AirSep AS-Q, Instruction Manual

Page: 132 / 198

132 AS-Q—AS-Z Series Instruction Manual
AirSep Corporation
Refer to the Section 4, MAINTENANCE for stem seal
adjustment. If there is weepage past the stem seals upon
installation, it means the valve may have been subject
to wide temperature variations in shipment. Leak-tight
performance will be restored by a simple stem seal
adjustment described in the MAINTENACE section.
3.3 Valve Insulation
If necessary, the valve may be insulated. Insulation must not
continue above the upper level of the valve (see Figure 7).
3.4 Actuator
WARNING:
WHEN INSTALLING THE ACTUATOR ON THE VALVE, MAKE SURE
THAT THE VALVE ASSEMBLY FUNCTIONS PROPERLY. INFORMATION
ON ACTUATOR INSTALLATION IS GIVEN IN SECTION 6 OR IN THE
SEPARATE ACTUATOR INSTRUCTIONS.
The actuator should be installed in a manner that allows
plenty of room for its removal.
The upright position is recommended for the actuator.
The actuator must not touch the pipeline, because pipeline
vibration may interfere with its operation.
In certain cases it may be considered advantageous to
provide additional support to the actuator. These cases
will normally be associated with large actuators, extended
stems, or where severe vibration is present. Please contact
Metso for advice.
3.5 Commissioning
Ensure that there is no dirt or foreign objects left inside the
valve or pipeline. Flush the pipeline carefully. Make sure
that the valve is fully open when flushing.
Ensure that all nuts, fittings, and cables are properly
fastened.
If so equipped, check that the actuator positioner and/
or switch are correctly adjusted. Actuator adjustment
is explained in Section 6. To adjust any accompanying
device(s) refer to the separate control equipment
instruction manuals.
4. MAINTENANCE
4.1 General
Although Metso’s Jamesbury valves are designed to work
under severe conditions, proper preventative maintenance
can significantly help to prevent unplanned downtime and
in real terms reduce the total cost of ownership. Metso
recommends inspecting valves at least every five (5) years.
The inspection and maintenance frequency depends on
the actual application and process condition. Routine
maintenance consists of tightening the hex head cap
screws (15) in (Figure 15) periodically to compensate for
stem seal wear.
Overhaul maintenance consists of replacing seats and
seals. A standard repair kit consisting of these parts may be
obtained through your authorized Metso Distributor.
NOTE: Repair kits include thrust bearings (13), secondary
stem seal (7), seats (5), and body seal (6) and stem seals (8).
Refer to the Repair Kit chart (see Table 6).
WARNING:
FOR YOUR SAFETY IT IS IMPORTANT THE FOLLOWING
PRECAUTIONS BE TAKEN PRIOR TO REMOVAL OF THE VALVE FROM
THE PIPELINE OR BEFORE ANY DISASSEMBLY:
1.
WEAR ANY PROTECTIVE CLOTHING OR EQUIPMENT
NORMALLY REQUIRED WHEN WORKING WITH THE FLUID
INVOLVED.
2. DEPRESSURIZE THE PIPELINE AND CYCLE THE VALVE AS
FOLLOWS:
A.
PLACE THE VALVE IN THE OPEN POSITION AND DRAIN
THE PIPELINE.
B. CYCLE THE VALVE TO RELIEVE RESIDUAL PRESSURE
IN THE BODY CAVITY BEFORE REMOVAL FROM THE
PIPELINE.
C. AFTER REMOVAL AND BEFORE ANY DISASSEMBLY,
CYCLE THE VALVE AGAIN SEVERAL TIMES.
Avoid this mounting position
Figure 6
Insulation Limit
Figure 7
IMO 1/18
6 IMO-308 EN