DeZurik PEC Manual
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DeZurik PEC Manual

20.5–36" eccentric valves
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DeZURIK 20.5–36" PEC
ECCENTRIC VALVES
D10032
Instruction
April 2015

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Summary of Contents for DeZurik PEC

  • Page 1 DeZURIK 20.5–36" PEC ECCENTRIC VALVES D10032 Instruction April 2015...
  • Page 2 DeZURIK 20.5 - 36" PEC Eccentric Valves Instructions These instructions provide information about PEC Eccentric Valves. They are for use by personnel who are responsible for installation, operation and maintenance of PEC Eccentric Valves. Safety Messages All safety messages in the instructions are flagged with an exclamation symbol and the word Caution, Warning or Danger.

  • Page 3: Table Of Contents

    DeZURIK 20.5 – 36" PEC Eccentric Valves Table of Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

  • Page 4: Description

    Clockwise rotation of the valve stem closes the valve. If an actuator other than a DeZURIK is to be mounted, the actuator must be capable of maintaining the valve plug position with flow in the pipeline.

  • Page 5: Fusion/Powder Coated Valves

    DeZURIK 20.5 – 36" PEC Eccentric Valves Installation (continued) Suspended Solids If the pipeline carries suspended solids such as paper stock of 2 percent or higher consistency, mining slurry, or raw sewage: 1. Before installation, remove foreign material such as weld spatter, oil, grease, and dirt from the valve and pipeline.

  • Page 6: Closed Position

    DeZURIK 20.5 - 36" PEC Eccentric Valves Closed Position Because of the eccentric action of this valve, the closed position of the valve is dependent upon the pressure drop expected when the valve is closed. To adjust the valve closed position, follow these steps: 1.

  • Page 7: Plug Journals And Lubrication

    DeZURIK 20.5 – 36" PEC Eccentric Valves Lubrication (continued) Plug Journals and Lubrication Plug journal lubrication is dependent upon the materials used in construction of the valve. • and N : Lubricate the journals on the plug using one of...

  • Page 8: Packing Adjustment

    DeZURIK 20.5 - 36" PEC Eccentric Valves Packing Adjustment To stop packing leakage, tighten the gland nuts uniformly until the leak stops. Note: Do not continue tightening after leak stops. If the leak cannot be stopped by tightening the gland nuts, replace the packing.

  • Page 9: Replacing Packing Without Removing Actuator

    DeZURIK 20.5 – 36" PEC Eccentric Valves Packing Replacement (continued) 8. Lubricate the new packing, then install it one ring at a time as shown in Figure 3. Figure 3—Correct Packing Installation Sequence 9. Slide the packing gland down the valve shaft and over the studs.

  • Page 10: Disassembly

    DeZURIK 20.5 - 36" PEC Eccentric Valves Packing Replacement (continued) 3. Remove the packing gland nuts from the studs, and slide the packing gland up the stem of the plug. 4. Remove the studs from the bonnet. 5. Cut and completely remove all of the old packing from the packing chamber in the bonnet.

  • Page 11: Reassembly

    DeZURIK 20.5 – 36" PEC Eccentric Valves Disassembly (continued) When an eccentric valve is mounted in a vertical pipeline— or mounted in a horizontal pipeline with the plug stem horizontal—gravity can cause the plug to swing to a lower position in the valve body when the actuator is removed. Place the plug in the lowest position before removing the actuator.

  • Page 12: Removing Valve From Pipeline

    DeZURIK 20.5 - 36" PEC Eccentric Valves Removing Valve from Pipeline To remove the entire valve assembly from the pipeline, follow these steps. This valve is a pressure vessel. Failure to release pipeline pressure may result in personal injury and/or flow system damage. Completely release pipeline pressure before removing the actuator from the valve or removing the valve from the pipeline.

  • Page 13: Troubleshooting

    DeZURIK 20.5 – 36" PEC Eccentric Valves Troubleshooting Symptom Possible Cause Corrective Action Adjust Packing. Packing is loose. (See Packing Adjustment section) Packing Leaks. Replace Packing. Packing is worn. (See Packing Replacement section) Completely open the valve to flush object from the valve.
  • Page 14 No claim for transportation, labor or special or consequential damages or any other loss, cost or damage shall be allowed. You shall be solely responsible for determining suitability for use and in no event shall DeZURIK, Inc. be liable in this respect.

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