Flowserve 3400IQ Digital Positioner - Manual (Page 58)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06

10. Slide the spool valve cover assembly over the spool valve until the tang engages into the
housing slot. Install the spool valve cover screw and tighten securely (see Figure 13).
11. Reconnect power and air supply to the positioner and perform a stroke calibration.
8.5 Spool Valve Cover
The spool valve cover incorporates a hydrophobic filter element in a two-piece cover. This protects
the spool valve chamber from dirt and moisture and provides a low back pressure vent for exhaust
air from the spool valve.
Replacing Filter in Spool Valve Cover
To replace the filter in the spool valve cover, refer to Figures 12 and 17 and proceed as outlined
below. The following tools are required:
• Phillips screwdriver
1. Remove the spool cover by removing the screw and sliding the cover assembly backwards until
the tab is clear of the slot. The sheet metal cover may be removed and cleaned with a brush or
by blowing out with compressed air (Figure 13).
2. Remove the O-ring from around the hydrophobic filter element and set aside (Figure 18).
3. Remove the molded filter element by pulling it straight out of the chamber cover vent piece.
4. Install O-ring into base of chamber cover vent piece as shown in Figure 18.
5. Place new molded filter element into the chamber cover vent piece. This filter element provides
part of the track to secure the O-ring installed in the last step.
6. Place spool valve shroud onto spool valve cover.
7. Place the spool valve cover assembly in place by setting it on the ramp and sliding it until the tab
seats in the slot (Figures 12 and 17) and secure with a 8-32 screw.
Figure 18: Spool Valve Cover Assembly
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