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Summary of Contents for DeZurik PTW
- Page 1 DeZURIK 2-16" PTW & PFW TAPERED PLUG VALVES D10188 Instruction April 2015...
- Page 2 Recommended spare parts are listed on the assembly drawing. These parts should be stocked to minimize downtime. Order parts from your local DeZURIK sales representative, or directly from DeZURIK. When ordering parts, please include the 7-digit part number and 4-digit revision number (example: 9999999R000) located on the data plate attached to the valve assembly.
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Page 3: Table Of Contents
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Table of Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -... -
Page 4: Description
Combination Number. See the Product Bulletin for these valves for a complete description of the Combination Numbers. 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: Packing
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Lubrication (Continued) Packing Packing lubrication requirements are dependent upon the packing material. • PTFE P : Requires no lubrication. ACKING • ALL PACKING OTHER THAN PTFE: Apply a light coat to the inside and outside diameters of the packing rings using one of these lubricants. -
Page 6: Fusion/Powder Coated Valves
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Fusion/Powder Coated Valves Valves with fusion/powder coated exterior paint require flat washers to be installed under the flange nuts when installing the valve to the pipeline flange to prevent the paint from cracking or chipping. - Page 7 DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Packing Replacement (Continued) When a tapered plug 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.
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Page 8: Disassembly
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Disassembly Follow these steps to disassemble valve: This valve is a pressure vessel. The bonnet will blow off the actuator if the bonnet bolts are removed with pressure in the valve. Pressure must be completely released before disassembly. -
Page 9: Reassembly
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Disassembly (Continued) 11. Reaching through the packing chamber in the bonnet, drive the upper bearing out of the bonnet using a hammer and pin punch. 12. Remove the lower bearing from the valve body. -
Page 10: Removing Valve From Pipeline
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Reassembly (Continued) 10. If the actuator is a powered actuator, reconnect power to the actuator. 11. After pipeline flow is restored, check the packing for leakage. Note: If packing 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. -
Page 11: Troubleshooting
DeZURIK 2-- - 16" PTW & PFW Tapered Plug Valves Troubleshooting Symptom Possible Cause Corrective Action Packing is loose. Adjust Packing. Packing Leaks. Packing is worn. Replace Packing. Open the valve completely Object is wedged to flush object. between plug and seat. -
Page 12: Limitation Of Liability
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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