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657 Size 80 and 100 Actuators
Instruction Manual
Form 1909
August 2006
2
Table 1. Specifications
SPECIFICATIONS
ACTUATOR SIZE
80 100
Nominal Effective Diaphragm Area
cm
2
1761 2902
inch
2
273 450
Yoke Boss Diameters
mm 127 127 178
inch 5 5H
(1)
7
Acceptable Valve Stem Diameters
mm 25.4 or 31.8 31.8 50.8
inch 1 or 1-1/4 1-1/4 2
Maximum Allowable Output Thrust
N 62,942 200,170
lb 14,150
(2)
45,000
Maximum Travel
mm 76 102
inch 3 4
Maximum Casing Pressure for Actuator
Sizing
(3)
Cast Iron Steel
bar 3.4 4.9 6.9
psig 50 70 100
Maximum Diaphragm Casing Pressure
(3)(4)
Cast Iron Steel
bar 4.1 5.5 7.9
psig 60 80 115
Material Temperature Capabilities
_C
−40 to 82
_F
−40 to 180
Pressure Connections 1/4 inch NPT female
Approximate Weights Without Handwheel
kg 234 346
lb 515 762
1. Heavy actuator-to-bonnet bolting.
2. 88,075 N (19,800 lb) for steel construction.
3. Maximum diaphragm casing pressure must not be exceeded and must not produce a force on the actuator stem greater than the maximum allowable actuator output thrust or the
maximum allowable valve stem force. (If you have any questions on allowable valve stem force, contact your Emerson Process Management sales office.)
4. 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.
Introduction
Scope of Manual
This instruction manual provides information on
installation, adjustment, maintenance, and parts
ordering for the Type 657 actuator in sizes 80 and
100. Refer to separate instruction manuals for
information about other equipment and accessories
used with these actuators.
No person may install, operate, or maintain Type
657 actuators without first D being fully trained and
qualified in valve, actuator, and accessory
installation, operation, and maintenance, and D
carefully reading and understanding the contents of
this manual. If you have any questions about these
instructions, contact your Emerson Process
Management sales office before proceeding.
Description
The Type 657 actuator (figure 1) is a direct-acting,
spring-opposed diaphragm actuator used for
automatic operation of control valves. The actuator
positions the valve plug in response to varying
pneumatic loading pressure on the diaphragm.
Figure 2 shows the operation of these actuators.
A Type 657 actuator can be furnished with either a
top-mounted or side-mounted (size 80 only)
handwheel assembly. A top-mounted handwheel
assembly is normally used as an adjustable-up
travel stop. The size 100 top-mounted handwheel
may be used as an auxiliary manual actuator. A
side-mounted handwheel assembly is normally used
as an auxiliary manual actuator.
Specifications
Refer to table 1 for specifications of the Type 657
actuator. See the actuator nameplate for information
about a specific actuator.