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 😊  I hope I can help something with this contributioN

@admin

@nsmve that sounds interesting i have ordered a stepper motor and driver but i would be interested in the details of the valve you have used, did you drive it directly from the stepper or did it need to be geared up/down for best results ?

Regards

Steve

@admin, I am interested to see this design as well

@nsmve interesting. Can you post some more info? A pic? 

@swmotorsport in my case we use a fire extinguishing system valve, it is linear with a stepper motor and it works excellent

I figure the important part is the linearity of the valve i.e.: 100% open = 100% flow  - 50% open = 50% flow etc.

Intermediate angle V-Port valves, such as a 30° or 45° balls, produce a modified equal percentage inherent flow characteristic. Slotted balls or V-shaped holes with small angles result in a ball valve with a linear characteristic curve. Figure 6 shows how the flow characteristic varies with characterized ball valves with different wedge angles.

Posted by: @james-meyers

I used a globe valve and fitted a stepper motor to the stem.  Verify similar to the original Stuska manual control globe valves which have been converted to electronic control in a similar manner as mine in the past.  DEPAC Dave sold a setup that would convert to electronic control back in the day.

Hi James Meyers, owner of Depac dyno control systems Dave Manzolini passed away in 2018 https://www.legacy.com/obituaries/berkshire/obituary.aspx?n=david-b-manzolini&pid=191697811
The depac dyno control system considered to be the best in automotive industry.

Care to share dimensional measurement of the valve you used on the stuska water brake? Also what model stuska was it.

How did you global valve conversion characteristically behaved on you dyno?

Hi Swmotorsport, Doesn't matter whether its spherical or cylindrical body shaped ? Don't know!?

Now you have some machining to do and workout the best size and shape of the V-port 15, 20, 30 ..... 45 degrees aperature opening.

23 Mar 2019 — Here are two examples of water brake valves. Notice the very small water passage for low valve openings. See this link on setting up YourDyno https://yourdyno.com/YourDynoHelp/water-brakes/

Characterized and V-Ball Valves Provide Improved Flow Control

https://insights.globalspec.com/article/10415/characterized-and-v-ball-valves-provide-improved-flow-control

https://insights.globalspec.com/article/10415/characterized-and-v-ball-valves-provide-improved-flow-control

simulationHub
Performance Evaluation of Ball Valve for different V-port Angles

I used a globe valve and fitted a stepper motor to the stem.  Verify similar to the original Stuska manual control globe valves which have been converted to electronic control in a similar manner as mine in the past.  DEPAC Dave sold a setup that would convert to electronic control back in the day.

Thanks for that info it was very interesting,

I have a lathe and milling machine so I think I should be able to make a similar valve and it definitely wont cost $1100 !

Hi Steve , that sucks that the valve was lost.

Have a look at Andrew's thread " Scratch built water brake " and post(s) Yourdyno" using a "Land and Sea" valve.

https://yourdyno.com/community/questions-and-answers-questions-and-answers/scratch-built-water-brake/

https://swarfman64.blogspot.com/2019/08/thor-washing-machine.html?m=1

@mach_1

Hi

I think they said its an early version of the xs111 brake.

I bought it from a college for next to nothing but it had been stripped out and put in storage a few years before and none of the pipework, pumps or valves were there so i am having to build all that up myself.

Also the electronics and pc that were with it were ancient so not even wort trying to get working, i figured that updating it with modern data logging and load control would be the best way forward

Hi swmotorsport ( steve)  welcome to the forum , what stuska water brake is it ?  Why not use the valve that is on it already adaptor a steppermotor  to it??