*Only compressors equipped with centrifugal unloaders or
unloader-type pressure switches can use this valve. The auto tank
drain will not work with gasoline driven or continuous run units
using head unloaders.
At the end of each pumping cycle, any compressor equipped with a
centrifugal unloader or pressure switch with a pressure release
valve, exhausts air from the lines between the compressor and tank.
This exhausted air is used to actuate the Champion Automatic Tank
The exhausted air is delivered into the diaphragm cover,
depressing the diaphragm. This forces the diaphragm plate and valve
stem down, unseating the valve disc. Storage tank pressure then
forces moisture accumulation at the bottom of tank through the
flexible tube and discharges from the tank drain valve. Timer
allows the exhaust air depressing the diaphragm to bleed off. The
length of time required to bleed off air determines draining time
of the valve. The timer screw opens or closes air bleed holes,
providing the operating range necessary to assure complete
The drain valve may be mounted horizontally or vertically as
required, although must be mounted rigidly to the compressor or
tank using the mounting flange. The flange has been drilled to
accomodate 1/4" bolts. A new tank drain fitting with flexible tube
attached may be ordered, or existing manual drain fitting and tube
may be retained and used. Make sure flexible tube reaches the
bottom of the tank and connect using 1/8" or 1/4" compression
Where it is necessary to run connection into the diaphragm cover
on timer side, the timer may be unscrewed and placed on the
opposite side. When adjusting timer, the timer screw should be
turned to give draining time just long enough to exhaust all trace
of moisture. Turning the screw CLOCKWISE lengthens
discharge time, COUNTER-CLOCKWISE shortens
discharge time. Tighten lock nut when timer screw is set.
IF VALVE FAILS TO OPEN: Check for leaks
in line from unloader or pressure release valve to automatic drain
valve. Check to see that timer has not been unscrewed too far. If
trouble persists, remove intake plug and clean chamber. If this
fails, remove diaphragm cover and check the diaphragm and diaphragm
plate for cause of non-operation.
IF VALVE FAILS TO CLOSE: Check timer
adjustment to see that air is bleeding out. If air continuously
bleeds from timer while compressor is running, centrifugal unloader
or pressure switch release valve is leaking. Check compressor or
pressure switch literature/instructions for remedy. If air
continuously bleeds from timer when compressor is not running,
inspect the compressor check valve. Replace and/or clean check
valve if air is leaking back from tank.
If timer works correctly and valve fails to close, remove intake
plug, spring and valve stem assembly. This assembly includes the
valve stem, o-ring, disc and nut. They are not attached to the
diaphragm plate and will drop out through the bottom of valve
chamber opening. Clean intake chamber and disc and replcae if disc
is scored. If valve opens and only air is exhausted, check flexible
tube in tank. It must reach the bottom of the tank and be free of
leaks. Timer may be adjusted under operating conditions.
Shut off and lock out/tag out compressor. Drain tank completely
of air and water before installing or servicing valve. Failure to
relieve pressure may cause injury and/or equipment damage.
Disconnect auto drain from receiver at the bottom fitting. Remove
intake plug and clean screen which may become clogged with scale or
debris from tank. Unless the fitting and screen are kept clean,
debris may work into the drain valve seat, causing the valve to
stick or fail to close.