Description, Instruction manual – Emerson Process Management FISHER 657 User Manual
Page 2
Instruction Manual
D100306X012
657 Actuator (30-70 and 87)
December 2010
2
Do not install, operate, or maintain a 657 actuator without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson Process Management sales office before
proceeding.
Table 1. Specifications
SPECIFICATION
(1)
ACTUATOR SIZE
30
34
40
45
46
50
60
70
(1)
87
(1)
Nominal Effective Area
cm
2
297
445
445
677
1006
677
1006
1419
1419
Inch
2
46
69
69
105
156
105
156
220
220
Yoke Boss Diameters
mm
54
54
71
71
71
90
90
90
127
Inches
2‐1/8
2‐1/8
2‐13/16
2‐13/16
2‐13/16
3‐9/16
3‐9/16
3‐9/16
5
Acceptable Valve
Stem Diameters
mm
9.5
9.5
12.7
12.7
12.7
19.1
19.1
19.1
25.4
Inches
3/8
3/8
1/2
1/2
1/2
3/4
3/4
3/4
1
Maximum Allowable
Output Thrust
(4)
N
10230
10230
12010
25131
33582
25131
30246
39142
39142
Lb
2300
2300
2700
5650
7550
5650
6800
8800
8800
Maximum Travel
(2)
mm
19
29
38
51
51
51
51
76
(3)
76
(3)
Inches
0.75
1.125
1.5
2
2
2
2
3
(3)
3
(3)
Maximum Casing
Pressure for
Actuator Sizing
(4)
Bar
8.6
4.5
4.5
3.4
2.8
3.4
2.8
3.8
3.8
Psig
125
65
65
50
40
50
40
55
55
Maximum Diaphragm
Casing Pressure
(4)(5)
Bar
9.6
5.2
5.2
4.1
3.4
4.1
3.4
4.5
4.5
Psig
140
75
75
60
50
60
50
65
65
Material Temperature
Capabilities
_C
Nitrile Elastomers: -40 to 82
_C, Silicone Elastomers: -54 to 149_C, Fluorocarbons: -18 to 149_C
_F
Nitrile Elastomers: -40 to 180
_F, Silicone Elastomers: -65 to 300_F, Fluorocarbons: 0 to 300_F
Pressure Connections
(internal)
1/4 NPT
X
X
X
X
X
X
X
‐ ‐ ‐
‐ ‐ ‐
1/2 NPT
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
X
X
Approximate Weights
kg
16
22
23
37
49
42
53
107
116
Lb
36
48
51
82
107
92
116
235
255
1. These values also apply to the 657‐4 actuator construction.
2. Actuator travel may be less than the value listed after connecting the actuator to the valve.
3. Maximum travel for 657‐4 is 102 mm (4 inches).
4. Normal operating diaphragm pressure must not exceed maximum diaphragm casing pressure and must not produce a force on the actuator stem greater than the maximum allowable out
put thrust or the maximum allowable valve stem load. Contact your Emerson Process Management sales office with questions concerning maximum allowable valve stem load.
5. This maximum casing pressure is not to be used for normal operating pressure. Its purpose is to allow for typical regulator supply settings and/or relief valve tolerances.
Description
The 657 actuator (figure 1) and the 657‐4 actuator are direct‐acting, spring‐opposed diaphragm actuators. They
provide automatic operation of control valve body assemblies. The 657 actuator offers 76 mm (3 inches) maximum
actuator travel. The 657‐4 actuator provides 102 mm (4 inches) maximum actuator travel. Both actuators position the
valve plug in response to varying pneumatic loading pressure on the actuator diaphragm. Figure 2 shows the
operation of these actuators.
A 657 or 657‐4 actuator can be equipped with either a top‐mounted or a side‐mounted handwheel assembly. A
top‐mounted handwheel assembly is used as an adjustable up travel stop to limit actuator travel in the up direction
(see figure 2). A side‐mounted handwheel assembly is usually used as an auxiliary manual actuator. Adjustable
casing‐mounted up or down travel stops are also available for this actuator.