solenoid valve design
solenoid valve design
(OP)
I'm designing a low profile 3-position system using a DC solenoid(s) to create the motion/forces necessary. To maintain a minimum height - I was planning on using a non-magnetic conical spring (brass/bronze) residing within the bore that will return the plunger to its de-energized origin. Any background info on this concept (good/bad experience)?
Also - are there any inherent probelms / disadvantages with using a permanent magnet plunger (alnico, ceramic, ...) to be able to provide both a pull and return push force by reversing the current? Any experience with this would be helpful.
thanks
Ron
Also - are there any inherent probelms / disadvantages with using a permanent magnet plunger (alnico, ceramic, ...) to be able to provide both a pull and return push force by reversing the current? Any experience with this would be helpful.
thanks
Ron





RE: solenoid valve design
In the event of a loss of power, the valve's position will be indeterminate. Depending on the application, that may or may not present a problem.
Also, the valve become polarity sensitive. Wiring errors will cause problems.
RE: solenoid valve design
Can you elaborate on the polarity sensitive issue?
thanks,
Ron
RE: solenoid valve design
Terminal 1 positive and Terminal 2 ground = "push"
and
Terminal 1 ground and terminal 2 positive = "pull"
and the wires get switched, then the valve will operate opposite to what you expect.
RE: solenoid valve design
thanks
RE: solenoid valve design
The only thing I would comment on the push/pull solenoid with the spring, is that depending on which direction the plungers moving the magnetic force will either be additive or subtractive with the spring force.
regards desertfox