I am building a controller for a snow plow and have run into one small problem with valve operation. The controller uses multiple contacts switched by one handle. In operation the switch closes two contacts, one for the motor relay and the other for a coil on a hydraulic spool valve. When the circuit is turned off, both motor and valve stop at the same time and cause hydraulic slamming.
I would like to keep the valve (coil) on for approximately 2.5ms longer to avoid the slam. Could I use a capacitor? If so, of what rating would it have to be? The circuit is 12 volts and the coil draws 1.7 amps.