Vertical Express I-2 Manual page 64

Reference Material
Sequence of Events
(continued)
Manual Lowering
Down Stop
TANK
62
The manual lowering valve is parallel to the down slow solenoid and, when opened, lowers
the car at leveling speed during emergencies.
1. The down slow solenoid de-energizes, stopping all flow to the tank and stopping the
car.
2. Pressure from the jack and the spring causes the piston to close. See Figure 13.
3. The down stop adjustment controls the rate of closing and the smoothness.
PUMP JACK
Figure 13 - Down Stop Diagram
Lowering Piston
Lowering Speed Adjustment
Down Stop Adjustment
Check Valve Piston
I-2 / I-3 Valve
Down Slow Solenoid (Open)
Down Start
Adjustment
Manual Lowering
Down Slowdown
Adjustment
Down Fast
Solenoid (Open)
MAIN FLOW
CONTROL FLOW
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