Technical information


Response time, cycling rate
The response time of a solenoid valve is the lapse of time between the electrical signal and the outlet of a fluid signal. The C.E.T.O.P. defines the test conditions as follows:

Test pressure : air at 6 kg/cm2
Ambient temperature : 20°C

Response time at energizing
Lapse of time between energizing of the solenoid until the outlet pressure reaches 90% of the maximum test pressure (see chart for AC and DC).

Response time at de-energizing
Lapse of time between de-energizing of the solenoid until the pressure outlet drops to 10% of the test pressure (see chart for AC and DC).

Effect of alternating current on response time
The response time of a solenoid valve operating on alternating current depends on the phase of the current at the time of the electrical command. If the command is given at an unfavorable moment, the system will be delayed for a fraction period, which is generally unknown, until the available current is sufficient to re-activate the solenoid valve. This lapse of time should be added to the nominal response time of the solenoid valve.

Cycling rate
The cycling rate of a solenoid valve depends directly on its response time. It is the number of cycles per minute calculated for continuous operations. The valve should not be reversed at less than 90%, or above 10% of reference pressure. The cycling rates shown in this catalog are the maximum possible cycles per minute of the solenoid valve. It varies when the valve is mounted in a circuit which then depends on the installation pressure drop.


6O sec
Cycling rate =
[cycles/minute]
T3 + T4

Measuring response time


A: Switch on command signal T1: Self-induction time of coil after T1 plunger starts action
B: Switch off command signal T2: End of plunger action
U: Voltage T3: Pneumatic response time at energizing
I: Current T4: Pneumatic response time at de-energizing
P: Pressure