaanwijzing - Pagina 7
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Prior to starting-up the HPW-pump it is checked whether all couplings in hydraulic and pumping fluid circuits
are properly connected and there are no leakages over the equipment.
Ensure that the water tank is refilled and intake line's strainer/filter is clean. If water (or any other pumping
fluid) is taken from pressurized supply, ensure that the shut-off valve is open.
HPW-pump starts immediately after the hydraulic flow has been put on either with control valve (manual or
solenoid) and/or by pulling the trigger of spray gun.
Immediately after opening the water pressure line, air is being vented out from the pumping fluid circuit and
high pressure washing is about to begin!
DO NOT TRY WITH HAND THE WATER OR AIR COMING OUT FROM HIGH PRESSURE NOZZLE!
The nozzle, attached to a pressure tool, determines the flow rate and pressure of water when operating
parameters of hydraulic circuit meet HPW-pump's requirements.
In other words, even your HPW-pump fits perfectly to hydraulic system and does well with the job,
dimensioning of the pressure tool should never be underestimated as a very important step for ensuring the
optimal water jet or hydro-demolition power in each application.
When the HPW-pump is equipped WITH WATER PRESSURE UNLOADER VALVE:
1. The valve afore is for adjusting the pressure and flow rate of water or any other pumping fluid. Boosting
the pressure increases flow rate and vice versa.
2. After closing water pressure line, whereupon the adjusted pressure limit is being reached, water pressure
unloader valve puts the water to free circulation mode.
When the HPW-pump is installed WITHOUT WATER PRESSURE UNLOADER VALVE:
1. Pressure and flow in pumping fluid circuit are adjusted by adjusting corresponding parameters in hydraulic
circuit.
2. In circuits based on constant displacement pump closing the water pressure line opens the pressure relief
valve in hydraulic system. IS TO BE KEPT IN MIND THAT HYDRAULIC FLUID CIRCULATION THROUGH PRESSURE
RELIEF VALVE CAUSES HEATING OF HYDRAULIC SYSTEM!
3. In circuits based on variable displacement hydraulic pump closing the water pressure line adjusts pump's
swash plate at 0° angle when hydraulic pump produces flow only for self-lubrication and self-flushing.
Pressure control must be fast enough to protect HPW-pump from pressure peaks or the hydraulic system
must be provided with pressure peak limiter.
HPW-pump is halted by shutting off the hydraulic flow. High pressure remains in closed water delivery line,
which should be depressurized to avoid unexpected water discharges. If spray gun or similar tool has been
used, pull the trigger for some time after the pump has halted.
In cold season HPW-pump and pumping fluid pressure line should be dewatered after a working shift. Detach
the intake hose from HPW-pump and run it for a while until all water is moved from water circuit.
ATTENTION! In cold season HPW-pump can be used for circulating the water through water circuit to keep it
unfrozen in transit.
Different water based solutions and special liquids can be used as pumping fluid with HPW-pumps. The only
requirement is that the pump MUST be thoroughly cleaned and flushed with sweet water after the job to
prevent pump and its sealing from oxidation and water valves from seizing. The procedure should be made
even if such a harmless liquid as sea water has been used.
ATTENTION! HPW-pump can be run dry unlimited time without any harm, because self-lubricating sealing and
circulating hydraulic oil prevent the pump from overheating.
ADJUSTING FLOW RATE AND PRESSURE OF PUMPING FLUID
HPW - HIGH PRESSURE WATER PUMPS
OPERATION
PUMP START-UP
STOPPING HPW-PUMP
May 2014