©COMEV
AL
V
AL
VE SYSTEMS
Technical Dept. Ref. IOM - PNEUMA
TIC
ACTUA
TORS
AF SERIES - Ed.20/1
1
Comeval V
alve Systems reserves the right to alter any technical data contained in this Manual without prior notice. Regularly updated data on www
.comeval.es
COLUMNLESS PNEUMATIC ACTUATORS AF SERIES
FOR DIAPHRAGM VALVES
Page 6
Normally closed actuator assembly after maintenanace (see parts list in Chapter
13)
Before beginning the assembly check the diaphragms (both valve and actuator) and check that all the components are
greased correctly using a standard commercial grease.
1.
Assembly the bonnet to the body tighttenning the bolts in a cross pattern way.
2.
Place the bottom support plate (be sure the position of the plate allow to place the diaphragm firmly).
3.
Place the diaphragm and hold it firmly into the bottom support plate housing. Match the diaphragm holes with the lower
chamber holes.
4.
Place the diaphragm upper plate (be sure the retaining washers’ housing is looking upwards).
5.
Match the opening indicator position to the previously marked in lower chamber.
6.
Attach the stem extension to the valve’s stem firmly and place the retaining washers to the upper plate.
7.
Place the spring, the spring plate and the upper chamber.
8.
Tight the between chamber’s bolts and nuts.
9.
Place the upper part of the actuator and turn the handwheel anti-clockwise until the sping chamber’s long bolts could
be tighten.
10.
Tight the spring chamber’s bolts gradually and set the limit opening bolts to their initial positions.
11.
Release the spring to its rest position by turn the handwheel clockwise.
12. Place and tight the nut on the stem extension and the cotter pin on the stem extension and lock it.
13.
Tight the allen screw below the handwheel.
Normally open actuator dismantling for maintenance (see parts list in Chapter
13)
1. Safely disconnect all electric power and supply lines connected to the actuator or accessories.
2.
Disassemble all the accessories of the actuator (solenoid, limit switch box, etc).
3. Turn the handwheel anti clockwise in order to release the spring tension.
4.
Remove the spring chamber’s bolts of the upper part of the actuator.
5.
Remove the bolts of the spring chamber.
6.
Mark the position of the visual indicator on both chambers and then remove the visual indicator and the stem extension’s
locking nut carefully .
7.
Remove the spring upper plate, the spring and the spring’s seat.
8.
Remove the between chambers’ bolts.
9.
Remove the upper chamber.
10. Remove the retaining washers and the stem extension.
11.
Remove the diaphragm upper plate, the diaphragm and the bottom suport plate.
12.
Remove the bonnet.
13. Clean the components of the actuator perfectly.
14. Inspect the components of the actuator for wear or damage and replace what is necessary.
Normally open actuator assembly after maintenanace (see parts list in Chapter
Before beginning the assembly check the diaphragms (both valve and actuator) and check that all the components are
greased correctly using a standard commercial grease.
1.
Assembly the bonnet to the body tighttenning the bolts in a cross pattern way.
2.
Place the bottom support plate (be sure the position of the plate allow to place the diaphragm firmly).
3.
Place the diaphragm and hold it firmly into the bottom support plate housing. Match the diaphragm holes with the lower
chamber holes.
4.
Place the diaphragm upper plate (be sure the retaining washers’ housing is looking upwards).
5.
Attach the stem extension to the valve’s stem firmly and place the retaining washers to the upper plate.
6.
Place the upper chamber and match the indicator position with the lower chamber.
7.
Place the seat’s spring, the spring and the spring’s upper plate.
8.
Screw the stem extension’s retainer and the visual indicator, match the visual indicator with the marks on the upper and
lower chamber.
9.
Place the spring chamber and the upper part of the actuator.
Double acting actuator dismantling for maintenance (see parts list in Chapter
1. Safely disconnect all electric power and supply lines connected to the actuator or accessories.
2.
Disassemble all the accessories of the actuator (solenoid, limit switch box, etc).
3.
Remove the upper chamber.
4.
Remove the stem’s locking nut, the upper plate, the diaphragm and the lower plate.
5.
Remove the bonnet.
Double acting actuator assembly after maintenanace (see parts list in Chapter
13)
Before beginning the assembly check the diaphragms (both valve and actuator) and check that all the components are
greased correctly using a standard commercial grease.
1.
Assembly the bonnet to the body tighttenning the bolts in a cross pattern way.
2.
Place the bottom support plate (be sure the position of the plate allow to place the diaphragm firmly).
3.
Place the diaphragm and hold it firmly into the bottom support plate housing. Match the diaphragm holes with the lower
chamber holes.
4.
Place the diaphragm upper plate (be sure the position of the plate allow to place the diaphragm firmly).
5. Attach the locking nut to the stem.
6.
Place the upper chamber.
