TM 1-1740-204-13&P
d.
G1, Tank Pressure Gauge. This gauge indicates the pressure remaining in the nitrogen supply tanks. The
gauge is 2-1/2 inches in diameter and has a 3,000 psi scale and 2-1/2% full scale accuracy.
e.
G2, Regulated Low Pressure Gauge. This gauge indicates the output pressure of regulator R1 which is
provided to connector C4 and to drive the booster pump. The gauge is 2-1/2 inches in diameter and has a 300
psi scale and 1% full scale accuracy.
f.
G3, Pump Outlet Pressure Gauge. This gauge indicates the output pressure of the booster pump P. The
gauge is 2-1/2 inches in diameter and has a 5,000 psi scale and 2-1/2% full scale accuracy.
g.
G4, Regulated High Pressure Gauge. This gauge indicates the output pressure of regulator R2 that is being
supplied to connector C5. The gauge is 2-1/2 inches in diameter and has a 5,000 psi scale and 1% full scale
accuracy.
h.
V1, Pump Drive Valve. This valve turns 'on' and shuts 'off the flow of shop air applied at connector C3 or
nitrogen from the tanks to the booster pump, P. Turning the handle in-line with the tubing turns the valve 'on' for
flow. Turning the valve handle perpendicular to the tubing will shut 'off' flow.
i.
V2, High Pressure Vent Valve. This vent valve, when open, vents the line pressure contained between
regulator, R2, and shut off valve, V3. This is a soft needle seat valve and is actuated by turning the handle
clockwise to shut the valve and counter clockwise to open the valve.
j.
V3, High Pressure Shut-Off Valve. This valve turns 'on' and shuts 'off' the regulated high pressure output from
the high pressure regulator, R2, to connector C5.
k.
V4, High Pressure Shut-Off Valve. This valve turns 'on' and shuts 'off' the regulated high pressure output at the
high pressure charging hose connector, C6. It is used to control the flow when actually charging an aircraft
accumulator or strut.
I.
SV2, High Pressure Relief Valve. The adjustable high pressure relief valve has a range of 2,000 psi to 4,000
psi. It is provided to limit the high pressures generated in the booster pump system and has a mechanical stop
limiting the maximum pressure to 4,200 psi.
2-5
