Top-Mounted Handwheels And Adjustable Travel Stops; Handwheel And Travel Stop Operations - Emerson 1051 Instruction Manual

Instruction Manual
Form 5587
November 2006
Figure 11. Travel Stop Orientation
10. Follow the instructions in the Turnbuckle
Adjustment section.
Top-Mounted Handwheels and
Adjustable Travel Stops
Handwheel and Travel Stop Operation
If repeated or daily manual operation is
expected or desired, the unit should
be equipped with a manual handwheel
actuator. Refer to the separate manual
Note
1051 & 1052 H & J
handwheel actuator instruction manual
for mounting instructions.
The top-mounted handwheel assembly is attached
to a special upper diaphragm casing (key 1,
figures 12 and 13) with cap screws (key 141,
figure 15). A hex nut (key 137, figure 15) locks the
handwheel in position.
Turning the handwheel (key 51, figure 15) clockwise
into the upper diaphragm casing forces the pusher
(key 135, figure 15) against the diaphragm and
diaphragm plate (keys 3 and 4, figures 12 and 13) to
compress the spring (key 11, figures 12 and 13) and
move the diaphragm rod downward. Turning the
handwheel counterclockwise allows the actuator
spring to move the diaphragm rod upward. If the
action is push-down-to-close, full opening can be
restricted by positioning the handwheel at the
desired position. If the action is push-down-to-open,
full closing can be restricted by use of the
handwheel.
The adjustable up travel stop (figure 16) 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. Also, for size 70 actuators,
the hex nut (key 137) must be loosened.
Turning the stem (key 133) clockwise into the
diaphragm case moves the actuator stem downward
or counterclockwise to allow the spring to move the
actuator stem upward. If the action is
push-down-to-close, full opening can be restricted;
or if the action is push-down-to-open full closing can
be restricted by the position of the adjustable travel
stop.
The adjustable down travel stop (figure 17) 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. After removing the closing
cap 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 to allow
more travel. Lock the jam nut against the hex nut,
and replace the closing cap after the adjustment has
been made. For size 70, tighten the hex nut and
replace the closing cap after adjustment.
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