×
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!

*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

Hydraulic restrictors

Hydraulic restrictors

Hydraulic restrictors

(OP)
How do I have to calculate the pressure drop over a restrictor? If I calculate it with the formula stated below, the pressure drop will be huge!!!

Q=Cf*A*SQRT((2*differential pressure)/Density)

A=0.7 mm^2
Q=1.66 GPM
Density=0.997 g/ml

The units have to be calculated in cubic meters and liters (liters/second). The Cf is mostly in between 0.6 and 0.9, but I don't know what the right value of it is. If somebody does know how I can determine the value of it, it would be really great!

Thank you in advance

Ps: the system pressure is 3000 PSI (20,7 MPa)


RE: Hydraulic restrictors

The equation is correct, and at 3000 lbs initial pressure, the drop will definitely be huge.

The coefficient varies due to the type of orifice.  A sharper-edged orifice will give closer to  0.6, a well-rounded edge will give as high as 0.98.

It also varies with the length of the the constriction, relative to its diameter.  Bump it down roughly 0.1 with L=0.5D, up 0.15 for L=2 or 3 D.

The value of C is really an engineering judgement, there are numerous references to back you up.

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



News


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