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657 Actuator (30-70 and 87)
Instruction Manual
Form 1900
February 2007
3
Figure 2. Schematic of Type 657 and 657-4 Actuators
SPRING LIFTS
STEM UP
AIR PUSHES
STEM DOWN
STEM
AF3833-A
A0792-2/IL
Installation
Key number locations are shown in figures 6, 7,
and 8, unless otherwise indicated. Also, refer to
figure 3 for location of parts.
WARNING
Always wear protective gloves,
clothing, and eyewear when
performing any installation operations
to avoid personal injury.
Check with your process or safety
engineer for any additional measures
that must be taken to protect against
process media.
If installing into an existing
application, also refer to the WARNING
at the beginning of the Maintenance
section in this instruction manual.
CAUTION
To avoid parts damage, do not use an
operating pressure that exceeds the
Maximum Diaphragm Casing Pressure
(table 1) or produces a force on the
actuator stem greater than the
Maximum Allowable Output Thrust
(table 1) or the maximum allowable
valve stem load. (Contact your
Emerson Process Management sales
office with questions concerning
maximum allowable valve stem load.)
Figure 3. Actuator Mounting Components for Size 30
through 70 Actuators
VALVE STEM
YOKE LOCK NUT
YOKE BOSS
DIAMETER
BONNET
TYPICAL VALVE
(REFER TO
VALVE MANUAL)
W6199–1/IL
MATCH
LINE
FOR
ACTUATOR
NPT FEMALE
CONNECTION
DIAPHRAGM CASING
DIAPHRAGM AND
STEM SHOWN IN
UP POSITION
DIAPHRAGM
PLATE
ACTUATOR SPRING
ACTUATOR STEM
SPRING SEAT
SPRING ADJUSTOR
STEM CONNECTOR
YOKE
TRAVEL INDICATOR DISK
INDICATOR SCALE
W0363–1/IL
LOWER DIAPHRAGM CASING
D Valve/Actuator Assembly: If the actuator and
valve are shipped together as a control valve
assembly, it has been adjusted at the factory, and
may be installed in the pipeline. After installing the
valve in the pipeline, refer to the Loading Connection
procedures.
D Actuator Mounting: If the actuator is shipped
separately or the actuator has been removed from
the valve, it is necessary to mount the actuator on
the valve before placing the valve in the pipeline.
Refer to the actuator mounting procedures before
placing the valve in service. You may perform the
Bench Set Spring Adjustment procedures in this