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Users or Waters field service personnel can replace the pump accumulator 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.
Warning: To avoid eye injury, use eye protection when performing this procedure.
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
Protective eyewear
1/4-inch open-end wrench
5/16-inch open-end wrench
1/2-inch open-end wrench
Replacement accumulator check valve assembly
To replace the accumulator check valve:
Flush the pump with nonhazardous solvent that is miscible with the present mobile phase.
Using the 5/16-inch open-end wrench to hold the check valve in place, disconnect the compression fitting by using the 1/4-inch open-end wrench.
Figure 1: Compression fitting on the check valve
Check valve
Place the 5/16-inch open-end wrench here
Place the 1/4-inch open-end wrench here
Use the 1/2-inch open-end wrench to loosen the check valve, and then remove the check valve assembly from the pump head.
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.
Unpack the new check valve.
Ensure that the new PEEK washer is inserted into the new check valve so that its chamfered edge faces away from the check valve.
Figure 2: Accumulator check valve
Chamfered edge
PEEK washer
Check valve housing
1/2-inch hex nut
5/16-inch open-end wrench flat
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.
Figure 3: Compression fitting on the check valve
Check valve
Place the 5/16-inch open-end wrench here
Place the 1/4-inch open-end wrench here
Using the 5/16-inch open-end wrench to hold the check valve in place, reattach the compression fitting to the check valve.
Tighten the compression fitting with your fingers to the extent possible, and then use the 1/4-inch wrench to tighten the fitting as much as an additional 1/6-turn for an existing fitting, or as much as 1/2-turn for a new fitting.
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
