Emerson Fisher 3025 Data Sheet
Product Bulletin
3025 Actuator
D102789X012
61.1:3025
March 2012
Fisherr 3025 Sizes P462, P460-200, and P900
Diaphragm Actuator
Fisher 3025 Size P460-200, P462 and P900 spring
opposed diaphragm actuators position the valve plug
in the valve body in response to varying controller or
valve positioner pneumatic output signals appliedto
the actuator diaphragm. They can be specified as
either direct, e.g. air-to-close, or reverse acting e.g.
air-to-open(seefigure1).Theseactuatorsare
designed to provide dependable on-off or throttling
operation of automatic control valves.
ThesizeP462is available for travels up to 120 mm,
4.75 inches with air-to-open and air-to-close action.
ThesizeP460-200is available for travels up to 200
mm,8incheswithair-to-openandair-to-closeaction.
ThesizeP900is available for travels up to 120 mm,
4.75 inches with air-to-open and air-to-close action.
Features
Long Travel Capability–Suitable for valves with
valve plug travels of up to 200 mm (8 inches).
Application Versatility–Yoke boss mountings, travel
stops, and manual operators are available for nearly
any control valve requiring longer valve plug travels.
Positive Connections–Split block stem connection
provides for a solid transfer of motion while
allowing easy mounting, and it includes no linkages
to create lost motion and inaccurate valve
positioning.
W9088-2
Reversible Construction–Actuator action can be
Long Service Life–Rugged steel construction
Fisher 3025 Actuator Air-to-Open Action
easily changed on site without need of additional
parts.
provides stability and corrosion protection.
www.Fisher.com
Product Bulletin
61.1:3025
March 2012
Specifications
3025 Actuator
D102789X012
Operating Pressure Range
See tables 3 and 4
Maximum Travel
Sizes P462 and P900: 120 mm (4.75 inches)
Size P460-200: 200 mm (8 inches)
Output Indication
Stainless steel disc or pointer and graduated scale
Stroking Speed
Dependent on actuator size, travel, spring rate, initial
spring compression, and supply pressure. If stroking
speed is critical, consult your Emerson Process
Management sales office
Operating Temperature Range
-30 to 80_C
Volumetric Displacement
See table 2
Signal Connection
1/2 NPT internal
Effective Diaphragm Area
See table 4
Maximum Pressure
4barg
Construction Materials
Diaphragm Casing: Steel
Diaphragm: Nitrile on nylon
Diaphragm Plate: Steel
Actuator Spring: Steel alloy
Actuator Stem: Steel alloy
Travel Indicator: Stainless steel
Yoke: Steel
Stem and Yoke Boss Diameters
ACTUATOR
SIZE
P462 and
P460-200
P900
1. H = Heavy actuator to valve bolting.
YOKE BOSS
DIAMETER
(Inches)
3-9/16
5
(1)
5H
5
(1)
5H
STEM DIAMETER
mm Inches
19.1
25.4
31.8
25.4
31.8
3/4
1
1-1/4
1
1-1/4
Dimensions and Weights
Seetables5,6,and7andfigures3,4,and5
Options
J Side-mounted gear handwheel, J Oversize signal
connections
Available Configurations
The 3025 actuator can be supplied in either direct or
reverse action.
Direct Action
In direct action, applying air pressure to the upper
diaphragm casing forces the actuator stem downward.
When this pressure is reduced, the opposing spring
forcemovestheactuatorstemupward.Shouldthe
loading pressure fail, the spring forces the stem to the
extreme upward position. This provides fail-open
2
action for push-down-to-close valves and fail-closed
action for push-down-to-open valves.
Reverse Action
In reverse action, applying air pressure to the lower
diaphragm casing forces the actuator stem upward
against the opposing spring force. When this loading
pressure is reduced, the spring moves the actuator
stem to the extreme downward position. Should the
loading pressure fail, the spring forces the stem to the
extreme downward position. Reverse acting actuators
provide fail-closed action for push-down-to-close
valves and fail-open action for push-down-to-open
valves.
3025 Actuator
D102789X012
Figure 1. Typical Actuators
Product Bulletin
61.1:3025
March 2012
E0990
FISHER 3025 SIZE P462
AIR-TO-OPEN
FISHER 3025 SIZE P462
AIR-TO-CLOSE
3
Product Bulletin
61.1:3025
March 2012
3025 Actuator
D102789X012
Accessories
Instruments
Mounting parts exist for the following instruments
(see table 1):
Table 1. Instruments Used with Fisher 3025
Actuators
Actuator Size Travel Instruments
J FIELDVUEt DVC6200 digital
Up to 102 mm
P462 andP900
P460-200 All
(4 inches)
Over 102mm
(4 inches)
valve controller,
pneumatic positioner and
J 3582i electropneumatic
positioner
J DVC6200 digital valve
controller and
Series positioners
Table 2. Volumetric Casing Displacement
ACTUATOR
SIZE
P462
P460-200
P900
P462
P460-200
P900
1. Clearance volume indicates casing volume at zerotravel.
CLEARANCE
VOLUME
cm
8600
17400
17200
Inch
522
1062
1050
(1)
3
3
J 3582
J 3610/3620
51 76 102 120 127 152 165 178 203
17900
---
35800
2 3 4 4.75 5 6 6.5 7 8
1089
---
2186
22500
---
45100
1373
---
2755
27100
---
54400
1657
---
3323
Handwheels
A geared handwheel is available for all sizes of the
3025 Actuator to manually position the valve plug. The
valveisopenedbyturningthehandwheeltotheleft
and closed by turning to the right. See figure 2.
Other
Accessories such as transducers, position transmitters,
air relays, volume boosters, switching valves, lockable
valves, limit switches and solenoid valves are also
available for actuator mounting. They are described in
separate publications. Contact your Emerson Process
Management sales office for details.
TRAVEL, mm
Casing Volume, cm
30500
---
61200
1862
---
3735
46000
TRAVEL, inches
Casing Volume, inch
2806
---
---
---
---
3
---
51700
---
3
---
3154
---
---
54500
---
---
3329
---
---
57400
---
---
3503
---
---
63100
---
---
3852
---
4
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