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REPAIR PROCEDURES
Leakage, broken parts, hard operation, and other major defects should be corrected by a repair crew as soon as
possible after the defect has been reported. If repairs are to be performed in the field, the repair crews should take a full
complement of spare parts to the jobsite. Provisions should be made to isolate the defective valve from water pressure
and relieve internal trapped pressure prior to performing any corrective maintenance. Disassembly of the valve should be
accomplished in accordance with the procedure supplied in the following sections. After repairing the valve, the operating
mechanism should be cycled through one complete operating cycle. With full line pressure applied to the valve in the open
position, an inspection should be made to detect leakage in the areas around the seat, bonnet, packing/stem, and body-end
connections. A record should be made to indicate that the valve has been repaired and is in working condition. Any marking
that the valve is inoperable should be removed. In addition, fire department and other appropriate municipal departments
should be informed of satisfactory repair of the valve.
PACKING ADJUSTMENT
1. This can be carried out with the valve under pressure in the pipeline.
2. Tighten the two gland nuts (4) on gland (8) to stop the leakage
3. If the leakage continues, the packing should be replaced.
PACKING REPLACEMENT
Need a packing replacement without removing the actuator and top plate. Valmatic does it by cutting the packing.
1.
Isolate the valve and depressurize the line.
2.
Remove hot melt (1) to expose ISO flange bolts (2)
3.
Remove actuator.
4.
Remove ISO flange(3) with bolts (2)
5.
Remove gland (8) & gland nuts(4) & washers(6) and replace packing (9)
6.
Put gland (8) and tighten the gland nuts (4) to press packing (9) until no leakage
7.
Put ISO flange (3) and tighten the ISO flange bolts (2) ( 4xthread size=req. Nm, See table )
8.
Install actuator.
Valve Size
Torque Ft. Lbs.
2 1/2" - 3"
30
4" - 6"
35
8"
50
10" -12"
60
