Principle Of Operation; Actuator With Handwheel - Emerson Fisher 585C Series Instruction Manual

585C Actuator
October 2013
Table 8. Fisher 585C Thrust (springless construction)
PISTON
ACTUATOR
AREA
SIZE
2.8
2
cm
25 168 4630
50 303 8180
60 358 9880
68 571 15700 19700 23600
80 571 15700 19700 23600
100 842 23200 29000 34800
130 1430 39400 49300 59100
PISTON
ACTUATOR
AREA
40
SIZE
2
Inches
25 26 1040
50 47 1840
60 55.5 2220
68 88.5 3540
80 88.5 3540
100 130.5 5220
130 221.5 8860
X–Indicates where the listed supply pressure will exceed the maximum thrust allowable.
1. The maximum design pressure for size 25 through 100 actuators is 10.3 bar (150 psig). The size 68 and 130 actuators are limited to 9.7 and 7.8 bar (140 and 113 psig) respectively.
2. The size 25 and 50 data is for the construction without a bias spring.
3. Minimum operating pressure for sizes 60-130 actuators is 2.4 bar (35 psig).
4. The size 68 actuator with a handwheel is limited to 40000 Newtons (9000 lb) thrust.

Principle of Operation

The 585C piston actuator (figures 2 and 3) uses a piston that moves inside the actuator cylinder. An O-ring (see figure
3) provides a seal between the piston and the cylinder.
From an equilibrium state, the actuator reacts to a force unbalance that is created by increasing supply pressure on
one side of the piston, and decreasing it on the other. This moves the piston up or down, and results in a repositioning
of the valve plug.
Actuator with Handwheel (figures 2 and 5)
The handwheel version can be used to open or close the valve manually (either during normal operation or in an
emergency), to position the valve at any point in the stroke, or to act as a travel stop.
Size 25 and 50 actuators use an integral top-mounted handwheel. See figure 5.
Size 60 to 130 actuators use a side-mounted handwheel, and come with a spring-loaded ball detent which prevents
vibration from changing the handwheel setting. Handwheels for most types are either 203 mm (8 inches) in diameter
with beveled gears or 432 mm (17 inches) in diameter with worm gears.
8
TOTAL THRUST FOR 585C
Operating Pressure, bar
3.4 4.1 4.8 5.5
Force, Newtons
5780 6940 8100 9260
10200 12300 14300 16400 18400
12300 14800 17300 19800 22200
27600 31500 35400
27600 31500 35400
40600 46400 52200
69000 78700 88500
Operating Pressure, psig
50 60 70 80
Force, Pounds
1300 1560 1820 2080
2300 2760 3220 3680
2780 3330 3890 4440
4430 5310 6200 7080
4430 5310 6200 7080
6530 7830 9140 10440 11700
11100 13300 15500 17700 19900
(1)
(3)
6.2 6.9 7.6
(2)
10400 11600 12700
20500 22500
24700 27200
39400 43300
39400 43300
58000 63900
98800 108100
(3)
90 100 110
(2)
2340 2600 2860
4140 4600 5060
5000 5550 6110
7970 8850 9740
7970 8850 9740
13100 14400
22200 24300
Instruction Manual
MAXIMUM ALLOWABLE
8.6 10.3
14500 17300
25600 30700
30900 36900
49200 55600
49200 58700
72600 86700
X X
MAXIMUM ALLOWABLE
125 150
3250 3900
5750 6900
6940 8300
11100 12500
11100 13200
16300 19500
X X
D102087X012
THRUST
Newtons
17300
31400
36900
(4)
55600
58700
86700
111200
THRUST
Pounds
3900
7050
8300
(4)
12500
13200
19500
25000