Maintenance
OMAX JetMachining® Center Operator’s Guide
400433D-EN
4 - 35
Matching the size of the nozzle orifice with the size of the dump orifice is important in preventing damage
to ultra high-pressure components. Ideally, at the end of a cut, water pressure gently will fall to the
traverse pressure, and, at the end of the traverse, the pressure will rise to the cut pressure without
overshooting the mark.
The cutting head pressures observed when the machine is actually cutting should be 3-5 KSI above the
dump orifice pressure. Dump orifice pressures are observed when the machine is traversing towards the
next cut. For example, a cutting head pressure observed at 50 KSI should see traverse pressures of
about 46 KSI.
Possible causes to a 5 KSI or greater difference in pressures include:
• Worn or chipped edges on either or both orifices.
• Mismatched orifice sizes between the cutting head and dump orifice size or setting.
• On/Off Valve needing repair.
• Manifold filter not being replaced at each pump maintenance interval.
• Last chance filter not being replaced as recommended to protect the cutting head orifice.
Two types of dump orifices are used in OMAX pumps (Figure 4-73): either a dump valve with a fixed,
replaceable orifice, or a dump valve having an adjustable dump orifice (ADO).
Figure 4-73: Two Types of Dump Valves used in OMAX Pumps
Setting the Adjustable Dump Orifice (ADO)
Follow these steps to equalize the ADO pressure with the nozzle cutting pressure.
1.
Power up both the pump and PC Controller.
2.
Open the pump’s top lid to access the knob on the ADO.
Figure 4-74: Adjustable Dump Orifice Location in OMAX Pump
KSI adjustment
knob
dump valve with adjustable orifice
dump valve with fixed orifice size
adjustable dump
orifice
Summary of Contents for JetMachining Center 2626
Page 8: ...OMAX JetMachining Center Operator s Guide viii 400433D EN ...
Page 12: ...OMAX JetMachining Center Operator s Guide xii 400433D EN ...
Page 22: ...OMAX JetMachining Center Operator s Guide Safety First 1 10 400433D EN ...
Page 140: ...OMAX JetMachining Center Operator s Guide OMAX Glossary 6 16 400433D EN ...
Page 144: ...OMAX JetMachining Center Operator s Guide Index 4 400433D EN ...