oldnslo
Super Member
Npalen,
Canemek site shows a D03 style valve so depending on its coil and armature construction it might respond to PWM signal like a low end non feedback proportional valve. These valves use the PWM to keep the spool dithering slightly so that it will respond quicker to signal. I.e. a body in motion tends to stay in motion concept. I suspect this system will move the valve in pulses of flow by rapidly opening and closing the valve Vs finer metering of a true proportional valve. Depending on cylinder size, flow rate, pulse time and valve response time this system could provide a reasonable level of control for the average person trying to get something close to grade.
I believe the original Spectra Physics systems from 20 or more years ago that were used on large scrapers being pulled by 4 wheel drive tractors used poppet valves and they just cycled them on and off to get the cylinders into position. They claimed accuracy of quarter inch in 1000 feet.
Canemek site shows a D03 style valve so depending on its coil and armature construction it might respond to PWM signal like a low end non feedback proportional valve. These valves use the PWM to keep the spool dithering slightly so that it will respond quicker to signal. I.e. a body in motion tends to stay in motion concept. I suspect this system will move the valve in pulses of flow by rapidly opening and closing the valve Vs finer metering of a true proportional valve. Depending on cylinder size, flow rate, pulse time and valve response time this system could provide a reasonable level of control for the average person trying to get something close to grade.
I believe the original Spectra Physics systems from 20 or more years ago that were used on large scrapers being pulled by 4 wheel drive tractors used poppet valves and they just cycled them on and off to get the cylinders into position. They claimed accuracy of quarter inch in 1000 feet.