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  General Informations
 
VERNET has been producing thermostatic elements for more than 50 years.

VERNET is one of the world's leaders in this area. It's expertise and continuing quality of research justifies their position as a major supplier to the car industry and leader to most sanitary and heating installation manufacturers

VERNET thermostatic elements transform calorific energy into mechanical energy using the expansion of wax from its solid state to its liquid state (heat provokes mechanical movement).
There are two different types of elements : flat diaphragm and squeeze-push designs.

We can identify two families of elements :

  • Flat diaphragm elements,
  • Squeeze-push elements.
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    Flat Diaphragm
    Elements
     
     
     The thermosensitive substance contained in the CUP transfers pressure to the PISTON by means of the DIAPHRAGM and the BUFFER, tightly in position in the GUIDE.
    The design of VERNET elements avoids any penetration of fluid into the piston area.
    On cooling, the initial position of the piston is obtained by means of a return spring. FLAT DIAPHRAGM elements are particularly noted for their high level of accuracy, and so are used mainly in Sanitary Installations and Heating.
     
     
     
    Squeeze-Push Elements
     
     
     They contain a synthetic rubber part shaped like the 'FINGER OF A GLOVE' Pressure from the expansion of the thermostatic material moves the piston with a lateral squeeze and a vertical push.
    As for the flat diaphragm element, the piston returns to its initial position by means of a return spring. These elements are slightly less accurate but provide a more powerful stroke.
     
     
     
    General Characteristics
    Altitude
    Height reached by the piston compared to its initial starting position. N.B. Different starting positions can be chosen (see ADAPTABILITY)

    Stroke
    Movement of the piston. The ideal stroke corresponds to the temperature range of the elements, and according to the type of element can vary from 1.5 to 16 mm.

     
     
     Temperature range
    Lies between the minimum and maximum operating temperature of the element. VERNET elements can cover temperatures ranging from -10°C to +120°C.

    Hysteresis
    The difference noted between the upstroke and downstroke curve. Hysteresis is caused by the thermal inertia of the element and by the friction between the parts in motion.

     
     
     Curve
    It represents the movement of the piston in relation to the temperature. It can be a continuous or broken line. The angle varies according to the composition of the waxes.
     
     
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