Instruction Manual
D102087X012
585C Actuator
October 2013
8
Table 8. Fisher 585C Thrust (springless construction)
ACTUATOR
SIZE
PISTON
AREA
TOTAL THRUST FOR 585C
(1)
MAXIMUM ALLOWABLE
THRUST
Operating Pressure, bar
(3)
2.8 3.4 4.1 4.8 5.5 6.2 6.9 7.6 8.6 10.3
cm
2
Force, Newtons
(2)
Newtons
25 168 4630 5780 6940 8100 9260 10400 11600 12700 14500 17300 17300
50 303 8180 10200 12300 14300 16400 18400 20500 22500 25600 30700 31400
60 358 9880 12300 14800 17300 19800 22200 24700 27200 30900 36900 36900
68 571 15700 19700 23600 27600 31500 35400 39400 43300 49200 55600 55600
(4)
80 571 15700 19700 23600 27600 31500 35400 39400 43300 49200 58700 58700
100 842 23200 29000 34800 40600 46400 52200 58000 63900 72600 86700 86700
130 1430 39400 49300 59100 69000 78700 88500 98800 108100 X X 111200
ACTUATOR
SIZE
PISTON
AREA
Operating Pressure, psig
(3)
MAXIMUM ALLOWABLE
THRUST
40 50 60 70 80 90 100 110 125 150
Inches
2
Force, Pounds
(2)
Pounds
25 26 1040 1300 1560 1820 2080 2340 2600 2860 3250 3900 3900
50 47 1840 2300 2760 3220 3680 4140 4600 5060 5750 6900 7050
60 55.5 2220 2780 3330 3890 4440 5000 5550 6110 6940 8300 8300
68 88.5 3540 4430 5310 6200 7080 7970 8850 9740 11100 12500 12500
(4)
80 88.5 3540 4430 5310 6200 7080 7970 8850 9740 11100 13200 13200
100 130.5 5220 6530 7830 9140 10440 11700 13100 14400 16300 19500 19500
130 221.5 8860 11100 13300 15500 17700 19900 22200 24300 X X 25000
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 s izes 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
The585Cpistonactuator(figures2and3)usesapistonthatmovesinsidetheactuatorcylinder.AnO-ring(seefigure
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
onesideofthepiston,anddecreasingitontheother.Thismoves 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.
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