Installation, Operation and Maintenance Manual
PBC-01102001 Rev. A
January 2001
5
Section 1: Introduction
Introduction
Pilot pressure to the pilot piston (5) illustrates force applied to the piston seating the
exhaust poppet and simultaneously unseating the power poppet. Power gas is directed
through tank port "B".
Figure 2
Pilot Activation
FIGURE 2A
TANK “A”
POWER
PILOT
EXHAUST OR
RETURN OIL
TANK “B”
5
NOTE:
Pilot pressure to the opposite pilot piston shown in Figure 2 will activate the opposite set of
poppets and direct power gas to tank port "A".
Pilot pistons are equipped with an orifice in order to vent the pilot pressure and allow the
control to neutralize after stroking an actuator.
Figure 3
High Pressure
Exhaust
Pilot Pressure
Atmospheric Pressure
