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Instruction Manual
Form 5062
May 2008
be equipped with a manual handwheel
actuator. Refer to the separate manual
handwheel actuator instruction manual
for mounting instructions.
Top-Mounted Handwheel Assembly is attached to
a special upper diaphragm casing (key 1, figures 8
and 9) with cap screws (key 141, figure 10). A hex
nut (key 137, figure 11) locks the handwheel in
position. Turning the handwheel (key 51, figure 10)
clockwise into the upper diaphragm casing forces
the pusher (key 135, figure 10) against the
diaphragm and diaphragm plate (keys 3 and 4,
figures 8 and 9) to compress the spring (key 11,
figures 8 and 9) and move the diaphragm rod
downward.
Turning the handwheel counterclockwise allows the
actuator spring to move the diaphragm rod upward.
D If the valve is push-down-to-close, full opening
can be restricted by positioning the handwheel at the
desired position.
D If the valve is push-down-to-open, full closing of
the valve can be restricted by use of the handwheel.
Adjustable Up Travel Stop (figure 11) limits the
actuator stroke in the upward direction. To make
adjustments, first relieve actuator loading pressure
before removing the closing cap (key 187) as it is a
pressure retaining part. Remove the closing cap
(key 187). Also, for size 70 actuators, the hex nut
(key 137) must be loosened. Then turn the stem
(key 133) clockwise into the diaphragm case to
move the actuator stem downward or
counterclockwise to allow the spring to move the
actuator stem upward.
D If the valve has push-down-to-close action, full
opening can be restricted by the position of the
adjustable travel stop. Or,
D If the valve has push-down-to-open action, full
closing can be restricted by the position of the
adjustable travel stop.
For size 70, tighten the hex nut and replace the
closing cap after adjustment.
Adjustable Down Travel Stop (figure 12) limits the
actuator stroke in the downward direction. To make
adjustments, first relieve actuator loading pressure
before removing the closing cap (key 187) as it is a
pressure retaining part. Remove the closing cap
(key 187). Loosen the hex jam nut (key 189) and
either turn the hex nut (key 63 for size 40 and 70
actuators; or key 54 for size 60 actuators) down on
the stem (key 133) to limit travel, or up on the stem
1051 & 1052 F & G Actuators
to allow more travel. Lock the jam nut against the
hex nut, and replace the closing cap after the
adjustment has been made.
Handwheel Maintenance and
Adjustable Travel Stop
If loading pressure seems to be leaking from either
the handwheel or adjustable up stop, the O-rings
(key 138 and 139, figures 10 and 11) may need
replacement. If the adjustable down stop leaks, the
O-ring (key 139, figure 12) may need replacement or
possibly the closing cap (key 187, figure 11) is not
tight. To tighten the closing cap, apply a good grade
of thread sealant to the closing cap threads.
For ease of operation, the stem threads (key 133,
figures 10, 11, and 12) may need an occasional
application of lithium grease (key 241). A grease
fitting (key 169, figures 10 and 11) is provided for
this purpose in the size 70. The size 70 may also
need to have the thrust bearing (key 175, figures 10
and 11) packed with lithium grease
(key 241). Travel stops for the smaller casings can
be lubricated between the stem and pusher (key
135, figures 10 and 11) with lithium grease
(key 241).
The following disassembly procedures are separated
where appropriate between the top-mounted
handwheel and adjustable up travel stop assemblies
(figures 10 and 11) and the adjustable down travel
stop assembly (figure 12).
To avoid personal injury, perform the
steps in the WARNING at the
beginning of the Maintenance section
to isolate the control valve and
actuator.
1. Remove the tubing or pipe from the handwheel
body (key 142, figures 10, 11, and 12).
To avoid personal injury from the
pre-compressed spring force thrusting
the upper diaphragm casing (key 1,
figures 8 and 9) away from the
actuator, either relieve Type 1052
spring compression, or carefully
remove Type 1051 casing cap screws
by following the instructions that are
referenced in the steps below before
removing the casing.
WARNING
WARNING
15
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