Waters 1500-Series, Operator'S Manual

Page: 123 / 188

Replacing check valves 5-15
Requirements:
• Replace each check valve and check valve housing as a single unit. Do
not separate the check valve from the housing.
• Before replacing a check valve, move the eluent reservoir to a level
below the pump head to prevent the gravity flow of eluent.
Required materials
• Open-end wrench, 5/16-inch (startup kit)
• Adjustable wrench, 1/2-inch (startup kit)
• Priming syringe (startup kit)
• Replacement check valves (assembled with housings)
• HPLC-grade methanol
• Forceps
Replacing 1515/1525 check valves
The 1515 isocratic and 1525 binary pumps employ a check valve cartridge for
both the inlet and outlet check valves.
To replace a check valve:
1. Purge the pump with methanol (see Chapter 4 ). If methanol is not
miscible with your current eluent, use an intermediate eluent.
2. Use the open-end wrench to remove the check valve housing from the
inlet or outlet side of the pump head.