Valmet Flowrox SKW DN50-600, Инструкция по установке, обслуживанию и эксплуатации

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4SK70EN - 5/2023
18
6.6 Valve dismantling
Follow these instructions if you are to do full overhaul on the
valve. Part numbers refer to Mechanical structure.
Removing the actuator, gate, and tower
1. Remove the valve from the pipeline as instructed in the
earlier chapter 6.5.
2. Install locking pins (13) between the gate (2) and tower
(3).
3. Remove the tower mounting bolts (5) bolts and lift the
actuator, gate (2) and tower (3) off.
4. To detach the gate (2) from the actuator stem, remove
retaining ring (17) and the clevis pin (16) from the clevis
(14).
Figure 13. Removing the clevis pin.
5. Clean the gate (2) and inspect it for deep scars and
transformations. Replace the gate if it’s damaged to
prevent accumulation of damage to the secondary seal
(7) and ring sleeves (4).
6. Use a marker to mark the height of the clevis (14) on the
cylinder shaft. The position is needed in valve assembly.
7. Remove the clevis locking screw (15) and the clevis (14).
8. Remove the bolts from between the actuator and tower
(or adapter plate if equipped). Lift the actuator off the
tower.
9. Refer to actuator manufactures’ instructions for actuator
sealing replacement or other maintenance work.
Dismantling the valve body
1. Disassemble the valve with the instruction above to the
point where the actuator, gate (2) and tower (3) have
been removed from the valve body (1).
2. Remove the ring sleeves (4) from the valve body and
inspect for visible damage such as cuts, slits or erosion
grooves. Depressions and evident flat spots are also
to be taken as signs of damage. Change ring sleeves if
damaged.
3. Remove the secondary seal (7).
4. Remove bottom cover plate (12).
5. Remove grease nipples (8).
Figure 14. Dismantled valve body.
6. Clean the body (1) from the inside and ensure that the
bores are flawless.
7. When all valve parts have been cleaned and inspected,
continue to Valve assembly .