Check Valve failure - WKB117811
Article number: 117811
SYMPTOMS
- Lost Prime error
- Pressure near zero during operation
- Pressure Fluctuation
ENVIRONMENT
- Alliance HPLC System
- Arc HPLC
- ACQUITY Arc
- ACQUITY UPLC
- 2525/2545 Binary Gradient Module
- 2535/2545/2555 Quaternary Gradient Module
- ACQUITY UPLC H-Class PLUS QSM
CAUSE
Primary Check Valve blockage or faulty
FIX or WORKAROUND
- Remove the check valve(s).
- Sonicate the check valve(s) in water, then in methanol, and then in water again.
- Replace check valve(s) if necessary
ADDITIONAL INFORMATION
The sapphire or ceramic ball inside the check valve can get stuck. Hitting it on a bench top will often free it. Avoid hitting when the valve is connected to the pump head or check valve housings.