Flowserve StarPac 3 - Manual (Page 40)

StarPac Intelligent Control System FCD VLENIM0066-05 04/14
40
®
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power and air supply to the unit.
3. Remove the spool valve cover by removing the screw and sliding the cover assembly backwards until the tab
is clear of the slot. It is not necessary to remove the sheet metal cap, hydrophobic filter, or O-ring from this
assembly (Figure 14).
WARNING: The spool (extending from the driver module assembly) is easily damaged. Use extreme caution
when handling spool and spool valve block. Do not handle the spool by the machined portions of spool. The
tolerances between the block and spool are extremely tight. Contamination in the block or on the spool may
cause the spool to hang.
4. Remove the spool valve block by removing the two Phillips-head screws and carefully sliding the block off the
spool (Figure 14).
5. Carefully remove spool by sliding end of spool out of connecting clip. Excessive force may bend the spool.
6. Verify that the three O-rings are in the counter bores on the machined platform where the new spool valve
block is to be placed (Figure 24).
7. Carefully slide the spool into the connecting clip on the top of the driver module assembly.
8. Carefully slide the block over the spool, using the machined surface of the housing base as a register (Figure
15). Slide the block toward the driver module until the two retaining holes line up with the threaded holes in
the base.
9. Install two spool-valve screws and tighten securely with a Phillips screwdriver (See Figure 15).
10. Slide the spool valve cover assembly over the spool valve until the tang engages in the housing slot. Install
spool valve cover screw and tighten securely (see Figure 14).
11. Reconnect power and air supply to the positioner and perform a stroke calibration.
14.14 Stem Position Sensor Replacement
The position feedback assembly transmits valve position information to the processor. This is accomplished by means
of a rotary position sensor that connects to the valve stem through a feedback linkage. To provide for accurate tracking
of the pin in the slot, the follower arm is biased against one side of the slot.
To replace the stem position sensor, refer to Figure 20 and proceed as outlined below. The following tools are required:
• Phillips screwdriver
WARNING: Observe precautions for handling electrostatically sensitive devices.
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power and air supply to the unit.
3. Remove the main cover.
4. Remove the two keypad retaining screws. Carefully pull the keypad away from the main PCB board. Unplug
the keypad ribbon cable from the main PCB board and remove the keypad.
5. Remove the main PCB assembly by following the instructions in section 14.15 of this manual.
STOP!
STOP!