×
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

Formula for Estimating Damper Valve Leakage Rate

Formula for Estimating Damper Valve Leakage Rate

Formula for Estimating Damper Valve Leakage Rate

(OP)
I would be grateful for any and all help.  I am trying to find a formula for estimating damper valve leakage rates.

I replaced a gentleman at a small damper valve company that passed away.  He didn’t leave me any notes on how to do these calculations.  All he left me were answerers.

I found the following formula for discharging a tank through a nozzle in my Fluid Mechanics book.  I thought it would work.

W = A*SQRT((2*g*k*P1^2)*((P2/P1)^(2/k)-(P2/P1)^((k+1)/k))/(R*T1*(k-1))

W = Weight Rate (lbs/sec)
A = Area of hole (ft^2)
g = Gravity (ft/sec^2)
k = Adiabatic Exponent (Air = 1.4)
P1 = Absolute Pressure in the Tank (lbs/ft^2)
P2 = Atmospheric Pressure (lbs/ft^2)
R = Gas Constant (Air = 53.5 (ft*lb)/(lb*Deg R))
T1 = Absolute Temperature in the Tank (Deg R)

I can assume a uniform clearance between the damper disc and the valve body seat of .015”, so I can estimate an area.  All other items are known, except for W of course.  The problem is when I compare my numbers with his numbers; they are not the same.  I am off about a factor of 5.

Does anybody have a better formula to use or is this one right?

Again, Thank You!

Jim

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!


Resources