PGC5000
PGC5000 Series Service Instructions
7 Subassembly repair
SI/PGC5000-EN, Rev B
72
7.8.4 Replacing the diaphragm (one screw type)
1. Remove the hex head cap screw from the center of the valve cap (see Figure 7.18).
Port 1
Cap
Screw
Fig. 7.18. Typical 1 Screw Cap, Showing Port 1 Orientation
2. Lift the cap from the two alignment pins.
3. Set the cap aside in a safe, clean place, with the polished side up so that it does not get scratched.
4. With tweezers or a knife blade under the edge of the diaphragm, carefully lift and work the diaphragm off the alignment
pin. Be careful not to tilt the valve, which could let the plungers fall out.
5. Set the valve on a clean surface, with the base down and the plungers up.
6. Put on powder-free gloves.
7 Remove the new diaphragm from its packaging.
8. Hold the diaphragm carefully by the edges so that the surface is not contaminated or damaged.
9. Slide the diaphragm over the alignment pins with the side marked TOP toward the cap (away from the plungers).
10. Clean the cap thoroughly with an appropriate solvent and a clean tissue or cotton swab, taking care not to damage the
surface.
11. Blow the cap with clean compressed gas to remove any lint left by the tissue or swab.
12. Install the cap over the alignment pins with port number 1 opposite the air inlet (see Figure 7.18).
13. Reinstall the hex head screw in the center of the cap.
14. With a torque wrench, tighten the screw to 45 inch-pounds.
7.8.5 Installing the new diaphragm valve
1. Place the valve in the clamp ring and rotate it to the orientation of the valve that was removed.
2. Using a 7/64-inch hex key wrench, tighten the clamp ring screw.
3. Install the connections to the valve cap, matching the numbering on the valve to the tags on the connections.
4. Using a 1/4-inch wrench, tighten each connection.
