Hog Technologies STRIPE SH7500, Operation Manual

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Section 2 - Stripe Hog Systems
40K switch is on, the shutoff cartridge is closed
by the hydraulic cylinder forcing all high pressure
water to the blasting head. When the DUMP VALVE
40K 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
OMSI Drive PTO if charge water pressure
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 40K
switch is turned off. If system pressure does not
immediately drop below 100 PSI when the dump
valve is activated, do not use the equipment until
repairs are made to the dump 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 heads 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 heads. 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 heads. 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).
Manual Bypass Valve & Rupture Disc
Typical Dump Valve
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 diverter 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