DeZurik POWERRAC R1 Kullanım Kılavuzu - Sayfa 7
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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. The adjustable
stops are screws, secured with jam nuts, and located in the extreme ends of the actuator as shown in
Figure 4.
With a spring-to-open actuator, the closed position stop is located in the cylinder cap and the open
position stop is located in the actuator end cover.
With a spring-to-close actuator, the open position stop is located in the cylinder cap and the closed
position stop is located in the actuator end cover.
To adjust either stop:
1. Adjust the stops after the actuator is mounted on the valve—refer to valve instructions for
closed-position information.
2. Loosen the jam nut, and turn the screw counterclockwise to increase the stroke, or clockwise to
decrease the stroke.
3. After the stop is adjusted to the desired position, hold the screw from turning, and tighten the
jam nut to the torque value shown in Table A.
Table A: Jam Nut Torques
Jam Nut
1/2" Nut on 4" Cylinder Cap
5/8" Nut on 6" Cylinder Cap
5/8" Nut on End Cover
November 2020
Figure 4—Adjustable Stop Locations
Foot Pounds Newton Meters
Page 7
38 ± 5
52 ± 7
77 ± 10
104 ± 14
77 ± 10
104 ± 14
DeZURIK
D10389