Replace the O-Ring on the Purge Valve

When

Tools required

Parts required

Prerequisites

Switch off pump at the main power switch.
Open the doors of the module.
Use an optional solvent shutoff valve or lift up solvent filters in solvent reservoirs for avoiding leakages.
Remove the purge valve from the pump head.

Disassemble the purge valve.
Remove the old o-ring from the purge valve.
Clean the purge valve parts.
Place the new o-ring on the Screw Purge Valve.
Place the screw with o-ring on the Purge Valve Body.
Place the mounting ring on the screw and push down the o-ring.
Push the screw up and guide the o-ring into the gap.
Place a new frit into the purge valve with the orientation of the frit as shown below (slit in frit points to the front). Reinstall the seal cap including the gold seal.

NOTE
Before reinstallation always check the gold seal in the seal cap. A deformed seal cap should be exchanged.
Install the purge valve to the pump. Make sure not to turn the purge valve body when the screw is fixed to the pump. The o-ring will take damage.
Run the System Pressure Test (see System Pressure Test).

21-Jun-2025