Mixing valve anti-scald apparatus

Abstract From the Canadian patent

Anti-scald apparatus for inclusion on a water mixing valve of the type commonly used in showers. The apparatus permits normal manual operation of the valve from an off position through intermediate positions, that allow mixtures of various proportions of hot and cold water to pass through the valve and toward the maximum temperature hot water position. However the valve cannot be adjusted to reach this maximum temperature position without the performance of a positive manual procedure by the, valve operator thereby reducing the possibility of accidental or inadvertent scalding. Stop means carried by the valve operating handle and easily accessible to the valve operator cooperate with a …