AUTOMATIC VALVES
TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE (MODEL WTA-060 ONLY)
The automatic valves on the ROWPU are sping loaded open and air pressure closed. The
electrical system controls whether air is, or, is not supplied to the valve. In the event of an
electrical circuit or air system failure the valves will automatically open. The actual
position of a valve can be determined by removing the plastic valve cap and observing
the position of the stem: if the stem isextended out from the top of theactuator housing,
it is closed; if it is sitting on the top of the actuator housing, it is open.
CAUTION (MODEL WTA-060 ONLY)
Whenever an automatic valve assembly (valve and actuator) is removed from the piping
it must be reinstalled with the valve disc open. Attach the air tubing and electrical
connector after the valve assembly is installed in the piping, If the actuator is removed
from the valve it must be reinstalled with its air and electrical connection removed from it.
Additionally, the maintainer must determine that the valve itself is open. This can be done
either by removing the valve from the piping to check it, or, by looking at the bottom of
the valve housing and noting the position of thegroove on the end of the valve stem. The
groove is in alignment with the inner valve disc. Turn the square end of the valve stem a
quarter turn to make the groove point towards the inlet/outlet openings on the valve and
then install the actuator. Failure to follow these procedures will result in the valve
operating opposite to what it was meant to do in the system.
CAUTION
(MODEL ROWPU-1 ONLY)
Whenever an automatic valve assembly (valve and actuator) is removed from the piping,
it must be reinstalled with the valve disc open. Attach the air tubing and electrical
connector after the valve assembly is installed in the piping.
If the actuator is removed
from the valve it must be reinstalled with its air and electrical connection removed from
it. Additionally, the maintainer must determine whether the valve itself is open. The
actual position of the valve can be determined by looking at the position indicator at the
bottom of the actuator.
NOTE
(MODEL ROWPU-1 ONLY)
The automatic valves on the ROWPU are spring loaded open and air pressure closed.
The electrical system controls whether air is, or, is not supplied to the valve. In the event
of an electrical circuit or system failure the valves will automatically open. The actual
position of the valve can be determined by looking at the position indicator at the bottom
of the actuator.
2-34
Change 3
