SECTION 6
LOW PRESSURE WATER
May 2003
6-1
05148390c
Section 6 LOW PRESSURE WATER SYSTEM
6 Low Pressure Water System
The SL-IV Waterjet Pump is equipped with two low pressure circuits:
• Cutting water supply for HP intensifier assembly.
• Cooling water supply for the oil-to-water heat exchanger.
The low pressure water system supplies the pump with the following:
• Water of sufficient cleanliness and pressure to the inlets of the two (2)
HP cylinders.
• Cooling water of sufficient flow rate and low temperature to the oil-to-
water heat exchanger.
6.1 Oil Cooling Water Supply
The oil cooling water supply circuit includes the water modulating valve.
Refer to Figure 6.1 for a schematic diagram of the oil cooling water
circuit.
See “Reciculation System” Section 10.2 for details on adjustment of
water modulating valve (2).
The maximum flow rate of the cooling water is specified in Section 11
“Specifications” under “Hydraulic Oil Cooling.” A minimum inlet
pressure of 40 psig and 70
0
Fahrenheit maximum inlet temperature is
required to maintain oil temperature under extreme operating conditions.
6.2 Cutting Water Supply
Refer to Figure 6.2 for a schematic diagram of the LP cutting The cutting
water supply circuit. Refer to the Parts Lists (Section 12) for detailed
component information on the LP cutting water circuit. The LP water
supply includes the following:
• Low pressure water filter
• Inlet water shutoff valve (solenoid operated)
• Booster pump driven by main motor
• Several pressure gages and switches, and a temperature switch
Most components in the LP cutting water supply circuit are stainless
steel or neoprene or other plastic. A stainless steel inlet solenoid shutoff
valve (11) is available on request. Pressure and temperature switches are
connected to a PLC located in the electrical enclosure. The PLC which
monitors out-of-tolerance conditions, including the following:
• Low water pressure at the booster pump inlet (switch (17), T and Q
series).
• Low water pressure at the intensifier inlet (switch (16), T and Q
series).
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