Type 1052 Spring Adjustment; Initial Compression - Emerson 1051 Instruction Manual

1051 & 1052 H & J
Table 9. Wrench Sizes Required for Turnbuckle
Adjustment, Inches
ACTUATOR
BUCKLE BUCKLE
Type Size
(KEY 57)
1051 & 40
1052 60
1052 70
3. Make sure the actuator housing (key 20) is clear
of any tools or other instruments that could obstruct
the actuator stroke path. Pressure the diaphragm
casing enough to stroke the actuator down so that
the left-hand threaded upper locknut (key 58) is
accessible through the access opening. Loosen the
locknut.
4. Use one of the following:
a. For push-down-to-close action—Slowly
stroke the actuator to the down travel stop.
Consult the appropriate instruction manual for
determining the closed position of the valve body
or other operated equipment. Adjust the
turnbuckle (key 57) until the closed position is
reached. Lock this adjustment with the left-hand
threaded locknut (key 58). Stroke the actuator to
the mid-travel position, and tighten the locknut
(key 16). Tighten each locknut to the appropriate
torque value listed in table 10.
WARNING
Exceeding any torque requirements
could damage the actuator and impair
safe operation.
b. For push-down-to-open action—Consult the
appropriate instruction manual for determining
the closed position of the valve or other operated
equipment. Release all pressure from the
diaphragm casing, making sure the diaphragm is
against its up travel stop. Be sure that the
optional handwheel is adjusted to its topmost
position so that the closed position of the actuator
and valve body or other operated equipment can
be reached simultaneously. Check the position of
the valve body or other operated equipment with
respect to its properly closed position. Stroke the
actuator so the turnbuckle (key 57) is accessible
through the access opening. Adjust the linkage.
Release pressure to the actuator, and check the
new adjustment. Continue this procedure until the
operated equipment is in the closed position
12
TURN- LOWER UPPER
LOCKNUT LOCKNUT LOCKNUT LOCKNUT
(KEY 16) (KEY 58)
1-1/8 3/4 1-1/8
1-5/16 15/16 1-5/16
1-5/16 1-1/8 1-5/16
when the actuator is resting on its up travel stop.
Tighten locknut (key 16). Stroke the actuator, and
tighten the left-hand threaded locknut (key 58).
Tighten each locknut to the appropriate torque
value listed in table 10.
WARNING
Exceeding any torque requirements
could damage the actuator and impair
safe operation.
5. Replace the access plate (key 59). Also, replace
the machine screws (key 60), if present.
6. Loosen the self-tapping screws (key 38), and
adjust the travel indicator (key 37). Retighten the
self-tapping screws.

Type 1052 Spring Adjustment

Initial Compression

The Type 1052 nameplate specifies a spring set,
which is the initial compression adjusted into the
actuator spring, Initial compression is the casing
pressure at which the diaphragm and diaphragm rod
begin to move away from the up travel stop with the
actuator disconnected from the valve body or other
operated equipment. (With the actuator connected
and pressure applied to the valve body or other
operated equipment, a higher casing pressure will
be required to start actuator travel). The initial
compression was selected (based upon the service
conditions specified when the actuator was ordered)
so that when the actuator and valve body or other
operated equipment are in service, the operated
equipment will close properly and full travel will be
obtained within a diaphragm casing pressure range
of 0 to 1.2, 0 to 2.3, 0 to 2.8 or 0 to 3.8 bar (0 to 18,
0 to 33, 0 to 40, or 0 to 55 psig) depending on
specific actuator size and construction.
If the actuator has been disassembled or if the
spring adjustment was changed, and it is desired to
match the initial compression stated on the
nameplate, make sure the rod end bearing (key 17,
figure 13) has been disconnected from the lever
(key 27, figure 13). Adjust the spring so that the
diaphragm rod just starts to travel at the spring set
pressure specified on the nameplate. Be sure the
rod end bearing does not hit the lever as the
diaphragm and diaphragm rod move away from the
up travel stop.
Instruction Manual
Form 5587
November 2006