27
27
Section 2 - Stripe Hog Systems
on, the shutoff cartridge is closed by the hydrau
-
lic cylinder forcing all high pressure water to the
blasting head. When the DUMP VALVE switch is off,
the hydraulic cylinder opens the shutoff cartridge,
diverting high pressure water from the blasting
head directly to the bypass hose and the clean
water tanks. This allows the UHP pump to remain
operating at maximum capacity, ready to provide
high pressure to the blasting head immediately.
Note:
A pressure switch in the charge water sup-
ply line near the UHP pump monitors charge
water pressure and automatically shuts
down the UHP system by disengaging the
auxiliary engine PTO if charge water pres
-
sure drops below 30 PSI (1.7 Bar). This is a
safety feature to prevent damage to the UHP
pump from cavitation caused by low charge
water pressure.
When setting pressure ALWAYS ensure that the
system pressure drops to less than 100 PSI (7
BAR) immediately when the DUMP VALVE switch
is turned off. If system pressure does not immedi
-
ately drop below 100 PSI when the dump valve is
activated, do not use the equipment until repairs
are made to the valve.
Manual Bypass Valve
The Manual Bypass Valve is located on top of
the UHP pump Manifold. The operator can open
or close the valve to increase or decrease water
volume and pressure to the blasting head while
maintaining optimum engine RPM and torque.
The Manual Bypass assembly consists of a manual
adjustment knob, bypass cartridge, diffuser tube,
bypass hose and a rupture disc. During high pres-
sure blasting operations, turning the adjustment
knob on the manual bypass valve clockwise will
decrease the flow of water through the bypass
cartridge and system, increasing water volume
and pressure to the blasting head. Turning the
adjustment knob counterclockwise will divert
more of the high pressure water flow through the
manual bypass cartridge to the bypass hose and
clean water tanks, reducing water volume and
pressure to the blasting head. Bypassing a large
volume of water through the manual bypass valve
at high pressure can cause the water temperature
to rise in excess of 210 degrees Fahrenheit (99 C).
Hot water can significantly reduce the service life
of the packing seals in the high pressure pump.
When setting initial blasting pressure, always
open the manual bypass valve completely, set
the engine and UHP pump to maximum operat-
ing RPM and close the dump valve. Then slowly
close the manual bypass valve while monitoring
the high pressure gauge until the desired oper-
ating pressure is achieved. The manual bypass
valve continuously recirculates a small volume
of water back to the clean water tank. Once the
desired blasting pressure is set, high pressure to
the blasting head can be turned on or off using
the DUMP VALVE switch.
Manual Bypass Valve
Dump Valve
Summary of Contents for SK5500
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Page 135: ...135 Section 5 Scheduled Maintenance Hog Technologies...
Page 141: ...141 Appendix 2 Tools Spare Parts...
Page 142: ...142 Appendix 2 Tools Spare Parts...
Page 143: ...143 Appendix 3 Daily Report Pre Op Checklist 1 877 HOG ROAD WWW STRIPEHOGSUPPORT COM...
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