Changing Actuator Mounting Position
On 4–20" (100–500mm) valves, the actuator can be mounted in 60° increments around the valve shaft.
90° or 270° position changes require changing the gear sector on Size 6 & Size 12 actuators or the
timing between the gear sector and the rack on Size 16 actuators; 60° position changes do not require
changing the gear sector or timing.
On 24–36" (600–900mm) valves, handwheel/chainwheel sizes will limit actuator mounting positions.
However, the actuator can be mounted in 45° increments around the valve shaft. 45° position changes
require changing the timing between the gear sector and the rack; 90° position changes do not require
changing the timing.
Mounting Actuator in 60° Increments on 4–20" (100–500mm) Valves and
90° Increments on 24–36" (600–900mm) Valves
1. Remove the actuator from the valve. See "Removing Actuator" section.
This valve is a pressure vessel. On 4, 5, 6 and 10" (100, 125, 150 and 250mm) valves, the same
bolts hold both the actuator and the bonnet.
Removing the bolts on 4, 5, 6 and 10" (100, 125, 150 and 250mm) valves before relieving
pipeline pressure can result in personal injury or equipment damage.
Always relieve pipeline pressure before removing the actuator.
2. Rotate the actuator into position.
3. Install the actuator on the valve. See "Installing Actuator".
Changing Actuator to 90°/270° Positions on 4–20" (100–500mm) Valves with
Size 6 & Size 12 Actuators Only (Requires a different gear sector)
When eccentric valves are mounted in a vertical pipeline, or mounted in a horizontal pipeline with the
plug stem horizontal, gravity can cause the plug to swing to a lower position in the valve body when
the gear sector is removed. To avoid this problem, place the plug in the lowest position before
removing the gear sector.
1.
Discontinue flow and relieve pipeline pressure.
2. If possible, put the valve in the closed position just so the plug is touching the valve seat.
3. Remove the lock nut, spring washers, wrenching nut and pointer from the plug stud.
4. Scribe corresponding lines on the actuator cover and housing, then remove the cover screws
and cover from the top of the actuator.
5. Note that one edge of the gear is either against or close to the stop screw in the side of the
gear housing, this is where the other gear should be after the actuator has been rotated
and the new gear installed. Now lift the gear sector out of the actuator.
6.
Remove the 4 screws fastening the gear housing to the adaptor.
7. Pry the gear housing loose from the valve adaptor and turn it 90°clockwise or
counterclockwise to suit your need. Line up the bolt holes and install and tighten the 4
screws.
August 2012
Manual G-Series Actuators on PEC Eccentric Valves
Page 13
DeZURIK
90°
D10063
Imprimir página