DeZURIK
R3 PowerRac
TM
Cylinder Actuator
August 2016
Page 11
D10359
Mounting Actuator on Valve
(Continued)
3.
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.
4.
Assemble the four actuator mounting screws (B26) with lockwashers (B27) up through the
mounting holes in the top of the valve (or the actuator adaptor on the valve), through the
gasket (B28), and into the threaded holes in the bottom of the actuator. Tighten the screws
finger tight— so that the valve and actuator mounting surfaces are in contact, but are free to
slide and self-center during the next step.
5.
Tighten the adjusting screw (B9A) to 200 ± 30 foot pounds (271 ± 41 Nm).
6.
Tighten the actuator mounting screws (B26) to 318 foot pounds minimum, (431 Nm).
7.
Loosen the adjusting screw (B9A).
8.
Re-tighten the mounting screws (B26) to 318 foot pounds minimum (431 Nm).
9.
Tap the adjusting screw with a rubber mallet so that the gear (B8) bottoms out against the
lower housing bearing (B2).
10.
Begin to tighten the adjusting screw (B9A); as the adjusting screw becomes snug, repeat step
9, and finish tightening to 200 ± 30 foot pounds (271 ± 41 Nm).
11.
Tighten the jam nut (B30)
counterclockwise
to 200 ± 30 foot pounds (271 ± 41 Nm).
12.
Adjust the open and closed position stops as explained in the
Open and Closed Position
Stops
section.
13.
Operate the actuator and valve three full cycles to demonstrate that the unit operates
smoothly in both directions. Do not exceed 100 psi (690 kPa) in the cylinder.
Changing Mounting Position of Actuator on Valve
The actuator may be mounted on the valve in any one of the mounting positions shown on the
Installation Drawing. The mounting position may be changed as follows:
1.
Remove the actuator from the valve as described in the
Removing Actuator From Valve
section.
2.
Replace the actuator on the valve as described in the
Mounting Actuator On Valve
section.
Lockable Model
The R3 PowerRac Cylinder 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.
As shown in Figure 4, the lockable model includes two lock screws (B64) and two jam nuts (B65). In the
locked position, the screws engage with mating notches in the gear (B8). A lockout cover assembly
(B60) is also included.
