KMT STREAMLINE SL-V SRP 100, Operation And Maintenance Manual

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Section 9
High Pressure Water System
20428754
7-2007/Rev 03
9-2
9.2 Operation
The directional control valve sends pressurized hydraulic oil to one side of the hydraulic cylinder.
The pressurized oil pushes against the piston, moving it in one direction until it activates the
proximity switch at the end of the stroke. The hydraulic flow is then sent to the opposite side of
the cylinder, and the piston reverses direction until it activates the proximity switch at the
opposite end of the stroke.
The green light on the proximity switch indicates there is power to the switch. The red light
illuminates when the switch is activated. The proximity switches are magnetically activated by
the presence of the metallic surface of the piston. When the switch is activated, it sends a signal
to the PLC to change the flow of the directional control valve and reverse direction.
As the pressurized oil pushes the piston in one direction, the plunger on that end extends and
pushes against the water in the high pressure cylinder, increasing the pressure up to 35,000 psi
(2,413 bar). When the piston reverses direction, the plunger retracts and the plunger in the
opposite cylinder extends to deliver the high pressure water.
Figure 9-2: High Pressure Cylinder
Low pressure water is routed through the inlet water ports to the inlet passages in the sealing
heads. When the plunger retracts, the inlet check valve opens to allow water to fill the high
pressure cylinder. When the plunger extends to create high pressure water, the inlet valve closes
to seal the inlet passage and the discharge check valve opens to allow the high pressure water to
exit the cylinder. As the plunger retracts, the discharge check valve closes.
INLET
WATER
PASSAGE
DISCHARGE CHECK
VALVE
INLET
CHECK VALVE
SEALING HEAD
INLET
WATER PORT
OUTLET
WATER PASSAGE
HYDRAULIC
OIL IN
EXTENDED
PLUNGER
HYDRAULIC
PISTON
RETRACTED
PLUNGER
HIGH PRESSURE
CYLINDER
HYDRAULIC CYLINDER
STEM MOUNT
2
042
967
5