DeZurik PEC 4200 매뉴얼 - 페이지 15

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Reassembly (continued)

11. Slide the packing gland down the plug stem so the four studs in the bonnet go into the holes in

the packing gland. Thread nuts onto the studs until they touch the gland, then tighten one more

turn.

Figure 7 — Location of Plug and Valve Seat While Installing Plug in Valve Body

12. Lubricate the bottom surface of the plug, then install the thrust washer to the plug bottom.

13. Lubricate the spacer, then slide the spacer onto the bottom of the plug until it contacts the thrust

washer.

14. Lubricate the o-ring groove of the lower journal cover, insert the o-ring, then lift the cover into

place making sure the spacer contacts the machined surface in the cover. Secure the cover to

the valve body with eight screws.

15. Place the keys in the plug stem keyseats. Apply RTV silicone sealant to the top of the bonnet,

then install the actuator as described in the Actuator Instructions.

16. If the valve was removed from the pipeline, reinstall it in the same orientation as originally

installed.

17. After pipeline flow is restored, check the packing for leakage. If it leaks, tighten the packing

gland nuts only enough to stop the leak. Over tightening the packing will cause premature

packing failure and higher valve operating torque.

18. Apply RTV silicone sealant to the access cover mounting surfaces, then fasten the two access

covers on the sides of the bonnet.

April 2015

3650-7200 PEC Eccentric Valves

Page 15

DeZURIK

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