6 replies to this topic

[Gimdi]

Hello.

I've got a problem. I'd like to calculate torque for butterfly valve. Data: air velocity v, pipe diameter d and pressure P. Can anyone help me?

[chenblue]

Hi,

It seems that there is no simple model to calculate the torque for butterfly-valve. All the calculation I have seen are numerical model, like the links below.

http://espace.librar..._afmc_16_07.pdf
http://scitation.aip...amp;prog=normal

[katmar]

Valve maunufacturers supply tables of required torques for their valves. The torque varies between manufacturers and styles of valves and I would never try to calculate it with a generic method. Request the table from your supplier.

[Gimdi]

Thank you for your advice. I'am going to use a software Ansys Fluent. I hope so it will be bull's eye

katman: I'am a valve designer

[djack77494]

Seems like you've got the right approach. At any particular valve position, the force on the upstream face will be the dynamic pressure * area. The force on the downstream face will be the static pressure * area. So, you must overcome this difference plus friction.
Doug

[fallah]

Seems like you've got the right approach. At any particular valve position, the force on the upstream face will be the dynamic pressure * area. The force on the downstream face will be the static pressure * area. So, you must overcome this difference plus friction.
Doug

I think the force on the upstream face would be "Dyn Pressure+Static Pressure*Area".
Regards

[djack77494]

I think the force on the upstream face would be "Dyn Pressure+Static Pressure*Area".

Quite correct. I was thinking "total pressure" which = static + dynamic. My finger must have slipped.