Replacing The Wedges; Replacing The O-Rings - ABB PGC5000 Series Service Instructions Manual

PGC5000
PGC5000 Series Service Instructions
9. Insert the Carrier Assembly on the Valve Plate.
10. Close the back Carrier Assembly latch. This ensures the Carrier Assembly is locked into the hole in the piston stem.
11. Close the front Carrier Assembly latch.

7.7.3 Replacing the wedges

The four wedges (part number 3527279-1), located on the Carrier Assembly, center the Valve Plate on the Carrier Assembly.
To replace the wedges:
1. Perform the "PREPARATION AND SAFETY" procedure.
2. Open both Carrier Assembly latches by pulling down on the end of the latches.
3. Remove the Carrier Assembly from the Valve Plate and Valve Body, being careful to keep the latches in their open
position.
4. Remove the slider (see "REPLACING THE SLIDER").
5. Note the orientation of the wedges and push out each wedge from the outside of the Carrier Assembly.
6. Insert a wedge from the inside of the Carrier Assembly, being careful not to scratch the Carrier Assembly. Using a cold
chisel, push the wedge into position, ensuring the back of the wedge is against the carrier body.
7. Repeat step 6 for the remaining wedges.
8. Reinstall the slider.
9. Insert the Carrier Assembly on the Valve Plate.
10. Close the back Carrier Assembly latch. This ensures the Carrier Assembly is locked into the hole in the piston stem.
11. Close the front Carrier Assembly latch.

7.7.4 Replacing the o-rings

Since the O-rings are inside the valve, you will have to remove the Valve Body from the analyzer. The O-rings come in a kit,
with different kits for 40-psig and 60-psig CP valves (see Figure 7.13). The rework procedure is the same for both valves.
DESCRIPTION (dimensions are in inches)
O-Ring, Fluorocarbon, 1/4 x 1/8 x 1/16
O-Ring, Fluorocarbon, 2 x 1-7/8 x 1/16
O-Ring, Fluorocarbon, 1-3/4 x 1-1/2 x 1/8
O-Ring, Fluorocarbon, 1-3/8 x 1-1/4 x 1/16
O-Ring, Fluorocarbon, 1-1/2 x 1-3/8 x 1/16
Grease, Molykote 33
Fig. 7.13. O-Ring Kits
It is essential to the analyzer's operation that all valve ports remain correctly connected.
To replace the O-rings:
1. Perform the "PREPARATION AND SAFETY" procedure.
2. Tag each port connection to the valve, using the port numbers stamped on the Valve Plate.
3. Remove the port connections.
4. Remove the air connection on the Valve Body. (You do not have to remove the connection on the Mounting Plate that
attaches to the analyzer.)
5. Using a 7/64- inch hex key wrench, loosen the four screws that attach the Valve Body to the Mounting Plate.
6. Rotate the Valve Body counterclockwise and remove it from the Mounting Plate.
7. Open both Carrier Assembly latches by pulling down on the end of the latches.
SI/PGC5000-EN, Rev B
PART NUMBER
40-PSIG KIT 60-PSIG KIT
764K001N-2 764K001N-1
45051-4-11 45051-4-11
45051-4-35
45051-4-61
45051-4-29
450501-4-31
3616175-1 3616175-1
7 Subassembly repair
68