DeZurik G Series Manual
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DeZurik G Series Manual

Cylinder operated actuator
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DeZURIK CYLINDER OPERATED
G-SERIES ACTUATOR
USED ON PFW & PTW TAPERED PLUG VALVES
D10191
Instruction
July 2016

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Summary of Contents for DeZurik G Series

  • Page 1 DeZURIK CYLINDER OPERATED G-SERIES ACTUATOR USED ON PFW & PTW TAPERED PLUG VALVES D10191 Instruction July 2016...
  • 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.

  • Page 3: Table Of Contents

    DeZURIK Cylinder Operated G-Series Actuator Table of Contents Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

  • Page 4: Description

    DeZURIK Cylinder Operated G-Series Actuator Description The G-Series Cylinder Actuator is a totally enclosed, quarter turn, pneumatic operated actuator. A 2" (50mm) square nut on top of the actuator is provided for manual operation. Note: Tapered Plug valves equipped with cylinder actuators do not provide dead-tight shutoff.

  • Page 5: Position Stops

    DeZURIK Cylinder Operated G-Series Actuator Position Stops Valves equipped with cylinder operated G-Series actuators have stops to limit valve travel in both the clockwise and counterclockwise directions. These stops have been adjusted at the factory to coincide with the Combination Number on the purchase order and do not require adjustment unless the Combination Number is changed, or if the actuator has been disassembled.

  • Page 6: Removing Actuator

    DeZURIK Cylinder Operated G-Series Actuator Removing Actuator When tapered plug valves are 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.

  • Page 7: Installing Actuator

    DeZURIK Cylinder Operated G-Series Actuator Installing Actuator 1. Place the valve plug in the position noted when the actuator was removed. Note: Normally this will be so the plug is in the lowest position in the valve body. 2. Line up the scribe marks on the valve and actuator made during actuator removal, then set the actuator on the valve so that the valve shaft slides into the actuator gear sector.

  • Page 8: Removing Cylinder

    DeZURIK Cylinder Operated G-Series Actuator Removing Cylinder This procedure can be performed with the actuator installed on the valve or removed. 1. Discontinue flow and relieve pipeline pressure. 2. Apply air pressure to the port in the cylinder cap (the end farthest from the actuator housing) until the valve has moved to the end of its stroke.

  • Page 9: Disassembling Actuator

    DeZURIK Cylinder Operated G-Series Actuator Installing Cylinder (Continued) 4. Screw one nut onto the rack rod. Screw the nut down until the spring washers are completely compressed, then back the nut off until the washers return to their normal shape.

  • Page 10: Reassembling Actuator

    DeZURIK Cylinder Operated G-Series Actuator Disassembling Actuator (Continued) 13. Remove the screws or nuts fastening the cylinder assembly to the housing and carefully remove the cylinder assembly by sliding it away from the actuator until the rack rod clears the actuator housing.
  • Page 11 DeZURIK Cylinder Operated G-Series Actuator Reassembling Actuator (Continued) 1. Scrape old gasket material from the actuator housing and the adapter, install a new gasket, and then fasten the adapter to the actuator housing with the screws. 2. Line up the scribe marks on the valve and adapter made during actuator removal, then set the adapter and housing on the valve.

  • Page 12: Changing Mounting Positions

    DeZURIK Cylinder Operated G-Series Actuator Reassembling Actuator (Continued) 19. Replace the extension cap. 20. Check the stop settings and readjust if necessary. The correct adjustment procedure is described in the STOP ADJUSTMENT Section of this instruction. 21. Pipeline flow may now be restored.
  • Page 13 DeZURIK Cylinder Operated G-Series Actuator Changing Mounting Positions (Continued) 8. Scribe corresponding lines on the actuator cover and housing, then remove the cover screws and cover from the top of the actuator. 9. Mark which teeth of the rack and gear are engaged and lift the gear sector out of the actuator.

  • Page 14: Troubleshooting

    DeZURIK Cylinder Operated G-Series Actuator Troubleshooting Condition Possible Cause Corrective Action Cylinder pressure is low Increase cylinder pressure. Do not exceed 100 psi (69 kPa). Actuator will not fully operate Piston seal in cylinder is leaking Replace piston seal(s). See valve Cylinder instructions.

This manual is also suitable for:

G6G12

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