Section 4
Low Pressure Water System
20479275
9-2010/Rev 02
4-2
Cutting water then passes through a strainer to remove debris before the water enters the booster
pump. The booster pump increases the pressure to the relief valve setting, up to a maximum of
120 psi (8 bar) to ensure proper supply to the intensifier assembly.
Pressurized water passes through the filter assembly where debris is removed to prevent
contaminates from damaging the check valves and seals in the intensifier. The filter assembly
consists of a filter head, housing and a 10 micron absolute filter. A bleed valve on the top of the
filter head is used to release air inside the housing.
If the booster pump pressure entering the outlet manifold exceeds 125 psi (8.6 bar) a relief valve
opens allowing water to exit through the 1/2-inch drain connection on the bulkhead. It is still
possible to operate the machine; however, excess water will continue to be released through the
drain.
Discharge pressure is displayed on the pressure gauge mounted on the front of the machine. The
gauge should read approximately 120 psi (8 bar) while the machine is idling. When it strokes, the
pressure drop should be no greater than 30 psi (2 bar). The water pressure range should remain
between 90-120 psi (6-8 bar) during operation. Discharge pressure is monitored by a 60 psi
pressure switch.
NOTE
While the intensifier assembly reverses direction, the boosted pressure will
fluctuate slightly above and below the normal setting.
A temperature switch, mounted on the outlet manifold, monitors the discharge temperature. To
reduce overheating during a deadhead condition, water is re-circulated through the orifice and
check valve, and routed back through the strainer to the booster pump inlet.
A relief valve built into the filter assembly prevents excessive discharge pressure and typically
operates when the machine is in a deadhead condition. The booster pump is factory set to deliver
120 psi (8 bar) with an inlet pressure of 58 psi (4 bar). The pump may require adjustment to
satisfy system requirements.
From the outlet manifold, cutting water is routed to the sealing head inlet check valves on each
end of the intensifier.
4.4 Service and Maintenance Procedures
To ensure water quality and supply to the high pressure system, the filter element, strainer and
booster pump will require routine servicing and maintenance. The procedures for servicing these
components are detailed below.
NOTE
Refer to Section 11, Parts List for a complete listing of replacement parts and part
numbers.
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