Flowserve 3200MD User Manual download pdf (Page 21)

User Instructions - Digital Positioner 3200MD LGENIM0059-09 12/13

8 Maintenance and Repair

8.1 Driver Module Assembly

The driver module assembly moves the spool valve by means

of a differential pressure across its diaphragm. Air is routed to

the driver module from the regulator through a ﬂ exible hose. A

barbed ﬁ tting connects the ﬂ exible hose to the driver module

assembly. Wires from the driver module assembly connect the

hall effect sensor and the piezo valve modulator to the main PCB

assembly.

Driver Module Assembly Replacement

To replace the driver module assembly, refer to Figures 11-15 and 25

and proceed as outlined below. The following tools are required:

• Flat plate or bar about

⁄8" thick

• Phillips screwdriver

• ¼ " nutdriver



WARNING: Observe precautions for handling electrostatically

sensitive devices.

Make sure the valve is bypassed or in a safe condition.

2. Disconnect the power and air supply to the unit.

3. Remove the driver module cover (Figure 14), using a ﬂ at bar or

plate in the slot to turn the cover.

4. Remove the spool valve cover by removing the screw and slid-

ing the cover assembly backwards until the tab is clear of the

slot (Figure 12). The sheet metal cap, hydrophobic ﬁ lter, and

O-ring should be removed with the spool valve cover. It is not

necessary to take these parts out of the spool valve cover.

5. Being careful not to lose the nylon washer, remove the Phillips-

head screw that attaches the driver module to the main housing

(Figure 13).



WARNING: 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. Contami-

nation in the block or on the spool may cause the spool to

hang.

6. Remove the spool valve block by removing the two Phillips-head

screws and carefully sliding the block off the spool (Figure 13).

7. Carefully remove the spool by sliding the end of the spool out of

the connection clip. Excessive force may bend spool.

8. Remove the main cover.

Figure 11: Driver Module Assembly

Figure 12: Spool Valve Cover Assembly

Screw

Spool Valve Cover

Pressure Sensor Board

Hall Sensor

Connection

Pressure

Modulator

Connection

O-ring

Driver Module

Assembly

Analog

Output

Board

Connection

Analog

Output Board

Install Barbed Fitting after

Driver Module is in housing

Hall Sensor Connector

Pressure Modulator Connector

Position wires

to the rear

of Modulator

Regulator

Pressure Sensor

Board Connection

User Interface

Board Connection

Stem Position

Sensor

Connection

Main PCB

Retaining

Screw

Spool Valve

Screw

Nylon

Gasket

Driver to

Housing Screw

Spool

Valve

Block

Housing

Figure 13: Spool and Block

Barbed Fitting

Flat on

Housing

Flat on

Driver

Module

Driver Module Cover

Figure 14: Driver Module Barbed Fitting

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