DeZurik PMV P36C Manual - Halaman 14

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DeZURIK

PMV P36C and P41C Positioners

used with DeZURIK Pneumatic Actuators

Maintenance for Positioners

To remove the pilot valve for cleaning:

1. Remove the screw (1) and carefully lift out the

complete assembly (2).

2. Gently remove the spool (3) from the block.

3. Clean the parts, using methylate cleaner or

similar.

4. Blow the parts dry with compressed air.

Note: If the parts show signs of wear, replace

the assembly. Do not mix parts from other

assemblies.

5. Check the O-rings, then secure and install the

pilot valve assembly to the positioner and

secure it with the screw (1).

6. Ensure the leaf spring (4) on the balance arm (5) is properly fitted in the groove on the spool (6).

7. Check again to ensure smooth operation of the assembly.

On P41C positioners the I/P unit must be removed

to reach the diaphragm. See Figure 12.

1. Loosen screws (1), remove the diaphragm

cover (2).

2. Loosen screw (3), then remove diaphragm

(4) and washers (5).

3. When installing the diaphragm, place one

washer on each side of the diaphragm.

Ensure the raised circle on the washers is

facing the diaphragm.

4. Install the screw (3) and tighten.

5. Check the O-ring on the diaphragm cover

(2), then install and secure the cover with

screws (1).

D10327

Figure 11 – Location of Pilot Valve Spool

Figure 12 – Diaphragm Removal and

Page 14

Installation

August 2012