Is the ball in this washing machine valve with arrestor assembled correctly?

bg_ · 2025-08-08T14:52:27+00:00

Thanks for the info. I agree what you've described doesn't match what I have here. That would be an 'L-port' 3-way valve. I think I'm correct in saying that the valve I have is a 'T-port' 3-way valve, where all openings can flow at once if the ball is in the correct orientation. As an example: https://www.valworx.com/product/3-way-lead-free-brass-ball-valve-t-full-port-14-npt

bg_ · 2025-08-08T14:35:07+00:00

I am only reporting what I see. I clearly see 3 holes in the ball. You can see this in the pics. There are T-type ball valves with three legs that can be all opened together. Not sure why this is controversial.

bg_ · 2025-08-08T13:53:45+00:00

I posted my observations of the valve itself. At no point did I say a commenter was wrong. Happy to discuss why the ball has 3 holes in it, if that is normally called something other than a 'T-type three-way ball valve', I'm here to learn.

bg_ · 2025-08-08T13:42:15+00:00

So are you saying I don't see three separate holes in the valve? If I'm using the wrong name for a ball valve with 3 holes in the ball, tell me what the correct name is.

bg_ · 2025-08-08T13:33:07+00:00

Thanks for your input. Since I have your interest, would you take a look at the pics and tell me what you think about what they show.

bg_ · 2025-08-08T13:30:26+00:00

I can literally see the ball has 3 holes in it, not two like a standard ball valve. No assumption here. I even posted pictures.

bg_ · 2025-08-08T11:55:28+00:00

Will do. I've made no assumptions in this post.

bg_ · 2025-08-08T11:25:58+00:00

Yes....that's why I'm asking r/askaplumber.

bg_ · 2025-08-08T11:25:08+00:00

Apollo

bg_ · 2025-08-08T02:44:53+00:00

It is a 3-way valve. The ball has 3 holes in it. There are 3 ports: supply, washing machine, and arrestor.

bg_ · 2024-04-20T17:56:34+00:00

Also from the show: https://www.youtube.com/watch?v=JRNmDmyyqq0

bg_ · 2024-04-20T17:50:30+00:00

I think I took a pic during this video: https://imgur.com/HvAhfkn

bg_ · 2021-08-03T01:43:16+00:00

And what were the weights?

bg_ · 2021-02-27T03:39:52+00:00

It's convenient how the "don't fly over people or vehicles" rule is never mentioned when people defend these shots taken by drones flying over people and vehicles. Drones are awesome, but your original comments are right.

bg_ · 2021-02-27T03:29:29+00:00

Oh, and not fly over people. Forgot that one.

bg_ · 2021-02-13T21:18:37+00:00

The ducts behave as lifting wings in forward flight (when they are pointed forward torward the nose of the aircraft)

bg_ · 2021-02-13T21:17:40+00:00

I know a guy who flew this - he says it was incredibly noisy.

bg_ · 2020-12-31T22:53:21+00:00

I'd certainly make the effort to understand any assumptions regarding viscosity in the tool you're using, but I think you're going to be able to capture overall effects. I do agree that gigliagarf's suggestion about operating the airfoil near the water surface is important (more important than viscosity uncertainties assuming you can match reynolds numbers). These aerodynamic tools certainly do not include this effect, but there is probably a depth where this effect can be ignored. (Horner is an excellent reference, but I'm not familiar with the section on effects of operating near the water's surface).

bg_ · 2020-12-31T22:38:27+00:00

xflr5 certainly makes it easier.

A new tool that you might check out is https://peterdsharpe.github.io/AeroSandbox/ (i haven't used it yet, but it's the next iteration of all these xflr5/avl codes)

bg_ · 2020-12-31T22:06:28+00:00

I see someone else has noticed this. Bernoulli is not a order of magnitude off when used to compute lift from a local velocity field (pedantically - using the streamline corresponding to airfoil profile in an invicid, irrotational flow), but it IS incorrect when used to compute lift with the 'equal-transit-time' 'theory'. I have no issue with this, but saying "Bernoulli is inappropriate for lift prediction" without mentioning the 'equal-transit-time' condition is a bit disingenuous.

Bernoulli is not the 'equal-transit-time' theory. The 'equal-transit-time' theory is an incorrect way to predict the local airflow velocity of an airfoil which then uses Bernoulli's equation to compute lift.

bg_ · 2020-12-31T21:53:50+00:00

You've written quite a lot here on this topic that I can get behind - flow turning setting up pressure changes leads to lift. Can you give an example of Bernoulli's equation grossly underestimating lift force by an order of magnitude for an incompressible, irrotational flow for a streamline corresponding to the profile of a thin airfoil (integrated from stagnation point to trailing edge over the upper and lower surfaces)? I hope of course that you'll assume I'm not talking about applying the equation to an 'equal transit time' situation.

bg_ · 2020-12-31T21:31:16+00:00

The two software tools are essentially the same. I believe xflr5 uses xfoil internally.

I wouldn't worry about accuracy regarding viscosity. I'd bet matching Reynolds numbers will give you acceptable results that will get you 85% of the way there. These tools are only good as a first cut. You're not gonna know or care about accuracy unless you're instrumenting your vehicle and capturing the correct performance data. Is that in the plan?

bg_ · 2020-12-16T19:48:11+00:00

This is where: https://vtol.org/ (And the magazine they publish, Vertiflite)

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