OpDx Butterfly Control Valve
4
7. Check positioner calibration by observing
the gauges and the disc position indicator
plate. Make sure the positioner is calibrated
to the correct range.
8. Remove transfer case cover plate and
make sure the positioner linkage and
internal actuator parts are securely
fastened. Also, check for air leaks through
actuator stem seal, using a soap solution.
CAUTION:
Never apply air to the
actuator without the cover
plate installed; otherwise, the
unsupported shaft may sustain
damage.
9. Be sure that all accessories, brackets and
bolting are securely fastened.
10. If possible, remove air supply and observe
stroke plate for correct fail-safe action.
11. Spray soap solution around the cylinder
retaining ring and the adjusting screw to
check for air leaks through the O-rings.
12. Clean any dirt or other foreign material
from the exposed portion of the shaft.
13. If an air filter is supplied, check and replace
cartridge if necessary.
ASSEMBLY AND DISASSEMBLY
Valve Removal from Line
If an internal valve problem is suspected with
the valve and disassembly is required, remove
the valve from the line by proceeding as
follows:
WARNING:
Depressurize line to
atmospheric pressure, drain
all process fluids and decontaminate
the valve (if caustic or hazardous
materials are present).
1. Make sure valve is fully closed.
Note:
On valves with fail-open action, air
pressure must be supplied under the
actuator piston to close the valve. If the valve
is supplied with a handwheel, it can be used
to close the valve.
2. Attach a hoist or some means to support
the valve.
3. Remove the line bolting. Do not attempt to
pry line flanges apart by pushing or pulling
on valve actuator.
4. Slide the valve carefully from the line. To
avoid damage to gasket surfaces, do not
twist the valve.
5. After the valve is completely removed from
the line, slowly relieve air pressure from the
actuator.
Actuator Removal
In most cases, both the body assembly and the
actuator are easier to disassemble with the
actuator removed from the body. To do so,
proceed as follows:
1. Support actuator assembly by the lifting
ring before disconnecting it from the body
assembly.
2. Remove the transfer case cover bolts.
Carefully pry or slide the cover plate from
the end of the shaft.
3. On Optimux actuators with a clamping lever
arm design, loosen the linkage bolt.
4. Loosen the actuator adjusting screw to
release spring pressure.
5. Remove the bolts connecting yoke to the
actuator subassembly.
6. Slide entire actuator assembly off the shaft.
For Optimux actuators with a clamping
lever-arm design, it may be necessary to
wedge the halves of splined lever arm apart
to loosen it from the shaft splines.
