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- Page 1 DEZURIK R1 POWERRAC® SPRING-RETURN ACTUATOR USED ON ½ - 3” PEC ECCENTRIC VALVES D10389 Instruction November 2020 DeZURIK, Inc. Sartell, Minnesota USA | Phone: 320-259-2000 | www.dezurik.com | info@dezurik.com...
- Page 2 Safety label(s) on the product indicate hazards that can cause injury or death. If a safety label becomes difficult to see or read, or if a label has been removed, please contact DeZURIK for replacement label(s). Personnel involved in the installation or maintenance of valves should be constantly alert to potential emission of pipeline material and take appropriate safety precautions.
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Page 3: Table Of Contents
DeZURIK Table of Contents Description- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -... -
Page 4: Description
The R1 PowerRac® Spring-Return Actuator is a quarter-turn enclosed rack and gear cylinder actuator. The R1 PowerRac® Spring-Return Actuator is used for on-off or modulating control on ½"–3" PEC Eccentric Valves. The R number designates the 1" radius of the actuator gear. A choice of 4" and 6"... -
Page 5: Installation
DeZURIK Installation All cylinder port connections are 1/4" NPT. The spring-return actuator requires one pneumatic connection as shown below. Spring-to-Close With a spring-to-close spring actuator, air to the connection drives the actuator counterclockwise, towards the “open” position on the dial. -
Page 6: Operation
DeZURIK Operation The R1 PowerRac® Spring-Return Actuator is powered pneumatically, and rotates 90° between the open and closed positions, in the direction as described in the “Installation” section. The spring-return cylinder is sized for a 60 psi (415 kPa) spring only, and is limited to 100 psi (690 kPa) maximum. -
Page 7: Position Stops
DeZURIK Position Stops The adjustable open and closed position stops prevent the actuator from rotating beyond the open and closed positions of the valve. If the actuator is factory-mounted on the valve, the stops are preset and do not require further adjustment. If the actuator is not factory-mounted on the valve, or if the actuator is removed or disassembled, the stops will require adjustment as described below. -
Page 8: Removing Actuator
DeZURIK Removing Actuator Refer to Figures 5 and 6 for component identification. Flow in the pipeline with the actuator power disconnected can allow the valve to slam closed and cause personal injury and/or damage to the flow system. Shut down the flow in the pipeline before disconnecting the actuator power. - Page 9 DeZURIK Figure 5—Actuator Assembly, Less Cylinder November 2020 Page 9 D10389...
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Page 10: Spring-Return Cylinder Disassembly
DeZURIK Spring-Return Cylinder Disassembly Refer to Figure 6 for component identification. The spring assembly (S19) contains a compressed spring that can cause death or personal injury if the cylinder tie rod nuts are removed while the spring force is on the tie rod nuts. -
Page 11: Spring-Return Cylinder Reassembly
DeZURIK Spring-Return Cylinder Disassembly (Continued) Figure 6—Cylinder Assembly Spring-Return Cylinder Reassembly Clean and inspect all parts before reassembly. Refer to Figure 6 for component identification. See Figure 1 for orientation of cylinder assembly and end cover on spring-to-open and spring-to-close actuator configurations. -
Page 12: Actuator Reassembly
DeZURIK Spring-Return Cylinder Reassembly (Continued) 6. Place the piston rod seal (S3) in the cylinder head (S1). 7. Push the piston rod (S4) through the cylinder head (S1) so that the piston (S7) is against the cylinder head. 8. Place the two cylinder tube O-rings (S5) in the groove in the cylinder head (S1) and in the groove in the cylinder cap (S11). - Page 13 DeZURIK Actuator Reassembly (continued) 7. With the pneumatic connections facing upwards (towards the top of the actuator), mount the cylinder assembly (S00) and the gasket (B16) to the housing (B1). Note: For a spring-to-close actuator, use the four studs (B18) on the right-hand side of the housing, as viewed when facing the data plate (B24).
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Page 14: Mounting Actuator
DeZURIK Actuator Reassembly (Continued) 15. Tighten the jam nut (B22) finger-tight. 16. Mount the end cover (B17) and the gasket (B16) to the housing studs (B18) with the four nuts (B20) and lockwashers (B19) and tighten the nuts to 15 ± 2 foot pounds (20 ± 3 Nm). -
Page 15: Changing Actuator From Spring-Return To Double-Acting
2. Replace the actuator on the valve as described in the “Mounting Actuator” section. Lockable Model The R1 PowerRac® Single Cylinder Spring-Return Actuator is available as a lockable model that allows the actuator to be locked in either the open or closed position. The lockable model is identified by PRL in the catalog characteristic. -
Page 16: Unlocked Condition
DeZURIK Lockable Model (continued) Unlocked Condition Under normal unlocked operating conditions, both of the lock screws are backed out of the housing to allow the gear to rotate freely in either direction. To be fully disengaged, the distance from the housing to the end of each lock screw must be at least 2¼"... -
Page 17: Locked Open Condition
DeZURIK Lockable Model (Continued) 7. Place and lock the lockout cover assembly (B60) on the head of the left side lock screw. Figure 9—Locked Closed Condition Locked Open Condition Follow the steps below to change the unit from the unlocked condition to the locked open position. - Page 18 DeZURIK Lockable Model (Continued) 5. Tighten the lock screw to 5 to 10 foot pounds to assure that the lock screw is contacting the gear. 6. Turn the right side jam nut clockwise against the actuator housing. While holding the lock screw from turning, tighten the jam nut to 38 ±...
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Page 19: Troubleshooting
DeZURIK Troubleshooting Condition Possible Cause Corrective Action Adjust closed position stop. Closed position stop is set Actuator closes to wrong position incorrectly See Position Stops section. Adjust open position stop. Open position stop is set Actuator opens to wrong position incorrectly See Position Stops section. - Page 20 If you use metric fasteners with ASME Class 150/300 bolt holes and flange bolt patterns, you do so at your sole risk and any liability associated with such use shall not be the responsibility of DeZURIK, Inc. In addition to the foregoing, DeZURIK’s Manufacturer’s Conditions apply.
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