Installation, Operation and Maintenance manual
25
DFPRE Large Dust Collectors
Figure 16: Clean Air Plenum access cover gasket
Valve disassembly / reassembly
Do not overtighten pipe connections.
Refer also to figure 9.
1. Switch off the compressed air.
Make sure manifolds are depressurized before any work is carried out.
2. Open the clean air access door.
3. Using screwdriver unscrew 4 screws to remove bonnet from valve.
4. Diaphragm assembly is now accessible for cleaning or replacement.
When replacing diaphragm assembly ensure the marking “THIS SIDE OUT”
faces valve bonnet and bleed hole is in alignment with cavity in valve body
and bonnet. The external contours of diaphragm, body and bonnet must all be
in alignment.
5. Replace bonnet and tighten screws according to torque chart (16 Nm ± 2Nm).
Torque 7 Nm (±1). Torque should be applied crosswise.
6. After maintenance, operate valve a few times to ensure proper operation.
