Removing Cylinder
This procedure can be performed with the actuator installed on the valve or removed.
1. Discontinue flow and relieve pipeline pressure.
2. Apply air pressure to the port in the cylinder cap (the end farthest from the actuator housing)
until the valve has moved to the end of its stroke.
Accidental operation of power actuator can cause personal injury or equipment damage.
Disconnect and lock out power to actuator before servicing.
3. Disconnect and lock out the pneumatic power to prevent accidental operation of the actuator.
4. Disconnect the tubing from both cylinder ports.
5. Remove the extension cap from the actuator housing. On units with booster cylinders, carefully
remove the booster cylinder or cylinders.
6. Remove the nuts and spring washers from the end of the rack rod.
7. Remove the screws or nuts fastening the cylinder assembly to the housing, and carefully
remove the cylinder assembly by sliding it away from the actuator until the rack rod clears the
actuator housing.
8. See cylinder instructions for details on rebuilding the cylinder.
Installing Cylinder
1. Scrape the old gasket material from the actuator housing and cylinder head, then place a new
gasket on the cylinder head.
2. Install the cylinder/rack rod assembly by sliding the rack rod through the rack then fasten the
cylinder to the housing.
Note: If the rack rod is not attached to the cylinder, clean the threads of both the rack rod and
the cylinder shaft, then apply Loctite to the cylinder shaft threads, and screw the rack rod onto
the cylinder shaft.
3. Slide the spacer, spring washers and nuts onto the rack rod. See Table E for arrangement of
spring washers.
4. Screw one nut onto the rack rod. Screw the nut down until the spring washers are completely
compressed, then back the nut off until the washers return to their normal shape.
5. Screw the other nut onto the rack rod and tighten the two nuts against each other.
6. Replace the extension cap. On units with booster cylinders, replace the booster cylinder or
cylinders.
7. Reconnect power to the actuator.
8. Adjust the position stops as described in the "Position Stop" section.
August 2012
Cylinder Operated G-Series Actuator
Page 11
DeZURIK
D10022
Pagina afdrukken