5/12/2017
TECH-538/D.W.O. 23160
Page 126 of 189
Spool Valve Cleaning (new standard flow manifold)
It is not recommended to service the new standard flow manifold. In normal conditions (i.e. high quality supply air,
healthy actuator) there will be minimal if any maintenance necessary on the spool valve. If unfavorable conditions
exist (i.e. poor supply air quality or if lubrication and sediment from the actuator is being exhausted through the
spool valve) it is recommended to replace the manifold or contact Westlock regarding service requests.
In extreme conditions, in case the user wants to proceed and service the manifold
, please contact Westlock before
doing in order to prevent warranties and guarantees to be voided.
The process to service it may become necessary to clean the spool valve to avoid operational failures due to valve
sticking and to maintain optimum positioner performance.
The positioner’s onboard filter should be replaced in Westlock premises whenever it gets clogged.
The filter’s original color is chalky white. A discolored filter may also indicate the need for an evaluation of the
air-supply quality.
Figure 9-8– Diagram for the air filter and spool piece removal
To clean the spool valve, the spool piece needs to be removed in Westlock premises. Prior to removing the spool,
make sure the positioner is out of service and all air pressure has been bled-off the positioner and the actuator.
The spool piece and sleeve can be cleaned using any non-chlorinated cleaning solvent. To clean the spool, use a
clean lint free cloth. To clean the I.D. of the sleeve a polyester lint free clean room swab is recommended.
Important:
do not use an abrasive cleaner on the spool or sleeve. Never buff the spool or sleeve or use
crocus cloth, and never attempt to remove the sharp edges from the spool lands. These practices will
permanently damage the spool assembly and will affect the fit and action of the spool sleeve assembly.
Important:
the spool and sleeve assembly are sold as a precision matched set.
Spools are not interchangeable. To prevent mix-ups it is recommended that only one assembly be
cleaned at a time. In case mix-up happen contact factory for additional support.
Important:
after cleaning, gently insert the spool into the sleeve. Insert straight with a slight rotating
motion. Do not cock the spool. Make sure the spool spins and moves freely. After the spool valve is
cleaned and reassembled the positioner should recalibrated using the auto CAL function.
Important: This manifold was not designed to be serviced by the end user. Any maintenance executed outside
Westlock premises or an authorized Westlock technician may void the warranty provided by Westlock and its
representatives. In case of doubt consult Westlock about the correct procedure to follow.
