Low-Pressure Water; Low-Pressure Water Overview; Inlet Cutting Water Supply - Hypertherm HyPrecision 100D Instruction Manual

6 Low-Pressure Water

6.1 Low-Pressure Water Overview

This section describes the components and operation of the Low-Pressure Water assembly. Some
references to components and assemblies may not be applicable to your pump model. For example,
systems equipped with an air/oil cooler will not have a water/oil heat exchanger. Refer to the Drawings
and Parts Lists section of the manual to determine which components you have.
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Inlet Cutting Water Supply

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Cooling Water Loop (Not all Models)
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Waste Water Discharge
The hookups for these connections are located on the utility panel of the pump usually located at the
back. Details of incoming and outgoing utility connections are included in the installation drawings for
your pump model and in the Drawings and Parts Lists section of this manual.
6.2 Inlet Cutting Water Supply
The inlet cutting water supply includes all the plumbing components from the pump inlet connection to
the inlet to the intensifier. It includes the following:
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Boost Pump Assembly
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Inlet Cutting Water Filtration
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Low-Pressure Water Switch
The low pressure cutting water circuit can be used with inlet water qualities that are provided by water
softening or reverse osmosis. De-ionized water is not recommended unless your system was purchased
with all stainless steel water fittings. Most installations with normal city water pressure do not require
an adjustment of the bypass relief valve. See the Inlet Cutting Water Requirements in the
Specifications section of the manual for further information.
Inlet Water Valves and Connections
All Hypertherm pumps have incoming water connections on a utility bulkhead. Electronic solenoid
valves and manual valves at the bulkhead fittings control incoming water supply. The incoming water
connection details are outlined in the Specifications section as well as on the installation drawings for
your specific pump.
Boost Pump Assembly
The boost pump takes the relatively low-pressure inlet water and elevates it to a higher pressure to
provide adequate intensifier water supply to meet the higher flow rates of larger pumps.
The boost pump assembly consists of the pump, a bypass relief valve, and a check valve. It operates by
taking the inlet supply water and adding pressure based on the setting of the bypass relief valve.
The pump has been set up to operate with inlet water pressure of 40 to 70 psi. If you are providing
incoming cutting water from a reverse osmosis system, please contact an authorized Hypertherm service
representative to make sure that the boost settings are correct. The bypass relief valve has been factory
set to create a boost pressure of 60 psi. For example, an inlet pressure to the pump of 50 psi will result
in a total pressure of 110 psi.
The inlet water components of the pump are rated to a maximum pressure of 125 psi. High inlet
pressure may result in the boost pump creating excessive pressure and damaging components. If either
of the panel gauges reads over 125 psi, turn off the boost pump as explained below.
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