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Summary of Contents for DeZurik POWERRAC R3
- Page 1 DeZURIK R3 POWERRAC CYLINDER ACTUATOR D10359 Instruction August 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.
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Page 3: Table Of Contents
DeZURIK R3 PowerRac Cylinder Actuator Table of Contents Description ..........................4 Installation ..........................4 Operation ........................... 4 Lubrication ..........................4 Open and Closed Position Stops ....................4 Removing Actuator From Valve ....................7 Actuator Disassembly ......................... 7 Actuator Reassembly ......................... 8 Mounting Actuator on Valve ..................... -
Page 4: Description
DeZURIK R3 PowerRac Cylinder Actuator Description The R3 PowerRac Cylinder Actuator is a quarter-turn double-acting enclosed rack and gear cylinder actuator. The actuator is used for on-off or modulating control of butterfly valves and other valves that have a square or double-D shaft connection. A choice of an 8" (200 mm) or a 10" (250 mm) diameter cylinder is offered. - Page 5 DeZURIK R3 PowerRac Cylinder Actuator Figure 1 - Component Identification, Unassembled August 2016 Page 5 D10359...
- Page 6 DeZURIK R3 PowerRac Cylinder Actuator Figure 2 - Component Identification, Assembled D10359 Page 6 August 2016...
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Page 7: Removing Actuator From Valve
DeZURIK R3 PowerRac Cylinder Actuator Open and Closed Position Stops (Continued) • With an 8" (200 mm) cylinder, tighten the closed position stop nut (3/4") to 140 ± 18 foot pounds (190 ± 24 Nm); tighten the open position stop nut (7/8") to 230 ± 30 foot pounds (312 ± 41 Nm). -
Page 8: Actuator Reassembly
DeZURIK R3 PowerRac Cylinder Actuator Actuator Disassembly (Continued) Remove the tie rod nuts (B56) and washers (B55) from the tie rods (B54), and remove the cylinder cap (B50). Remove the piston rod (B42)— with piston (B46) and cylinder tube (B49)— from the cylinder head on the housing (B1). - Page 9 DeZURIK R3 PowerRac Cylinder Actuator Actuator Reassembly (Continued) Steps 8 through 18 apply to reassembly of the housing components. Clean and inspect all parts before reassembly. Worn parts, especially sealing components such as O-rings, other seals, and gaskets should be replaced. Before housing reassembly, apply a paint-like coating using one of these...
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Page 10: Mounting Actuator On Valve
DeZURIK R3 PowerRac Cylinder Actuator Figure 3 – Collet Assembly Mounting Actuator on Valve Refer to Figures 1 and 2 for component identification. Select one of the available actuator-to-valve mounting positions shown on the Installation Drawing. Match the open or closed position of the valve with the open or closed position of the actuator. -
Page 11: Changing Mounting Position Of Actuator On Valve
DeZURIK R3 PowerRac Cylinder Actuator Mounting Actuator on Valve (Continued) Certain high-temperature valves include and require a high-temperature gasket (B28). If the valve includes a gasket, use the gasket included with the valve rather than the gasket included with the actuator. Place the gasket between the actuator and the valve; engage the actuator with the valve shaft in the desired mounting position as determined in step 1, and slide the actuator onto the valve shaft. -
Page 12: Unlocked Condition
DeZURIK R3 PowerRac Cylinder Actuator Lockable Model (Continued) The two lock screws (B64) must be in either the unlocked or the locked position as described in the following sections. The gear (B8) will be damaged if either of the stop screws is placed in an intermediate position between the unlocked and locked positions. - Page 13 DeZURIK R3 PowerRac Cylinder Actuator Adjust only the right-side lock screw to lock the actuator in the open position. Adjusting the wrong screw does not lock the actuator, and can result in personal injury or equipment damage. Loosen the jam nut (B65) on the right side lock screw (B64), as viewed when facing the top of the heads of the lock screws.
- Page 14 DeZURIK R3 PowerRac Cylinder Actuator Figure 4 – Lockable Model, Component Identification D10359 Page 14 August 2016...
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Page 15: Troubleshooting
DeZURIK R3 PowerRac Cylinder Actuator Troubleshooting Condition Possible Cause Corrective Action Adjust closed position stop. Actuator closes to Closed position stop is set wrong position incorrectly OPEN AND CLOSED STOPS. Actuator opens to Open position stop is set Adjust open position stop. See...
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