Technical information

Electrical parameter
The following parameters define a solenoid:

The pull-in voltage is the minimum voltage at which the solenoid valve can be energized. The drop-outvoltage is the one below which the solenoid valve is no longer energized.

Direct current

Alternating current

L = Inductance
= pulsation

The value for power is given in [volt ampere] at inrush and holding at 20°C ambient. The cos is around 0.5 for our typical solenoid coil.

The coil of a solenoid valve is calibrated in relation to the maximum pressure used. A coil that is used with alternating current at a different frequency than the one indicated, will entail modifications in the performance of the solenoid valve. The operating tension needs to be corrected accordingly:

Example: with an equal power consumption of a coil at 50Hz to be used at 60Hz, a correction of tension of about 60/50 of the initial one (50 Hz) is required:

U(60Hz) = (60/50) x U(50Hz) = 1,2 x U(50Hz)

to the contrary:

U(50Hz) = (50/60) x U(60Hz) = 0,83 x U(60Hz)

Shading ring
With an alternating current, the electro-magnetic power is, occasionally, at zero value thus causing the plunger to vibrate. This can be eliminated with the help of a shading ring placed in the operator. The shading ring is a metalic ring, generally made of copper, which plays the role of a secondary winding. The current introduced into this ring generates an electro-magnetic power which is out of phase in relation to the one generated by the solenoid. The magnetic resultant is shifted in relation to the zero power and the vibrations are no longer noticed.

The temperature range is dictated by the kind of elastomere used and the design of the coil. Temperature ranges are indicated for each type of solenoid valve. The coils are generally made of insulated copper wire; the resistance to heat and cold fix the limits of application. The increase of the coil temperature depends mainly on its heating when energized (joule effect), on the ambient temperature and on that of the media (see fig. 13).

Temperature range = function (Tamb , Tbob , Tfluide ).

Please contact us for limit conditions.


  1. The power consumption of the solenoid valve energized with alternativng or direct current decreases with the heating of the coil itself and the increase of the ambient or fluid temperature.
  2. The intensity with alternating current varies with the plunger stroke. It is higher at inrush and lower at holding. It is recommended not to energize a coil with alternating current without it being fixed on an operator tube, otherwise the coil may be damaged. On the other hand, the intensity of the direct current does not vary with the air-gap.
  3. Our coils are designed for 100% continuous duty.