Table 4-2. Unit Troubleshooting Guide (Continued)
TEST OR INSPECTION
Safety valve leaks.
Remove valve from piping, remove end connectors, and observe valve action as the control panel emergency stop
switch is pushed in (para. 4-48).
If the valve is closed when the emergency switch is out (panel energized), replace the valve (para.4-
If the valve stays open when the emergency switch is out (panel energized), refer to electrical
When the product pressure is below 5 psig (34 kPa), even a new valve may leak until tapped slightly. This
is due to the low spring tension required in the valve for proper functioning.
Remove valve, disassemble, and check for damage in the seat area (para. 4-45).
Push valve disc in several times after reassembly. If valve disc does not move at least 0.125 Inch, replace
valve (para. 4-45). Be sure to reinstall valve with arrow down.
HIGH PRESSURE RELIEF VALVE.
Valve or gasket leaks.
Notify direct support maintenance.
AUTOMATIC ACTUATED BUTTERFLY VALVES. (MODEL WTA-060 ONLY)
An automatic actuated valve is suspected of leaking (letting water or cleaning solution through when it is closed).
Clean/flush tank overflows or clean/flush tank drops in level until no solution is left.
Make this adjustment only when the valve to be adjusted is in its closed operating position. Making this
adjustment when the ROWPU automatic control system signals the valve actuator to open will cause the
valve to work backwards (valve open when it should be closed or closed when it should be open).
Check valve adjustment.
Remove actuator from valve (para. 4-47). Do not disconnect the air tubing or electrical cable from the
valve. Loosen allen head setscrew on actuator mounting frame. Manually turn valve stem until valve is
fully closed (slot on valve stem is perpendicular to the piping). The fully closed position can be felt as the
valve stem is hard to turn when the valve disc is sealed on the valve seat. Reinstall valve actuator on
valve stem and rotate actuator mounting frame until it slides on to the locating pin. Tighten setscrew.
4-26 Change 7