Exchange the Purge Valve Frit or the Purge Valve

For bio-inert modules use bio-inert parts only!

When

Frit – when piston seals are exchanged or when contaminated or blocked (pressure drop of > 10 bar across the frit at a flow rate of 5 mL/min of water with purge valve opened)
Purge valve – if internally leaking

Tools required

Parts required

Qty.	p/n	Description
1	G7111-60061	Purge valve for G7110B, G7111A, and G7111B
1	G5611-60064	Bio-inert Purge Valve for G5654A (Bio-inert)
1	01018-22707	PTFE Frit (5/Pk)
1	5067-4728	Seal cap assembly (optional)

Prerequisites

Switch off the pump at the on/off switch.
Open the doors of the module.
Use an optional solvent shutoff valve or lift up solvent filters in solvent reservoirs for avoiding leakages.

NOTE
Beware of leaking solvents due to hydrostatic pressure.
Using a pair of tweezers or a toothpick remove the frit.
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.
CAUTION
Damage to the purge valve
- Do not lift the pump using the purge valve as a handle, it might get leaky.
- Do not try to turn the purge valve into the correct position when already fixed to the pump. The rubber o-ring might break.
- Anticipate the correct position of the connections before tightening the valve.
Run the System Pressure Test (see System Pressure Test).

21-Jun-2025