×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Pressure changer

thread407-30425

Pressure changer

Pressure changer

(OP)
Could somebody please tell me how I can vary (increase/decrease)the pressure in a pump/motor setup to compensate for the high and low pressures at the various operating speeds.

RE: Pressure changer

Why not a pump discharge control valve that controls pressure?

RE: Pressure changer

If you have a positive displacement pump you need to design the motor to give max required power for the max pressure.Pressure can be reduced IF REQUIRED by resetting the built in by pass(pressure relief valve).

RE: Pressure changer

(OP)
Yes, but how could I increase the pressure as well. It needs to be efficient

RE: Pressure changer

Variable speed control will change the head of the pump in accordance with:

Q: flow
H: head
P: Power
N: speed

subscript
n:nominal
x:selected spped

Qx/Qn=Nx/Nn

Hx/Hn=(Nx/Nn)^2

Px/Pn=(Nx/Nn)^3

You can get variable frequency control for all pump sizes allthough the (motor control) priciple may vary.

Grundfos (eg) deliver small variable frequency control pumps with build in control, check their web page: www.grundfos.com

Best regards

Morten

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

Resources

White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. 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