1-X-290 SERIES LONG STROKE MULTISPRING PNUEMATIC ACTUATORS
INSTRUCTION MANUAL - USE - MAINTENANCE
1. ACTUATOR INSTALLATION
1.1. The air signal supply of the actuator, or of the
positioner, which it may be supplied with, must
be connected with the controller outlet by pipes
of copper or other stainless materials.
1.2. Internal diameter of supply tube must be in
accordance with actuator air connection.
1.3. Bear in mind that, for valves without positioner,
the higher is the distance between valve and
positioner the higher must be the pipe diameter.
1.4. “SERTO” quick joints are recommended, which
allow to connect pipes without welding or
threading.
1.5. Deburr pipe ends and flush pipes by
compressed air before connecting actuator or
positioner air outlet with the controller.
1.6. Finally supply compressed air into the piping
and check any connection for leakage by suds.
2. REMOVING THE ACTUATOR FROM
THE VALVE (figure 1, 2 and 4)
WARNING DANGER
Loaded springs, risk of personal injury!
2.1. Referring to figure 5 proceed as follows to
remove the side-mounted manual operator, if
any from the actuator:
2.1.1. Discharge air and isolate the actuator from the
line.
2.1.2. Move the manual operator to closing position
to discharge the springs thrust on it.
2.1.3. Remove the radial ring (123).
2.1.4. Hold the manual operator and push connecting
pins (124) to the internal side of the yoke.
2.1.5. Extract pins (124) and remove the manual
operator.
2.2. DIRECT ACTING ACTUATOR (figure 1)
2.2.1. Supply compressed air to the actuator making
it to perform full stroke to relieve spring thrust.
2.2.2. Unscrew and remove screws (303).
2.2.3. Relieve air from the actuator to outdistance the
actuator stem from the valve one.
2.2.4. Disconnect pneumatic connection.
2.2.5. Unscrew screws (301) or ring nut (301), by
beating the ring nut notches with hammer and
punch.
2.2.6. Remove the actuator from the valve using
eyebolts (111).
2.3. REVERSE ACTING ACTUATOR (figure 2)
2.3.1. Supply compressed air to the actuator making
it to perform about half stroke to relieve spring
thrust.
2.3.2. Unscrew screws (303).
2.3.3. Relieve air from the actuator to move the valve
in closing position.
2.3.4. Remove screws (303)
2.3.5. Newly supply compressed air to the actuator to
outdistance the actuator stem from the valve
one and remove upper stem connector .
2.3.6. Relieve air from the actuator verifying that the
two stems are not in contact.
2.3.7. Disconnect pneumatic connection.
2.3.8. Unscrew screws (301) or ring nut (301), by
beating the ring nut notches with hammer and
punch.
2.3.9. Remove the actuator from the valve using
eyebolts (111).
3. DIAPHRAGM AND SPRINGS
REPLACEMENT
3.1. Remove eyebolts (111), nuts (110) and screws
(108).
3.2. Loose and remove nuts (107) and screws (106).
3.3. Remove threading protection (114) from loading
screws (112) and loose nuts (107) alternately to
progressively release springs thrust (125).
3.4. DIRECT ACTING ACTUATOR (figure 1)
3.4.1. Remove the diaphragm case (105).
3.4.2. Insert 4 screws (106) into diaphragm (118),
spacer (102) and lower case (104), locking
them with nuts (107) to avoid stem rotation.
3.4.3. Extract the split pin (201) and unscrew the nut
(121).
3.4.4. Extract the spacer (211).
3.4.5. Unscrew nuts (107) and screws (106).
3.4.6. Remove the diaphragm (118).
3.4.7. Extract the diaphragm plate (119) complete
with spacer disc (120 and O-ring (136).
3.4.8. Replace springs (125) respecting position
stated in figure 7.
3.4.9. House the diaphragm plate (119) complete
with spacer disc (120) and O-ring (136).
3.4.10. Place a new diaphragm (118).
3.4.11. Proceed as stated on par. 3.5.
3.4.12. Insert the spacer (211).
3.4.13. Screw the nut (121) onto actuator stem (128)
tightening it according to the torque stated in
table 2. Increase the torque if necessary to
match one sector present into the nut with one
foreseen on the actuator stem.
3.4.14. Lock the nut (121) by means of split pin (201).
3.4.15. Remove nuts (107) and screws (106).
