Table 10-6.--Functions of Controls and Instruments
Air supply shutoff
Used for turning on and shutting off the shop air supply to
the test stand.
Indicates the air pressure being applied to the hose
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
gauge (0-160 psi).
boost pump or the air boost pump.
Selects regulated air supply for the oil boost pump
(hydraulic testing) or the air boost pump (pneumatic
Indicates the hydraulic pressure being applied to the hoses
gauge (0-2,000 and
undergoing hydraulic test. A red follower pointer on each
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
psi oil pressure gauge when using test pressures in excess
of 2,000 psi.
before applying full hydraulic test pressures. Also used to
release hydraulic pressure in the test hoses and manifolds
Bypasses the manifolds when turned on. Used to relieve
pressure on the manifolds at the completion of test.
Fluid flow sight
Provides a means for detecting air bubbles in the hydraulic
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
the air boost pump.
Air pressure regulator. Used for setting the input air pressure to the oil boost pump
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;
it holds the test pressure and permits the air booster to be
Provides a means for releasing the air pressure in the test
hose after test.
Water shutoff valve.
Used for turning on the water to fill the pneumatic test