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Re: alternative inspiratory valve


 

many thanks - I'll try to get the engineering student to ponder the design and see what they come up with.

Erich Schulz,?mbbs, mba, fanzca
0410 277 408


On Tue, 14 Apr 2020 at 09:30, MA <wa9zco@...> wrote:
Your Welcome Erich,

Yes you can use my photo.

Yes & No, the existing 24vac solenoid needs to remain in place to plug the hole but is not used.? There is a small press fit stainless steel tube in the center that must be removed.? This is the existing valve pilot supply which is no longer needed.? The hole that the tube comes out from needs to get plugged and I used a #6-32x1/4" screw.? Another screw needs to be put into the center of the movable spool to plug that hole also.? Next the spring needs to be moved from the top of the valve spool to the bottom so it pushes the valve spool to the open position.? The valve will work with the spring in the position but it would work longer if there is a small plastic part inserted to balance the spring base so it operates in more of a straight position.? The Orbit valve will not be a normally open valve requiring pressure to close the valve.? The valve does not require much pressure to close the valve.? My test required about 4psi.? Next thing is to remove the valve drain plug and insert a small plastic flexible tube that will be used to pressure pilot the valve to the closed position.? A remote external pneumatic valve is required to pilot operate the Orbit valve.? The remote pneumatic valve should be a three way valve using the normally open position to keep the Orbit valve closed until the pneumatic pilot valve is operated.? The coil on the pilot pneumatic valve should be 12vdc.? The unused port of the pneumatic pilot valve should remain open to vent pressure from the Orbit valve.? The pneumatic supply pressure should come from the inlet side of the inhalation valve.? I ordered a pneumatic valve but it is not hear yet so cannot send a picture. ?

Enclosed is a link to the pneumatic valve I ordered:



Please let me know if you have any questions.

Marc Alan
WA9ZCO

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