Thermostatic cartridge for a mixing valve

A thermostatic cartridge for a mixing valve, the mixing valve being intended for mixing a cold incoming fluid and a hot incoming fluid in a determined proportion to form a mixture having a mixing temperature, the cartridge comprising a head defining a housing extending along a central axis of the cartridge, and a thermostatic regulating assembly for controlling the mixing temperature, said thermostatic regulating assembly comprising:

• a regulating system at least partially received in the housing and defining an abutment surface adjustable in axial translation relative to the head,
• a thermostatic system comprising at least a first heat-sensitive portion over which the mixture is intended to flow, and a second portion adapted to abut axially against the abutment surface, the first portion being adapted to move the second portion axially between a plurality of positions relative to the first portion, the relative positions being determined by the mixing temperature;
• and
• a slide mounted on the first portion, the slide being movable in axial translation relative to the head between a plurality of slide positions, movement of the slide from one of these slide positions towards another being intended to change said determined proportion,
• wherein:
• the slide is mounted with the ability to slide on the first portion of the thermostatic system between a normal position relative to the first portion, and a plurality of overtravel positions axially closer to the head than the normal position relative to the first portion, and
• the thermostatic system comprises a safety spring adapted to exert an axial force on the slide, the axial force being directed from the abutment surface towards the second portion.