I need to control the following 2 ways direct solenoid valve ("Series 252 D01") :
https://www.emerson.com/documents/automation/catalog-series-252-dental-manifolds-asco-en-6779448.pdf
It is rated at 24 VDC. If I apply this voltage, the valves opens (it is normally closed) and it consumes approx. 170 mA (meaning its power is 4 W).
But the valve also opens up at approx. 15 V (it consumes 100 mA -> 1.5 W). Once it is opened, I can go down to 3 V (it consumes 0.18 mA -> 0.5 W), and closes at 2 V.
Because the solenoid heats up at 24 VDC (approx. 50 °C after 15 min), I was wondering if I could control it as follows : I open it at 24 VDC and maintain its opening by reducing the voltage to 3 V. I can achieve this behavior with a PWM and a transistor.
Do you think it is a good or a bad idea ? What could go wrong ? Is it something which is usually done or not at all ?
If not, is it possible to reduce the heat while maintaining the proper functionning of the valve ?
Thanks.