Installation, Operation and Maintenance manual
40
Downflo
®
Evolution
Diaphragm valve
Valve disassembly
Disassemble in an orderly fashion. Pay careful attention to exploded views provided
for identification of parts.
1. Remove the clipring from the valve body to remove the bonnet. Use a screwdriver
on 3 places at the bonnet, start removing the clipring on the inlet side. Then
remove the piston/diaphragm assembly.
2. Remove pipes if necessary and in that case remove the pipe o-rings from the
body with a suitable device.
3. All parts are now accessible for cleaning or replacement.
Valve reassembly
Reassemble in reverse order of disassembly paying careful attention to exploded
views provided for identification and placement of parts.
Lubricate all gaskets and o-rings with high quality silicone grease.
1. Replace piston/diaphragm-assembly.
Locate bleedhole in piston/diaphragm opposite to the valve inlet for the
best performance.
2. Replace the clipring on the body, with the open end towards the inlet side of
the body. The legs of the clipring should point outwards from the valve and they
should be evenly spaced from the stop in the groove.
3. Replace the bonnet by pressing it firmly against the piston/diaphragm. Use pliers
to press the ends of the clipring together.
4. Replace pipe o-rings, then slip the clamp o-rings over the inlet pipe. Replace
the valve on the pipe and move the clamp o-ring over the pipe against the valve
body. Replace the clamps and torque the clamp screws according to torque chart
(16 Nm ± 2Nm). The clamp o-ring is necessary to fixate the valve in place.
5. After maintenance, operate the valve a few times to be sure of proper operation.