Safety control method and device for limiting the temperature of a fluid to a given upper value

摘要

A safety control method for limiting the temperature of a fluid to a given upper value comprising the sensing of the fluid temperature and the control of a servo-motor keyed in follow-up relationship to said temperature and acting upon a member controlling a parameter conditioning said temperature, wherein the improvement consists in the steps of effecting the detection so as to cause the displacement of a movable element through the expansion of a liquid heated up to a temperature varying in the same direction as the sensed temperature and transmitting said displacement through a hydraulic circuit relay to a hydraulic ram actuator forming said servo-motor.