(2) Removing the trim
After removing the valve plug, remove the seat ring with the special wrench for the seat
ring.
(3) Taking out the gland parts
Take out the gland parts with a pipe, etc. Take notes of the type, quantity, order, etc., of
parts such as the packing and spacers in order to facilitate reassembly.
CAUTION
Use the special seat ring wrench to remove the trim (internal valve).
Otherwise, the trim may be damaged.
5-5. Reassembling the Valve Body
Precautions for assembly
• Check that there is no problem with the parts, referring to "5-4. Disassembling the
Valve Body". If a problem is found, repair or replace the part as needed.
• Always use new gland packing and gaskets.
• Note that the quantity, stacking order and direction of packing differs depending on the type
of packing and fluid conditions.
• Check that foreign matter produced by maintenance do not remain inside the valve.
• For washing-restricted models (e.g., degreased or waterproof models), additional
materials and sealing material with special specifications are required. Please refer to the
specifications.
Assembly procedure
Check the nominal diameter of the pipe connection of the control valve, and reassemble the
valve referring to
Figure 5-2 to Figure 5-4 “Valve body structure.”
(1) Mounting the seat ring
Step Procedure
1 Screw the seat ring into the valve with your hand. For a model with standard specifica-
tions, apply an agent to prevent galling*
1
to the screws and between the valve and seat
ring.
For a degreased model, use a seat ring gasket. Apply lubricant*
2
to the above-men-
tioned locations, position the seat ring gasket, and screw the seat ring into the valve.
2 Place the special seat ring wrench on the valve, and tighten the seat ring to the torque
specified in
Table 5-1.
CAUTION
Before attaching the trim (internal valve), check whether a ded-
icated tool that is appropriate for the specification is necessary.
If it is needed, be sure to use it.
*1. Use Never-Seez made by the U.S. company Bostik or the equivalent.
*2. Use GPL 207 made by Krytox or the equivalent.
5-8
To Next Page
Loading...
Need help?
General
