Actual passage size of valves

[wooden_reefer]

What do you think is the actual diameter of the passage of a nominal 1" ball valve?

1.5" valve?

If one is going to place a valve to the drain (isn't it nice to have in panic stage?), then one should consider the actual size of the passage of the valve.


One can first expand and then reduce and have a bigger valve in between.

 

[barbra]

You're right. Smart folks use a bigger valve and bush it down.

 

[woz9683]

That's true for most cases, but some ball valves are much closer to the same ID as the pipe they fit (Hayward, for example).

You really ought to just check the ball valves you intend to use. If the ID is significantly smaller than the pipe you are using, yes you probably want to bush up to the next size valve.

 

[woz9683]

Oh, and wooden_reefer, I can't answer with actual sizes because the ID is different from brand to brand. I can say that a 1" Hayward measures 1" ID, a 1.5" Hayward measures 1.5" (this is not the norm though).

Also, Smart folks do research to make sure their parts are compatible. They don't blindly follow generalities as absolutes .

 

[wooden_reefer]

<a href=showthread.php?s=&postid=10653463#post10653463 target=_blank>Originally posted</a> by woz9683
Oh, and wooden_reefer, I can't answer with actual sizes because the ID is different from brand to brand. I can say that a 1" Hayward measures 1" ID, a 1.5" Hayward measures 1.5" (this is not the norm though).

Also, Smart folks do research to make sure their parts are compatible. They don't blindly follow generalities as absolutes .

Can I find Hayward in most plumbing places?

 

[barbra]

No, Hayward is sold be reps. Their waterway sizes are better, but still restrictive.

 

[wooden_reefer]

I found out that valves that have the same diameter as the pipe are called "true union" valves.

Is this what you guys are talking about?

 

[kgross]

True union valves mean that they have unions on each end of the valve. But normally true union valves are higher quality so they should have larger internal diameters of the water passage. Just remember that the unions will also restrict the flow. Anytime you change the wall of the pipe it will restrict the flow, IE, coupling 2 pipes together will cause more restriction than one longer piece of pipe. The amount of restriction depends on the velocity of the water flowing in the pipe. slow down the velocity by going with a larger diameter pipe for everything and you will get less restriction and more flow. If you think you need 1 inch pipe, use 1 1/2 inch pipe then you do not have to worry about the restriction from elbows or valves.

Kim

 

[woz9683]

Yes, the Hayward valves I was referring to are true-union valves. You can find them (along with many other types and brands) at www.usplastic.com They have pretty good prices on many items, and I've been buying more from them recently. (much cheaper than McMaster in most instances)

 

[vapor1]

Make sure to get the Hayward "full flow " True union ball valves . The opening in the ball is the same size as the pipe.