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I have a new valve. It is a solenoid type quick exhaust valve. The valve is electronically actuated.  It is very similar to a sprinkler valve.  The red portion is the thick rubber which seals on the seat.  The green unit is a tube which passes from the pilot area (top of diaphragm) to the exhaust port.  The tube is held in place with a nut and washer assembly which sandwiches the diaphragm, and the thick rubber (red).  The diaphragm is blue, and as you can see, it has 2 equalization holes.  Here is where the interesting part starts.  The orange part is part of the solenoid assembly, and is basically a piston with a rubber face on the bottom.  The piston will allow air from the pilot, to the area above the solenoid.  When you trigger the valve, the solenoid/piston piece moves upward, this in turn lifts the piston's rubber face off of the green tube.  Once this happens, the pilot air is released down the barrel, and the valve is actuated.

Now that I have explained the valve's function, here is my situation:  The valve was originally rated for 5psi.  I talked with Chewy about this valve, and figured that I had better replace the original diaphragm.  The point is to keep this valve 100% returnable to original condition.  I made the diaphragm today out of a patch for a tractor tire, which turns out was not a good choice.  It doesn't allow the diaphragm to flex enough to allow full flow into the seat (I.E. chokes flow).  <<< This is another issue [:)]

When the valve has a low pressure, say under 60-70psi, it actuates well (besides the choked flow thing).  When the valve is pressurized to a higher pressure, say over 80psi, it wont actuate.  <b> My thinking is that the air on top of the solenoid/piston is putting more downward force on the piston, than the electromagnet can produce upward force. </b> As a result, the piston is stuck on the green tube (really like a valve seat in a way).

So... I have over analyzed the situation and would appreciate any input or ideas to get the valve to work at higher pressures.  Is there a way to make the solenoid pull harder?  (it is a 110V solenoid)  Is there any way short of making it pneumatically actuated?  I would appreciate any thoughts and comments on the design of the valve.

P.S. Chewy, I bet you know what type of valve this it... It's the 3 incher ######  I decided to try and make a diaphragm without harming the valve.  

 

 
 

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