Table 10-6.--Functions of Controls and Instruments
Index
Nomenclature
Function
No.
Air supply shutoff
Used for turning on and shutting off the shop air supply to
1
valve.
the test stand.
High-pressure air
Indicates the air pressure being applied to the hose
2
gauge (0-2,000 psi).
undergoing pneumatic test. A red follower pointer
indicates the maximum pressure applied to the hose. A
manual reset knob is provided for resetting the follower
pointer to zero.
Regulated air pressure Indicates the regulated air pressure being supplied to the oil
3
gauge (0-160 psi).
boost pump or the air boost pump.
Selector valve.
Selects regulated air supply for the oil boost pump
4
(hydraulic testing) or the air boost pump (pneumatic
testing).
High-pressure oil
Indicates the hydraulic pressure being applied to the hoses
5, 6
gauge (0-2,000 and
undergoing hydraulic test. A red follower pointer on each
0-20,000 psi).
gauge indicates the maximum pressure applied to the
hoses. A manual reset knob is provided on each gauge for
resetting the follower pointer to zero.
Gauge shutoff valve.
Provides a means for shutting off pressure to the 0-2,000
7
psi oil pressure gauge when using test pressures in excess
of 2,000 psi.
8
before applying full hydraulic test pressures. Also used to
release hydraulic pressure in the test hoses and manifolds
after test.
Manifold bypass
Bypasses the manifolds when turned on. Used to relieve
9
valve.
pressure on the manifolds at the completion of test.
Fluid flow sight
Provides a means for detecting air bubbles in the hydraulic
10
gauges.
oil passing from the bleed valve to the oil reservoir.
Air booster inlet valve. Used to turn on and shut off the unregulated air supply to
11
the air boost pump.
Air pressure regulator. Used for setting the input air pressure to the oil boost pump
12
during hydraulic testing to give the desired hydraulic test
pressure. Also used for setting the input air pressure to the
air boost pump during pneumatic testing to give the desired
pneumatic test pressure.
Air booster shutoff
May be turned off after pressure is built up in the test hose;
13
valve.
it holds the test pressure and permits the air booster to be
shut down.
High-pressure air
Provides a means for releasing the air pressure in the test
14
bleed valve.
hose after test.
Water shutoff valve.
Used for turning on the water to fill the pneumatic test
15
chamber.
10-17
