Jordan Valve 1051M Series Rotary Actuator - Manual (Page 5)

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Principle of Operation
As the loading pressure is increased on top of the dia-
phragm the diaphragm rod moves down. As the load-
ing pressure is decreased, the diaphragm rod is forced
upward by the spring.
The spring and diaphragm have been selected to fulfill
the requirements of the application. When in service
the actuator should produce full travel of the valve with
the diaphragm pressure as indicated on the nameplate
(Figure 1)
For principle of operation of the actuator with a valve
positioner, refer to the separate positioner manual.
M
aIntenance
Actuator parts are subject to wear and tear which
requires inspection and replacement as necessary
according to the severity of service conditions. The
following instructions outline adjustment, disassembly
and reassembly of parts. Refer to Figures 6 & 7 for Key
Numbers.
Warning: The sudden release of process fluid can
cause personal injury or property damage. Prior to start-
ing adjustment procedures:
• Isolate the valve from the process,
• Release the process pressure, and
• Vent the actuator loading pressure.
Disassembly
The 1051M Actuator can be completely disassembled
by following these procedures. When inspecting or
repairing the actuator, perform only those steps neces-
sary. Under normal conditions, the cap screws (Keys 2,
42 and 43) should not be removed.
Note: Cap screw (Key 12) must be disengaged from the
lever (Key 33) prior to removing the diaphragm casing
(Key 26). Failure to do so will allow the spring compres-
sion to rotate the valve beyond its fully open or closed
position. This could cause damage to the valve seal.
1. Bypass the control valve, relieve all loading
pressure and remove the tubing or piping from
the top of the actuator.
2. If the control valve assembly includes a valve
positioner, remove it from the assembly.
3. Remove the cap screws and washers (Keys 8
and 9) as well as the cover (Key 41).
4. Remove the retaining ring and then the hub
(Keys 36 and 30) from the cover.
5. Inspect the bushing (Key 40). If replacement is
necessary, remove the travel indicator for
scale (Key 39) by first unscrewing
the self-tapping screws (Key 37).
6. Remove the cap screw and hex nut (Keys 12
and 31).
7. Note the orientation of the lever/valve shaft, and
then loosen the cap screw (Key 10).
Note: Avoid using a hammer to drive the lever (Key
33) off of the valve shaft. On some valve types this
could cause the valve ball and bearings to move from
their centered position, causing damage to valve
parts during operation.
If using a tool is necessary, use a wheel puller to
remove the lever. Tapping the wheel puller screw
lightly to loosen the lever is permissible, but hitting
the screw with excessive force could also cause
damage to valve parts or disrupt the positioning of
the valve ball and bearings.
Warning: Before proceeding further, remove the cap
screws and relieve the spring compression. Fail-
ure to do so may cause personal injury if the com-
pressed spring force suddenly thrusts the upper
diaphragm casing away from the actuator.
8. Loosen but do not remove the casing cap
screws (Key 45). Ensure that all spring force in
the upper diaphragm casing has been relieved.
Unscrew and remove the cap screws and hex
nuts (Keys 45 and 44) then remove
the upper diaphragm casing and the diaphragm
(Key 25).
9. Refer to the warning on the Jordan Valve name
plate (Key 27) located on the diaphragm
plate (Key 1).
10. Remove the diaphragm plate (Key 1) and the
attached parts from the actuator. The following
parts will be attached to the diaphragm
head: spring (Key 21), diaphragm rod (Key 22),
cap screw (Key 24), spring seat (Key 19),
hex nut (Key18), turnbuckle (Key 16),
hex nut (Key 14) and rod end bearing (Key 13).
1051M S
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