Review on Motorized Stainless Electrical U S Solid by Paul Letho

Closing time is 3.5s at 13.8V, 7s at 7V, 5s at 9V and about 3.5 seconds over 10V (tested to 15 AT only). I am running a PWM on the yellow wire to slow it down by a 10 second closing time using a microcontroller driving a system with two of these valves. Prevents sudden pressure surges from damaging the reverse osmosis membrane and other filters. Also used for automatic flushing of the membrane for the same reason, without sudden impacts/water hammer on sensitive materials and the entire plastic system. The soil must be modulated to slow it down in order to meet the 10 psi/s rate of change specified by the membrane manufacturer. This is MUCH higher and higher, almost all commercial systems use a cheaper solenoid valve, but this damper is not suitable for thin film diaphragms. Currently working within specification to see if the membrane lasts longer than 6 months. If there are no updates, then everything worked. Has been working great for a month now. Power wiring: SPDT relays with 12V common, NO -> blue and NC -> red for normally open. The yellow goes through a PWM modulated MOSFET to control the opening and closing speed in software using a pressure transducer and flow meter feedback. Home systems probably don't need this level of specification, but if you're bored and want a project, I've made the code open source. I'm writing a port of this for Arduino right now, so it's a plug and play system that doesn't require any programming/electronics/systems knowledge. With DI resin, these valves will pay for themselves 100 times a year in polymer life savings alone.