If its just the 0 -> 10 V into a 0 ->1.4A, then build a
precision rectifier as per inventor(y)'s suggestion, then use an op-amp
with a power transistor using the solenoid as its collector load, and a
low value resistor (1 ohm) in the emitter circuit. So now you have a
monitoring point for the solenoids current. At 1.4A out, there will be
1.4V dropped across this resistor. So connect your feed back resistor
from this point to the - input of the amp with another resistor to earth
also from the - input. These resistors set your range in terms of
Vin/Iout. Feed the actual voltage into the + input of the op-amp.

leaky safety valve and/or sight glass
The leak came about when I changed the seals on the sight glass; a
rather complex task and, in my case, expensive too (in that

I broke 2
sight glasses in the process). I had to change the seals because there
was leak on the lower seal on the safety

glass. (FYI, the first sight
glass I broke was due to clumsiness. I grabbed the glass instead of the
frame in handling the

machine. The second was due to tightening the
lower nut too much and cracking the glass).

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2011-08-29

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