DeZurik PEC 4200 Manuel - Page 12

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} DeZurik PEC 4200. DeZurik PEC 4200 18 pages. Eccentric valves

DeZURIK

3650-7200 PEC Eccentric Valves

Packing Replacement (continued)

10. Push the rings down into position with the packing gland, and replace the packing gland nuts on

the studs.

11. Turn the packing gland nuts onto the studs until they touch the packing gland, then one more

turn.

12. Restore the pipeline pressure, and check for packing leakage. If leakage occurs, tighten each

packing nut just enough to stop the leakage. Excessive tightening will cause reduced packing

life and higher valve operating torque.

13. Scrape the old RTV sealant material from the access covers and mounting surfaces, then apply

RTV silicone sealant to the access cover mounting surfaces and fasten the two access covers

on the sides of the bonnet.

The main reason to disassemble a 3650 through 7200 valve would be to replace the plug because of

damage to its rubber face. Because disassembly and reassembly are major operations, you might wish

to repair the rubber face while the valve is still fully assembled. Consult the DeZURIK factory for the

correct repair kit and procedure for your valve.

This valve was assembled at the factory using special jigs and fixtures that align the components and

hold them in position during assembly. Without the use of these fixtures, field disassembly and

reassembly are difficult and could result in damage to valve components, especially the rubber face of

the plug.

To disassemble the valve, follow these steps.

Note:

The lifting equipment used during the disassembly-reassembly must be properly sized to

handle the weight of the valve and/or components. See the "

instructions for valve and component weights.

1. Relieve pipeline pressure and close the valve.

This valve is a pressure vessel. Pipeline pressure must be completely released

before removing the actuator from the valve or the valve from the pipeline. Failure

to release pipeline pressure may result in personal injury and/or flow system

damage.

2. To disassemble the valve, it must be positioned so the plug is vertical and the bonnet is up.

3. Scribe corresponding lines on the actuator, actuator mounting plate, bonnet, plug stem and

valve body to be used for component alignment during reassembly.

4. Remove the actuator from the valve as described in the Actuator Instructions.

5. Remove the two access covers from the bonnet.

6. Remove the screws that fasten the bonnet to the valve body.

D10019

Page 12

Required Tools"

section of these

April 2015