Flowserve McCANNA CryoSeal Ball Valves - Manual (Page 6)

McCANNA CryoSeal ® Ball Valves FCD MMENIM2007-01-AQ – 04/15
6
3
Periodic Inspection and Adjustment
3.1 General
3.1.1 Good operating and maintenance procedures include periodic inspection of valves and other
piping system components to ensure that they are operating properly. Inspection schedules
must be determined by individual user, but as a minimum should consist of visually examining
valves for external leakage, and making adjustments as necessary.
a WARNING: Do not attempt any maintenance of these valves while in operation or under
pressure. Actuated valve air and/or electrical power supplies must be locked off and isolated
prior to any maintenance work. Failure to do so may result in significant equipment damage,
hazardous material discharge, or serious personal injury.
3.2 Stem Seal Adjustment
3.2.1 Stem seal leakage must be stopped immediately to avoid damage to the valve stem seals, stem
or bonnet, as well as possible contamination of the surrounding area. Tightening the adjuster
bolts (see Figure 3) can most often eliminate stem seal leakage. Tighten adjuster bolts by
turning each clockwise 1/4 turn at a time until the torque value (given in Table 2) is reached.
3.2.2 If stem leakage continues, disassemble valve and replace stem seal set (see Disassembly/
Reassembly sections).
a CAUTION: Do not overtighten the adjuster bolts. Packing friction may increase excessively,
making the valve difficult or impossible to operate.