When
Leakage is observed around the valve knob when the valve is open.
Leakage is observed on the purge outlet when the valve is closed.
Parts required
Purge valve knob (with integrated seals)
No. | Description |
|---|---|
1 | Purge valve knob |
2 | Ring seal |
3 | Cap seal |
NOTICE
Avoid holding the new valve knob by the seal end. Scratches on the seals will prevent a proper seal and cause leakage.
Additional items required
Solvent suitable for purging to flush out harmful substances
Cleaning swab
Solvent suitable for your application
Preparations
To flush out harmful substances, purge the pump with an appropriate solvent.
Turn off the pump flow and wait until the system pressure is down to zero.
Follow these steps
To remove the purge valve knob from the purge/sensor unit, turn the valve knob counterclockwise all the way and pull it straight off the purge/sensor unit.
Before installing the new purge valve knob, clean the opening in the purge/sensor unit with a cleaning swab.
Insert the new purge valve knob into the purge/sensor unit.
To tighten, turn the valve knob clockwise with your fingers until it is finger-tight.
NOTICE
Turn the valve knob only with your fingers. Overtightening may damage the purge valve seals.
Resume operation.
Inspect the purge outlet. If liquid leaves the outlet, the valve knob may not be tightened enough. Tighten a little more.