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Replacing the (optional) active check valve cartridge
Replacing the (optional) active check valve cartridge
Topic LCI-USG-0232, Last Updated 02/26/2025
Users or Waters field service personnel can replace the (optional) active check valve cartridge.
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 personal contamination from contact with biologically hazardous or toxic materials, do not attempt to force or draw liquid or gas through the valve's inlet or outlet ports.
Warning: To avoid eye injury, use eye protection when performing this procedure.
Note: To avoid damaging the
i2Valve actuator, do not attempt to force or draw liquid or gas through the valve’s inlet or outlet ports.
Note: To avoid contaminating system components, wear clean, chemical-resistant, powder-free gloves when performing this procedure.
Required materials
Chemical-resistant, powder-free gloves
Protective eyewear
T8 TORX driver
Active check valve cartridge (if replacing)
To replace the active check valve cartridge:
Using the T8 TORX driver, loosen the four screws that secure the clamping plates by 1/2-turn.
Figure 1: Top of active check valve housing
Shell nut
T8 TORX screw (4)
Clamping plate (2)
Clamping plate tab (2)
Ensure that the shell nut remains free to rotate and that the plates slide open.
Tips:
Avoid touching the clamping plate tabs when loosening the screws.
You can rotate the shell nut to gain access to all four screws.
When both plates are in the maximum open position, remove the cartridge from the active check valve actuator and ensure that the low-pressure gasket is removed with the cartridge.
Tip: If you cannot remove the cartridge from the valve actuator, rotate the cartridge 1/2-turn, and then remove it.
Use the T8 TORX driver to loosen the four screws (by 1/2-turn) that secure the clamping plates on the active check valve housing.
Ensure that the plates are loose and in their maximum open positions.
Tips:
Avoid touching the clamping plate tabs when loosening the screws.
You can rotate the shell nut to gain access to all four screws.
If you are replacing the active check valve cartridge, unpack the new cartridge.
Recommendation: Replace the cartridge whenever you replace the active check valve housing.
Ensure that the PEEK washer is inserted into the cartridge so that its chamfered edge faces away from the cartridge.
Figure 2: Active check valve cartridge
Chamfered edge of PEEK washer (top)
PEEK washer
Active check valve cartridge
Low-pressure gasket
Insert the cartridge into the actuator, grooved end first.
Figure 3: Inserting the cartridge into the active check valve housing
Grooved end of cartridge
Active check valve housing
With one hand, squeeze the two clamping plate tabs on the active check valve housing to hold the clamping plates against the cartridge.
Figure 4: Active check valve clamping plates and tabs
Clamping plate tab
Clamping plates
Clamping plate tab
While squeezing the clamping plate tabs, use the T8 TORX driver to tighten the four screws that secure the plates (see the tightening sequence in the following figure).
Repeat the torquing pattern as shown (at least three times), gradually increasing the torque until the screws are uniformly tight.
Figure 5: Screw torquing pattern
Tip: You can rotate the shell nut to gain access to all four screws.
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
