The solenoid most likely opens slower because more time is needed to buld up the magnetic field in the coil. The field build up is not linear. It starts building fast but it tries to approach a maximum value (an asymptote). If the field strength necessary to pull against the pressure is close to the maximum value, it takes a while for it to get there. Sorry, I'd need to pull out my math books to explain it better. It is also possible that the rubber seal compressing into the cone around the orifice affects the timing when it is close the the maximum pressure. Stephen Morgret
I have some data on the 3/32 inch orifice solenoid valves now. At 150 psi, 7.47 volts was not quite enough to make them fast enough for our use. They would work, but the delay becomes noticeable with rapid fire. At 140 psi, 7.47 volts was enough to make the operation nice and fast. At 7.92 volts, the solenoid operated fine up to about 190 psi. So, the minimum recommended voltage for the 3/32" solenoids looks to be 7.6 to 7.7 volts. This needs to be low voltage after the batteries have drained a bit. Stephen Morgret Strike Modles
