Sanitary mixing unit

Sanitary mixing faucet comprising:

• a cartridge having an outside housing,
• a quantity adjustment means in the outside housing,
• a temperature adjustment means, and
• a thermostat means,
• wherein the quantity adjustment means has a stationary valve disk and a rotating valve disk which interacts with the stationary valve disk, wherein an inside housing is coaxially supported in the outside housing in a manner enabling coaxial rotation of the inside housing relative to the outside housing by at least 180°, wherein the thermostat means is located in the inside housing, wherein the rotating valve disk is joined to the inside housing in a manner precluding relative rotation therebetween, wherein the stationary valve disk is joined to the outside housing in a manner precluding relative rotation therebetween, and wherein an end face of the inside housing that is provided with an engagement section for seating of a first twist operating handle for adjusting a flow amount extends through an opening in an end face of the outside housing, further comprising:
• means for limiting rotation of the first twist operating handle, the means for limiting of rotation having a guide groove for guiding a first projection on the first twist operating handle, and
• a groove which runs in a lengthwise direction of the cartridge in the engagement section for interacting with a second projection on the first twist operating handle.