Table of Contents
Advertisement
657 Actuator (30-70 and 87)
December 2010
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
(1)
SPECIFICATION
Nominal Effective Area
Yoke Boss Diameters
Inches
Acceptable Valve
Stem Diameters
Inches
Maximum Allowable
(4)
Output Thrust
(2)
Maximum Travel
Inches
Maximum Casing
Pressure for
(4)
Actuator Sizing
Maximum Diaphragm
(4)(5)
Casing Pressure
Material Temperature
Capabilities
1/4 NPT
Pressure Connections
(internal)
1/2 NPT
Approximate Weights
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.
2
30
34
2
cm
297
445
2
Inch
46
69
mm
54
54
2‐1/8
2‐1/8
mm
9.5
9.5
3/8
3/8
N
10230
10230
Lb
2300
2300
mm
19
29
0.75
1.125
Bar
8.6
4.5
Psig
125
65
Bar
9.6
5.2
Psig
140
75
_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
X
X
‐ ‐ ‐
‐ ‐ ‐
kg
16
22
Lb
36
48
ACTUATOR SIZE
40
45
46
445
677
1006
69
105
156
71
71
71
2‐13/16
2‐13/16
2‐13/16
12.7
12.7
12.7
1/2
1/2
1/2
12010
25131
33582
2700
5650
7550
38
51
51
1.5
2
2
4.5
3.4
2.8
65
50
40
5.2
4.1
3.4
75
60
50
X
X
X
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
23
37
49
51
82
107
Instruction Manual
D100306X012
(1)
50
60
70
677
1006
1419
105
156
220
90
90
90
3‐9/16
3‐9/16
3‐9/16
19.1
19.1
19.1
3/4
3/4
3/4
25131
30246
39142
5650
6800
8800
(3)
51
51
76
(3)
2
2
3
3.4
2.8
3.8
50
40
55
4.1
3.4
4.5
60
50
65
X
X
‐ ‐ ‐
‐ ‐ ‐
‐ ‐ ‐
X
42
53
107
92
116
235
(1)
87
1419
220
127
5
25.4
1
39142
8800
(3)
76
(3)
3
3.8
55
4.5
65
‐ ‐ ‐
X
116
255
Hide quick links:
Advertisement
Table of Contents
