I am trying to determine the actuator torque required for my metal seated, eccentric (meaning offset) butterfly damper. I am using formulae from Appendix A of AWWA C504-87, titled "Suggested Method for Calculating Torques Required to Operate Rubber-Seated Butterfly Valves".
The formula for...
I am trying to size the actuator required to operate my Eccentric Butterfly Damper. To do so, I am trying to determine the Hydroynamic Torque that air flow would induce in the damper's installed state.
The software I am using is the Cosmos FloWorks plug-in for SolidWorks.
The approach I am...
I am using Cosmos Floworks to model and measure the hydrostatic torque that the flow of air would have on the disk of a butterfly damper.
The mass flow rate of air at the inlet is 15.3125 lbs/s, the pressure is approximately 14.477 psi. Since the system has a pressure drop of 0.725 psi, I am...
I am trying to determine the torque requirements of butterfly style dampers for air service. The dampers will be eccentric and range in size from 24" to 84" in diameter. Furthermore, they will be custom fabricated and NOT cast. The torques I am considering are Seating, Packing, Dynamic and...
I am planning on performing an AIR leakage test on a butterfly style damper intended for GAS service. My plan is to fasten blind flanges to both sides of the damper. One blind flange will have an air connection to connect to a air compressor. The other blind flange will have a flow meter...
I am trying to determine the resistance coefficient, K, of a single-offset, butterfly style damper. Since, there is no readily available data for dampers I was going to utilize the K values of butterfly valves. Unfortunately, the formulas available are limited to sizes below that which I am...
I previously posted a thread, “Cv and acceptable leakage of air,” http://www.eng-tips.com/viewthread.cfm?qid=205910&page=1. In that thread, MikeHalloran, mentions that you can correlate Cv to air flow, but that he didn’t know how to do it off the top of his head. I was hoping either he, or...
We have a butterfly style damper for air service on an industrial system that was certified by the manufacturer as ANSI/FCI70-2 Class IV, which allows for a leakage rate of 0.01% of damper capacity. The Cv of the damper is 32042 and if we were to do a water test, at 1 psi differential, we would...
