Definox Automatic Changeover Valve DN 63 SMS

Refit the stem/piston and spring assembly the other way around in the body

Check that the snap-ring is properly positioned in its recess

Is the snap-ring damaged or deformed?

Is there any movement of the actuator body during the opening/close operation?

Remove the defective seal using a cutter without marking the bearing surface of the plug

Protect the stainless steel surface using the edge of a steel rule or a plastic off-cut

Set the oven temperature to 140°C (+/- 3%)

Place the new seals in the oven for 30 minutes

Ensure the oven temperature does not exceed 200°C

Check if the temperature is adequate to prevent seal deformation or tearing during installation

Ensure the air supply is closed and the circuit is purged

Ensure the mains supply is switched off

Disassembling the Signalling Box

Refer to ICS LED Maintenance notice NM-258

Refer to ACS LED Maintenance notice NM-259

Refer to NM-182 for the ICS control top

Refer to NM-187 for the ACS control top

Disassembling the DCX3 Valve Clamp Collar

Use medium thread lock compound to lock the plug during reassembly on the actuator

Retighten the plug of diaphragm valves after first usage with temperature

Supply air to the actuator before tightening the clamp collars

Is the valve operating normally?

Describe any difficulties encountered during operations

Ensure the actuator configuration is set to NC, NO, or DA as required

Lubricate all parts with appropriate lubricant

Center the piston using the guide pin on the actuator stem

Fit the lantern seal [18] [18b] carefully using the press

Position the snap-ring (16) properly in the recess of the body before releasing pressure