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Item Designation Item Designation
1 Spindle 26 Spindle
2 Bushing 27 Adjustment washer
3 O-Ring * 28 Casing PA-N 2160
4 Disc 29 U-Seal-disc
5 Diaphragm * 30 Hexagon head cap screw
6
Disk
7 Nut Manual control
8 Headless pin 34 Screw connections
9 Support 35 Spindle
10 Guide complete: * 36 Housing
10.1 Guide 37 Ring
10.2
Bush
38
Headless pin
10.3 O-ring 39 Stroke indicator
10.4 Seal element 40 Leadscrew
11 Screw connector complete: * 41 Housing cover
11.1 Screw connections 42 Cheese head screw
11.2 Bush 43 Manual control support
12
Lower casing complete
44
Bridge
13
Ring
45
Cheese head screw
14 Pressure spring 46 Axial Needle Bearing
15 Pressure spring 47 Threaded bush
16 Upper casing complete 48 Bridge cover
17 Ring 49 Cheese-head screw
18 Hexagonal screw long 50 Hand wheel
19
Hexagonal screw short
51
Headless pin
20 Disk 52 Lubricating nipple
21 Hexagon nut 53 Locking bolt
22 Coupling 54 Metal
23 Cheese-head screw 55 Hexagonal screw
24 Reducing nipple 56 Gearbox complete
25
Stopper
57
Cheese-head screw
* = spare parts
Table 1: Piece List for Figs. 2 to 4
The pressure springs and the diaphragms are designed for over 1 million up-and-down strokes.
3.4 Limits of Application
The actuators are designed to be used in ambient temperatures between -30°C and +60°C. The temperature
limit is determined by the diaphragm and seal materials.
The maximum operating pressure of the actuators is 6.0 bar. To calculate the actuator force, the diaphragm
surface area is multiplied by the spring pressure or the operating pressure minus the equivalent spring
pressure.
Example: Actuator PA
-N 1080 SC with a spring range of 1.6 – 3.9 bar and an operating pressure of 6 bar
Closing power of spring with extended spindle: F = 108000 mm² * 0.16 N/mm² = 17280 N
Closing power of spring with retracted spindle: F = 108000 mm² * 0,39 N/mm² = 42120 N
Opening power by operating pressure at starting point: F = 108000 mm² * (0.6 – 0.16) N/mm² = 47520 N
Opening power by operating pressure at end point: F = 108000 mm² * (0.6 – 0.39) N/mm² = 22680 N
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