Check valve on pressure tank?

[Mckeand13]

I've got a Wellmate SP-9 Hydropneumatic pressure tank to replace my older galvanized Hydropneumatic tank.

The plumbing directions that came with the new tank state that a check valve should be installed before the inlet of the pressure tank before the pressure switch and other items.

My current galvanized tank does not have a check valve installed and is using the (I'm guessing) 50yr old plumbing. I also heard from a local (Milwaukee area) plumber that it is against code to have a check valve installed. If there were a problem with the line running from the well to the tank, it could allow leeching into the line since there would be no pressure.

That didn't quite make sense to me though as there would be a foot valve at the pump effectively checking the system correct?

I'll admit that I'm not real knowledgeable about these systems. Not sure what sort of device I have in the drop line letting air into the system if that makes a difference.

What is the correct way to install this tank?

Thanks.

http://www.wellmate.com/pdf/UT_HP_SPTank_Install.pdf

 

[Cacher_Chick]

Your system probably has the air bleeder and check valve in the well's drop pipe. No additional check valve is needed.

 

[Sponsor]

 

[NHmaster]

If you have a submersible pump ( in the well) it probably has a check valve already on it. so you don't need one at the tank. Set your tank pressure 2lbs below the pressure switch cut in pressure with the pump and water pressure off they system.

 

[Mckeand13]

If you have a submersible pump ( in the well) it probably has a check valve already on it. so you don't need one at the tank. Set your tank pressure 2lbs below the pressure switch cut in pressure with the pump and water pressure off they system.

I can't set my pressure in the tank. The AVC takes care of the work.

 

[Ballvalve]

If its worked for 50 years and your tank has got air in it and its not water logged, forget any more work, let it be. Probably your water has enough air in it naturally to keep the tank full - after 50 years your air intake and bleeder valves [if any] must be clogged up.

You can add air to your tank with an air compressor to add to the draw down amount if you are so inclined.