Replacing The Valve Plate; Replacing Diaphragm Valves; Preparation - ABB PGC5000 Series Service Instructions Manual

PGC5000
PGC5000 Series Service Instructions
26. Close the front Carrier Assembly latch.
27. Install the Valve Body over the screws on the Mounting Plate and rotate the Valve Body clockwise to seat it. The port
connections must face the same direction as when it was originally installed.
28. Tighten the four screws securing the Valve Body to the Mounting Plate.
29. Reinstall the air connection onto the Valve Body.
30. Reinstall the port connections, being careful to get each connection to the correct port.
31. Perform a leak check on the valve.
32. Turn on carrier gas, air and power.
33.
Check the operation of the valve.

7.7.5 Replacing the valve plate

VALVE PLATE
VALVE BODY
Fig. 7.16. Installing the Valve Plate on the Valve Body
1. Clean the inside counter-bored holes of the Valve Body to remove contamination and old sealant (see Figure 7.16).
2. Align the holes in the Valve Plate with the holes/dowels in Valve Body and set into place. Care should be taken not to
damage the finish surface of the Valve Plate.
3. Dip the screws into RTV (Dow Corning #732 or GE #108) to within 1/8 inch from flat surface on bottom of the screw head.
4. Position screws through countered-bored holes in Valve Body and install into Valve Plate.
5. Tighten both screws securing the Valve Plate to the Valve Body. Screws should be torqued to 19 in. lbs.

7.8 Replacing diaphragm valves

Two models of diaphragm valves are used in some analyzers. These valves are differentiated by the number of screws in the
valve cap, with one having four screws in the cap and the other having one screw in the cap.

7.8.1 Preparation

Ensure that there are no hazardous or flammable gases present in the immediate area of the analyzer.
The purged electrical section of the analyzer will be declassified when purge is removed, and a danger
exists for fire, explosion, damage to property and injury or death to plant personnel during the non-
purged time. Obtain proper permits such as hot work, etc.
Ensure adequate ventilation in the analyzer shelter.
1. Stop the analysis at the end of a cycle.
2. Turn off sample and air to the analyzer.
Verify that the oven is cool (ambient temperature) before removing carrier gas.
SI/PGC5000-EN, Rev B
SCREWS
7 Subassembly repair
70