V0N_hydro
Member
Hi
I have an electro hydraulic valve with coil resistance 22 ohms that takes as +/-12V DC input with 40Hz dither superimposed. The valve controls oil flow to either side of the piston of a pilot servomotor.
There are centering springs on the valve spool so it requires +12V for opening at maximum rate and -12V for closing at maximum rate. There is only one coil on this valve.
The existing amplifier that drives this valve is all analog electronics designed in the 70s and manufactured in the 90s. The fellow who designed it and has previously done repairs is retired a long time ago.
Does anybody know of a product that can drive this valve? I have not found any yet that can handle the polarity requirements.
I suppose this valve is currently driven 'linearly' as opposed to with a PWM signal. I don't see why it wouldn't work with PWM.
Thanks for any pointers
I have an electro hydraulic valve with coil resistance 22 ohms that takes as +/-12V DC input with 40Hz dither superimposed. The valve controls oil flow to either side of the piston of a pilot servomotor.
There are centering springs on the valve spool so it requires +12V for opening at maximum rate and -12V for closing at maximum rate. There is only one coil on this valve.
The existing amplifier that drives this valve is all analog electronics designed in the 70s and manufactured in the 90s. The fellow who designed it and has previously done repairs is retired a long time ago.
Does anybody know of a product that can drive this valve? I have not found any yet that can handle the polarity requirements.
I suppose this valve is currently driven 'linearly' as opposed to with a PWM signal. I don't see why it wouldn't work with PWM.
Thanks for any pointers