Hi All
On one side of the solenoid valve is a small volume of liquid in a cylinder, a few cc's. The other side of the solenoid valve is at high pressure. I am hoping that by energising the solenoid I can rely on gravity to empty the cylinder. Then once empty the valve can close and the cylinder be vented before refilling with liquid. I am trying to do this in a fairly short time. I figure that if necessary, I can use a spring loaded plunger to force the liquid out, the plunger being reset when the pressure from the cylinder is vented.
My problem - I think - is that these solenoids use a servo assisted mechanism to ensure that they will open fully. Clearly at the point of opening there will be little or no flow of gas as the liquid inside the cylinder is basically incompressible. Does anyone have any experience of these kinds of solenoid valve? Do they have to be mounted for a given flow direction ? Initially the flow will be inwards to equalise the pressure in the cylinder, then gravity or spring assistance will cause the liquid to flow in the opposite direction.
I am also thinking of using a high voltage current limited pulse to improve the opening speed. The solenoid will only be open for perhaps 0.2 seconds every 3 or 4 seconds so any coli heating effect will be negligible.
It would be nice to use a non assisted solenoid with a reasonable orifice size then this issue would not arise, however I figure I need an orifice size minimum 9mm diameter (63mm2).
This is the solenoid valve I hope to use :
http://www.store.connexion-developments.com/max-pressure/20-bar-max-pressure/ys-20bar-brass-solenoid-valveMany thanks for your time
Best Regards
picclock
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