Hog Technologies STRIPE SH7500, Operation Manual

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Section 2 - Stripe Hog Systems
High pressure is controlled by the RPM of the engine
and/or by adjusting the manual bypass valve on the
pump. Since engine RPM also controls the level of
vacuum, adjusting the pressure using the manual
bypass valve is beneficial when maximum engine
RPM is required for developing and maintaining
proper vacuum for the debris recovery system and
less than maximum waterblasting pressure or gal-
lons per minute is desired for the material being
removed or the waterblasting tools being used.
The gallons per minute (GPM) produced by the
Ultra-High Pressure pump is determined by pump
RPM, plunger diameter, length of stroke and num-
ber of plungers. Once the UHP pump is engaged, it
continually displaces water provided by the charge
water pump. The charge water travels through
the low pressure side of the UHP pump manifold,
then through a set of 3 univalves into the 3 stuff -
ing boxes. The plungers then force the water back
through the high pressure side of the univalves
and manifold. These univalves are critical to the
operation of the UHP pump as they facilitate two
functions at the same time. They allow low pres-
sure water from the charge water pump to enter
the stuffing box and Ultra-High Pressure water to
PTO, Dump Valve 40K & Charge Pump Switches In Control Panel
Charge Pressure & High Pressure Digital Gauges
flow into the high pressure side of the manifold.
Once the water is forced back through the manifold,
it is directed out to the blasting head or back to
the clean water tank by the dump valve. Without
these valves it would be impossible to separate the
high and low pressure water from each other. Hog
Technologies recommends that you keep 3 fully
serviced univalves in your spare parts system to
prevent downtime.
Dump Valve (Diverter Valve)
The dump valve is a safety feature that is located
on the UHP pump manifold and controlled by the
DUMP VALVE 40K switch in the cab control panel.
When activated, high pressure water is diverted
to the blasting head. When deactivated, water is
diverted from the blasting head to the clean water
tank, immediately eliminating high pressure water
at the blasting head. The dump valve assembly
consists of a hydraulic cylinder, shutoff cartridge,
diffuser tube and digital high pressure sensor.
The shutoff cartridge is located inside the body of
the diverter valve assembly. It is generally open
and controlled by the DUMP VALVE 40K switch
in the cab control panel. When the DUMP VALVE