Watson McDaniel 455 SERIES, Installation & Operating Instructions

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OPERATING CONDITIONS:
MAX. INLET PRESSURE 250 PSIG
MIN. INLET PRESSURE 5 PSIG
MAX. DIFF. PRESSURE 125 PSIG
MIN. DIFF. PRESSURE 20% of inlet pressure
1/2" - 1 1/2" SERIES 455 INSTRUCTIONS: S
TEM
P
ACKING
R
EPLACEMENT
1.) Isolate Series 455 from all system pressure. It will be necessary to remove the
bracket because the packing is endless. Back off the bracket locknut and unscrew
stem from end of diaphragm stem.
2.)
Remove the actuator-bracket assembly from the valve.
3.)
Reach down along the Stem with a picking device to pull out all the old Packing
Rings. Be careful not to scratch or gouge any of the sealing surfaces.
4.)
Push the new Packing Rings into place.
5.)
Slide Spring into place and hand tighten the Packing Nut.
6.)
Reinstall the bracket-actuator assembly to the stem and valve.
7.)
Bring the regulator back on line.
2227900 REV 3 PAGE 37a