types of regulators are used with the A/M26U-4. They
MANIFOLD.--The manifold (18) provides a
both serve the same purpose, but their operating
common connecting point for all of the cylinders. It is a
procedures are slightly different. Always check the
split type that incorporates a bypass valve (6).
appropriate technical documentation for the regulator
MANIFOLD BY-PASS VALVE.--The manifold
that you are using.
bypass (6) valve connects the two sections of the
OUTLET PRESSURE GAUGES.--The outlet
manifold. It is used when recharging the cylinders. It
pressure gauges (13 and 14, low-pressure and
must be closed at all times except when recharging or
high-pressure, respectively) indicate the pressure in
when using air drive.
the servicing hose. The low-pressure gauge (13) has a
LEVER CONTROL VALVES.--The lever
range of 0 to 600 psi for servicing low-pressure (0 to
control valves (4 and 5), attached to the manifold,
500 psi) systems. A cutout (27) is incorporated to
control the flow of nitrogen from the cylinders into the
prevent damage to the low-pressure gauge when the
manifold. There is a valve for each of the six cylinders.
pressure regulator is adjusted to a pressure exceeding
Four of the valves are painted green and two of them
the range of the gauge. The high-pressure gauge (14)
are painted red. The green lever control valves (4)
has a range of 0 to 3,500 psi for servicing high-pressure
control the flow of nitrogen from cylinders G1 through
systems (500 to 3,500 psi).
G4 for direct servicing from the cylinders and for
SERVICING LINE VALVE.--The servicing
motor operation. The red lever control valves (5)
line valve (2) admits nitrogen into the servicing line
control the flow of nitrogen from cylinders R1 and R2
(1), and vents pressure from the servicing line after a
for the pump system.
C Y L I N D E R P R E S S U R E G AU G E S . -- T h e
PUMP INLET VALVE.--The pump inlet valve
cylinder pressure gauges (3) indicate the nitrogen
(8) controls the flow of nitrogen from the manifold to
pressure remaining in the cylinders. The gauges are
the suction side of the pump.
attached to the lever control valves (4 and 5) in such a
manner that they display cylinder pressure
MOTOR INLET SELECTOR VALVE.--The
continuously, even when the valves are closed.
motor inlet selector valve (7) controls the flow of
M A N I F O L D S H U T O F F VA LV E . -- T h e
nitrogen from the manifold (18) through the motor
manifold shutoff valve (10) controls the flow of
regulator (25) to the motor, and it controls the flow of
nitrogen from the manifold to the pressure regulator
low-pressure air from the external air connection (11)
(17) via the purifier (24) and filter (23). A check valve
through the motor regulator (25) to the motor. The
is installed in line with and on the service side of the
motor inlet selector valve has three operating
manifold shutoff valve to prevent reverse flow.
PURIFIER.--The purifier (24) removes foreign
MOTOR REGULATOR.--The motor regulator
material and moisture from the gas supplied by the
(25) is a preset regulator that controls the amount of
nitrogen cylinders. It is a cylinder type with a
nitrogen or air going to the motor. It is located behind
and bolted to the control panel.
FILTER ASSEMBLY.--The filter assembly
MOTOR INLET PRESSURE GAUGE.--The
(23), located downstream from the purifier, traps any
motor inlet pressure gauge (16) indicates the amount of
particles that pass the purifier. The filter element is a
pressure at the outlet of the motor regulator.
5-micron microfilm type. A bypass valve with a
M OTO R A N D P U M P A S S E M B LY . -- T h e
cracking pressure of 50 psi is installed in the filter. The
motor and pump assembly (19) is used to boost
bypass valve assures continued operation of the system
delivery pressure when pressure in the cylinders is not
and protection from rupture of the element.
sufficient to satisfy the demand of the system being
M A N I F O L D P R E S S U R E G AU G E . -- T h e
serviced. Two different assemblies are currently in use.
manifold pressure gauge (15) indicates the nitrogen
One uses a single-acting pump cylinder. The other uses
pressure at the manifold side of the pressure regulator
a d o u b l e - a c t i n g p u m p cy l i n d e r. B o t h o p e r a t e
essentially the same.
Figure 9-7 shows a single-acting pump cylinder
PRESSURE REGULATOR.--The pressure
unit and illustrates how the gas-operated motor and
regulator (17) controls the pressure supplied to the
pump supply boost pressure to the system servicing
servicing hose valve (2) and servicing hose (1). Two