| 摘要 |
Thermostatic control device for controlling valves provided with an axially movable stem, includes a base body, an electrically operated thermostatic actuator, and intermediate connecting elements between the thermostatic actuator and the stem of the valve; the device also includes a cap assembly, having a cylindrical portion secured to the base body, and a control knob, movably supported by the cylindrical portion, the knob being operatively connected to the stem of the valve. The cylindrical portion and the knob have cam elements conformed to cause an axial movement of the knob by its manual rotation; the device also includes disengageable retaining elements for retaining the knob in an open position of the valve, and torsional spring elements for automatically returning the control knob to a closed position of the valve upon disengagement of the retaining elements from the knob.
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