Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


continuous recirculation loop

continuous recirculation loop

continuous recirculation loop

I have a trouble, we have to design a continuous recirculation loop with a water storage tank and a pump with a bladder type tank. The discharge pressure should be 40 - 60 psi (requirements of equipment connected to the line), and the pressure at the return line must be near 22 psi (requirements of equipment). But the losses in the system are 32 psi. The question is if I could set a relief valve at the last point of the return line, which open at 22 psi.  Could it work right?

RE: continuous recirculation loop


A reliev valve is a connection to atmosphere with is an out for your system which would mean its not a closed loop anymore.  What is the system used for and are there any demands on the system that will use flow?  The use of the bladder tank will mean that pressures will keep stable around your set point so the demands will be critical to meeting your suction pressure requirement.

give us a bit more info...


RE: continuous recirculation loop


You can do it with specifying your back pressure (what ever it is) on the relief valve when you order it. There are Back Pressure Control Valves already available. Try one.


Repetition is the foundation of technology

RE: continuous recirculation loop

Not sure what the problem is:  If you provide a pump (or pump and throttle valve) that produces 54 psig, you'll have enough pressure at your first use point, and with a drop of 32 psi you will have enough at your last use point = 22 psig. (?)     If however, the flow in the system will vary due to different demands then the 32 psi will vary.  To keep the presure to the last piece of equipment relatively constant at 22, you would install a  pressure regulator in the branch from the loop to that equip. set at 22 psig.  (a relief valve is not appropriate)   In that case the pump can be set to discharge as high as the 60 psig

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close