Waters offers a comprehensive range of analytical system solutions, software, and services for scientists. Liquid Chromatography. Mass Spectrometry. Waters is the leading provider of lab equipment, supplies and software for scientists across the world. Easily research and order everything your lab needs! Waters offers a comprehensive range of analytical system solutions, software, and services for scientists. Liquid Chromatography. Mass Spectrometry. Waters is the leading provider of lab equipment, supplies and software for scientists across the world. Easily research and order everything your lab needs!
Users or Waters field service personnel can replace the pump primary check valve.
Warning: Observe Good Laboratory Practice (GLP) at all times, particularly when working with hazardous materials. Consult the Safety Data Sheets regarding the solvents you use. Additionally, consult the safety representative for your organization regarding its protocols for handling such materials.
Note: To avoid contaminating system components, wear clean, chemical-resistant, powder-free gloves when performing this procedure.
Required tools and materials
Chemical-resistant, powder-free gloves
1/2-inch open-end wrench
Replacement primary check valve assembly
To replace the primary check valve:
Flush the pump with nonhazardous solvent that is miscible with the present mobile phase.
Loosen the PEEK inlet filter nut from the PEEK inlet filter fitting. Do not remove the nut from the fitting.
Figure 1: Loosening the PEEK inlet filter nut from the PEEK inlet filter fitting
PEEK inlet filter fitting
PEEK inlet filter nut
Unscrew and remove the PEEK inlet filter fitting and PEEK inlet filter nut from the primary check valve.
Note: When you remove the check valve assembly, ensure that the PEEK washer, which is normally on the top face of the check valve, does not remain in the pump head.
Use the 1/2-inch open-end wrench to loosen the check valve, and then remove the check-valve assembly from the pump head.
Figure 2: Removing the primary check valve from the pump head
Place 1/2-inch open-end wrench here
Unpack the new check valve.
Note: Verify that there is a PEEK gasket in the groove on top of the check valve and that the chamfered side is pointing up. The check valve can't be installed without the gasket.
Insert the check valve assembly into the pump head, tighten the check valve nut with your fingers to the extent possible, and then use the 1/2-inch wrench to tighten the nut an additional 1/8-turn.
Finger tighten the PEEK inlet filter fitting into the primary check valve.
Note: The following image shows the pressure transducer removed for clarity. The pressure transducer is not removed as part of this procedure.
Figure 3: Reattaching the PEEK inlet filter fitting and the PEEK inlet filter nut
Primary check valve
PEEK inlet filter fitting
PEEK inlet filter nut
Finger-tighten the PEEK inlet filter nut to the extent possible.
To avoid risk of personal injury and to prevent damage to laboratory equipment, always operate your Waters products in accordance with the applicable operational and safety information, your organization’s standard operating procedures, and local regulations.
Pump maintenance procedures
