DeZurik P41D Instruction - Page 6

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DeZURIK

Maintenance

(continued)

11. Replace any worn components, then install the spool into the valve body,.

12. Fasten the valve body to the positioner housing and tighten the screws evenly.

13. Place the indicator in the position noted in Step 6, and secure with the screw.

14. Install the side frame and the positioner cover.

15. Connect the tubing from the cylinder to the positioner.

16. Connect supply air and instrument signal to the positioner.

Cleaning the Restriction Plug

1. Remove the restriction plug. (See Figure 2.)

2. Clean the restriction hole (drilled crosswise through the restriction plug) with a fine (0.007inch

diameter) wire.

Note: Do not enlarge the restriction hole.

3. Inspect the O-rings, then install the restriction plug.

4. Install an in-line air filter in the positioner supply port.

Note: Contact the DeZURIK Parts Department to order the filter.

These instructions are written for a unit that is piped to Open the valve on an increasing signal. If your

unit is piped to Close the valve on an increasing signal, the valve action will be the opposite of what is

described here.

If valve position feedback is transmitted through a linkage rod, adjust the length of the rod as follows:

1. Remove the top cover and side frame from the positioner body before adjusting.

2. Set the positioner input signal at the minimum value of its range; for example, 4mA for a 4-

20mA range.

D10112

Figure 2 – Restriction Plug Location

Page 6

August 2012