Solenoid proportional valve problem

[Mrs. Robot]

I've got three solenoid proportional, normally closed, valves. They were working fine until I did something...I connected them to this curve:

I know it might sound unreasonable, but it's as soon as I put them there that they stop working (no water passes through). Do to this hypothesis is that two of the valves are now damaged and won't work. In my curiosity, I opened one of the valves and I don't see anything the could be damaged, I don't know if it's the diaphragm system, but I don't see anything wrong with it.



Thanks, before hand.

 

[Harald Kapp]

I connected them to this curve:

Please upload the curve. We can't see it currently.
It will also help to know the type of valve and the operating conditions when they failed.

 

[Mrs. Robot]

The curve is the one shown in the uploaded image and remarked in red rectangle. The valve is a EV260B 032U8053,Servo-operated 2-way proportional solenoid valve.

 

[kellys_eye]

The 'curve' is otherwise known as an elbow joint.

The only potential reason for stopped flow would be the restriction that elbow offers but that is practically zero for all intent and purpose.

You've done something else - switched the power off perhaps?

 

[Mrs. Robot]

I understand that the situation is unreasonable like I mentioned before.

I was going to try out the system's behavior. That's when I noticed that two valves were not working, both of these valves have the joint. I continued by evaluating the situation on an individual basis, by sections. I proceed to try the motor-bomb that you see in the picture, maybe it wasn't working... but it was perfect. I then connected the valve directly to the tank's output, without the elbow. It worked just fine. I then connected the elbow and it stopped working. I tried the valve again without this joint and it worked. I don't know what happened, the joint is 1/2" to 3/8".

On the other hand, before noticing that it was as soon as I made the connection with the joint, I opened one of them thinking that it might have been that the diaphragm was somehow stuck and wasn't opening. But I didn't see any physical damage or incorrect functioning of the system. But now, that one doesn't work.


Thanks for you reply.

 

[Harald Kapp]

motor-bomb

pump (bomba)?

 

[Harald Kapp]

maybe it wasn't working... but it was perfect

How can it be perfect if it is not working? You got me confused.

I then connected the elbow and it stopped working. I tried the valve again without this joint and it worked.

Possibly the joint is mechanically stopping the valve from operating by e.g. exerting mechanical pressure (screwed on too tightly)?

 

[Mrs. Robot]

pump (bomba)?

Yeah, pump.

How can it be perfect if it is not working? You got me confused.

I was trying to explain the procedure I took to verify possible problems: such as errors in physical connections, electronic connections, output values, I also check the mini - pump (the black one shown in the picture above) maybe it wasn't pumping water... (this pump is very silent) so I verified it's correct functioning and it was working just fine. I hope now I made myself understood.

Possibly the joint is mechanically stopping the valve from operating by e.g. exerting mechanical pressure (screwed on too tightly)?

I thought this and I actually tried connecting one of the valves not to tight, but it's still not ok.



Like I said before:

>> I see that there's a problem with the valve - elbow connection. I still don't understand why it could be what you said. The only solution that I see is to eliminate the joint and redistribute the valve connection.

>> On the other hand, I've got two valves that now don't work. They're kind of expensive, we're college students and we don't have much money to invest in more valves. We opened them to see possible problems and see if we could get them to work. In the uploaded pictures is the valve opened and how we are putting it back together. I don't see much to this connection and I don't see what can be wrong with it.



Sorry for such a long message, but thanks for your patience.