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8. Maintenance/service
When service or rebuilding is required,
it may be necessary to remove and refit
various parts of the positioner. This is
described on the following pages.
Valve block
The valve block is mounted on the base
with three screws. It is sealed against the air
ducts in the base with O-rings.
Remove the valve block as follows:
• Remove the spring from its attachment hole
A in the balance arm.
• Unscrew the screws holding the block assy.
• Lift the lower edge of the valve block and
pull it away from the base in the direction of
the arrow in the figure.
• Check all the O-rings on the rear side of
the valve block and replace if necessary.
• Refit in the reverse order.
Cleanliness is essential when working
with the positioner. Contamination in
the air ducts will lead to operational
disturbances. Do not disassemble the
unit further than that described here.
Do not take the valve block apart
because its function will be impaired.
Do not remove any screws other than
those described here.
A
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