UK trade guideShower Spares 4 min readUpdated 11 July 2026

How to Replace the Flow Cartridge on a Aqualisa Quartz Digital DCV (UK)

UK guide to swapping the flow cartridge in a Aqualisa Quartz Digital DCV shower valve. TMV2 compliance, part numbers, tools.

Aqualisa

The part

Fit a new flow-control cartridge on the Aqualisa Quartz Digital DCV to fix stiff or leaking on/off — usually a 1/4-turn ceramic disc.

Isolate

Close the built-in isolators on the Aqualisa Quartz Digital DCV valve body — accessed through the escutcheon plate.

Swap the flow cartridge

Some Aqualisa valves use handed cartridges (L/R). Match the flat on the spindle to the handle orientation before refitting.

Commission

Balance hot and cold to within 0.5 bar. Run the Aqualisa Quartz Digital DCV at max flow for 3 minutes.

Verify max outlet temperature stays below 46 °C per BS EN 1111 by shutting off cold and reading the outlet.

Frequently asked questions

Standard or reversed?
Standard Aqualisa cartridges close clockwise. Reverse handles will require the -R variant.
Any grease?
Silicone grease only — petroleum jelly attacks the EPDM seals.
OEM or aftermarket for Aqualisa?
For TMV2/TMV3 compliance always fit genuine Aqualisa cartridges. Aftermarket voids the Quartz Digital DCV approval.
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