Fig. 3 Lover-Operated Two-Way Control Valve
3Plunger Return Spring
4Inlet & Exhaust Valve
5Inlet Valve Spring
When the lever is actuated in the delivery position,
the hollow plunger of the valve is depressed and makes
contact with the inlet valve and unseats it. In this
position the exhaust passage through the hollow plunger
is closed and air from the inlet port has free passage
through the two-way valve and out the delivery port to the
device being operated.
When the lever is released, the plunger is raised by
the plunger spring and the inlet valve moves to its seat
and is held closed by the inlet valve spring and inlet air
pressure. Any air pressure in line or lines connecting the
two-way valve with the device being operated will be
exhausted through the hollow plunger and exhaust
opening near the top of the valve.
Once each year or every 160,000 km (100,000
miles) the two-way valve should be disassembled and
thoroughly cleaned. Replace all grommets and inlet
valves worn or damaged in any way.
Plug one delivery port and install an air pressure test
gauge in remaining port. Install second CTS-4079 C ir
pressure gauge in the air inlet line. With air connected to
the inlet port, place the lever in applied position. The air
gauge in the delivery port should read the same as the
gauge installed in air inlet line.
With air supplied to the inlet port of the two-way
valve and the lever in released position, use Leak
Detector Tester (SE-2326) at exhaust opening at top of
the valve (where lever enters valve) to locate any leak.
Move lever or button to applied position and check
exhaust opening with Leak Detector Tester (SE-2326) to
locate leakage past exhaust plunger.
Disconnect air lines at two-way valve.
Remove machine screws securing control valve
in place and remove valve.
Install valve using the machine screws. Position
lever-operated or push button-operated two-way
valve on instrument panel with body of valve
behind instrument panel and dial or instrument
panel plate showing on front of panel.
Connect all air lines and perform tests outlined in
Press out lever or plunger roll pin.
If valve is of the push-pull type, loosen jam nut at
control button, then remove button and jam nut.
Remove plunger and plunger return spring from
Unscrew cap nut at inlet port and remove valve
spring and valve from body.
Remove grommets from plunger and cap nut.
CLEANING AND INSPECTION
Wash all metal parts in cleaning solvent.
Check plungers for damage. Hollow hole plunger
must be clean and free of all foreign material.
Inspect small end (exhaust seat) of plunger
carefully; if chipped, worn or distorted, replace.
CTS-4079 - CHAPTER VII - Page 5