1. Accumulator
4. Hydraulic cylinder
7. Gravity tank assembly
2. Pump
5. Hydraulic control valve
8. Control panel assembly
3. Cylinder support
6. Flexible hose
9. Motor controller
Figure 3-40.—Barricade hydraulic control installation.
only when the motor controller switch is set at the
AUTOMATIC position. The caution plate (8) is
located next to the vent valve (2). It cautions all
concerned to keep the vent valve open at all times
except when charging the accumulator, and contains
instructions for closing the vent valve when charging
the accumulator.
A gauge valve (3) is furnished to maintain
pressure in the accumulator when it is necessary to
remove the pressure gauge (6). The air-charging
valve (5) regulates the charging flow. The air supply
valve (4) controls the flow intake of air to the
control panel and accumulator.
The operating
instruction plate (10) contains basic operating
instructions and a piping schematic.
The accumulator has a threaded boss welded to
the top of the shell to provide for venting when
hydrostatic testing. A liquid-level sight-glass gauge
is connected to two ports on the accumulator.
The motor controller regulates the starting and
stopping of the pump motor in conjunction with the
pressure-sensing switch. The controller, operating
magnetically, provides a switch control for OFF,
AUTOMATIC, or RUN positions. The OFF
position is used when the power package is secured.
The AUTOMATIC position is used when the power
package is to be operated, and the RUN position is
used when it is necessary to bypass the
pressure-sensing switch. Protective features of the
controller include pilot circuit and motor overload
protection and undervoltage release. A white light
3-43
