Eluent Cap Air Filter (Shut-off Valve)
If the HPLC pump works and
extracts the eluent from the bottle, it causes a vacuum in a closed system. To
avoid this, you need to use pressure compensation.
For this reason we suggest using our Vision Eluent Safety Shut-off Valve (VLV-SF1), which is a one-way valve - on the inlet side, it contains a 0.22µm PTFE membrane, on the outlet side is a silicone duckbill valve. In normal usage, the membrane can accumulate dirt, and the duckbill valve can wear out, so it is mandatory to change the Air Filter every six months.
The best visible indicator that it is time to change the filter is the Timestrip sticker. After the Air Filter installation, just start the Timestrip sticker by slightly pushing the button until a straight red line is visible on the screen. After 6 months the screen will become red, then you will know to change it.
VLV-SF1 Shut-off valve for Safety Caps with 1/4''-28 port
VLV-SF1-03 Shut-off valve for Safety Caps with 1/4''-28 port, 3 / package
VLV-SF1-10 Shut-off valve for Safety Caps with 1/4''-28 port, 10 / package
VLV-PF1 Shut-off valve for Prep (up to 1500ml/min) Safety Caps with 1/4''-28 port