Emerson Fisher 3024C Manuale di istruzioni - Pagina 2

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3024C Actuator
June 2023
Table 1. Specifications
Specification
Nominal Effective Area
Maximum Operating Pressure
to Diaphragm
Maximum Travel
Yoke Boss Diameter
Valve Stem Connector Thread
Temperature Range
Pressure Connections
Maximum Approximate
Weight (without handwheel)
Maximum Approximate
Weight (with handwheel)
Figure 2. Schematic of Fisher 3024C
AIR PUSHES
STEM DOWN
SPRINGS LIFT
STEM UP
STEM
1Q57489
AIR‐TO‐CLOSE (ATC)

Description

The 3024C direct acting (extends stem/air‐to‐close) actuator (figure 8) and the reverse acting (retracts
stem/air‐to‐open) actuator (figure 9) are spring‐opposed pneumatic diaphragm actuators that provide automatic
throttling or on‐off operation of sliding‐stem control valves.
The actuator will position the valve plug in response to varying pneumatic loading pressure on the actuator
diaphragm. Figure 2 shows the operation of an ATC (air‐to‐close) actuator and an ATO (air‐to‐open) actuator.
The 3024C ATC (air‐to‐close) actuator springs are located under the diaphragm plate and they fully retract the
actuator stem for fail action upon loss of diaphragm casing pressure. The 3024C ATO (air‐to‐open) actuator springs are
located on top of the diaphragm plate and they fully extend the actuator stem upon loss of diaphragm casing pressure.
The actuator is mounted on the valve by means of a cast yoke.
The 3024C can be equipped with a side mounted handwheel if required (figure 10). An adjustable up travel stop can
also be fitted (figures 11 and 12).
2
30
30E
Bar
psig
mm
16
‐ ‐ ‐
Inch
‐ ‐ ‐
0.75
Inch
2‐1/8
2‐1/8
(mm)
(54 mm)
(54 mm)
mm
M12 x 1.75
‐ ‐ ‐
Inch
‐ ‐ ‐
3/8‐24
_C
_F
Inch
kg
9.5
9.5
lb
20.9
20.9
kg
16.5
16.5
lb
36.4
36.4
SPRINGS PUSH
STEM DOWN
AIR LIFTS
STEM SEAL
STEM UP
STEM
AIR‐TO‐OPEN (ATO)
Actuator Size
34
34E
See tables 2 and 3.
6
87
16
‐ ‐ ‐
‐ ‐ ‐
0.75
2‐1/8
2‐1/8
2‐13/16
(54 mm)
(54 mm)
(71 mm)
M12 x 1.75
‐ ‐ ‐
M16 x 2
‐ ‐ ‐
3/8‐24
Nitrile diaphragm and steel studs and nuts: -40 to +82
Nitrile diaphragm and steel studs and nuts: -40 to +180
1/4 – 18 NPT
18.0
18.0
39.7
39.7
25.0
25.0
55.1
55.1
Figure 3. Fisher 3024C Actuator Nameplate
1Q574760
Instruction Manual
40
40E
45
32
‐ ‐ ‐
32
‐ ‐ ‐
2
‐ ‐ ‐
2‐13/16
2‐13/16
(71 mm)
(71 mm)
‐ ‐ ‐
M16 x 2
‐ ‐ ‐
1/2‐20
‐ ‐ ‐
19.5
21.5
33.5
43.0
47.4
73.9
26.5
28.5
40.5
58.4
62.8
89.3
D103048X012
45E
‐ ‐ ‐
2
2‐13/16
(71mm)
‐ ‐ ‐
1/2‐20
35.5
78.3
42.5
93.7