Vertical Express I-2 Manual page 59

I-2 / I-3 Valve
Sequence of Events
(continued)
High-pressure Relief
Relief Pressure Adjustment Screw
Up Slow Solenoid
(Closed)
Up Slowdown
Adjustment
Pressure Control
Piston
Up Stop Adjustment
Up Pilot Piston
Up Fast Solenoid (Open)
Up Start Adjustment
Up Leveling Speed Adjustment
August 2019 - 89130 v.3.0
1. The oil is transmitted to the high-pressure pilot. See Figure 8.
2. The movement allows the oil in back of the regulator piston and at the high-pressure
adjustment to escape to the tank.
3. The regulator piston moves rapidly to the low-pressure stud, allows full bypass from
the pump to the tank, and relieves the excess pressure.
4. The system maintains relief pressure as long as the pump continues to run.
High-Pressure
Relief Pilot
Low
Pressure
Adjustment
Figure 8 - High-Pressure Relief Diagram
TANK
Regulator Piston
PUMP
Check Valve Piston
Reference Material
MAIN FLOW
CONTROL FLOW
JACK
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