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Replacement for Champion ZTD1 Automatic Tank Drain Valve

Replacement for Champion ZTD1 Automatic Tank Drain Valve

Part #: ZTD1
Availability : Contact Us
Automatic Tank Drain Valve for Champion Compressors




*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 Drain Valve.

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 drainage.


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 fittings.

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.