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Re: Stop valve or ball valve?

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Re: Stop valve or ball valve? salty 05-25-2008
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Posted by on May 25, 2008, 8:43 am

>1) You are talking about an application where you operate (open or close)
>the valve perhaps a few times a year.
>
>2) Today, cheap ball valves are availble. Modern materials and
>manufacturing make reliable ball valves last a LONG time without service.
>Since they wear so slowly, by the time it needs "repair" it's likely a good
>idea to just replace it.
>
>3) In reasonable "home" sizes gate valves just have no cost or other
>advantage over ball valves. That said, most gate valves I have seen in
>"household" sizes just don't leak.
>

The problem with gate valves is that if you leave them partially open for long
periods, the gate corrodes away into oblivion. You can turn the stem all you
want, but there is no longer anything connected to it. Gate valves should only
be used in the wide open, or completely closed positions.



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Posted by Edwin Pawlowski on May 25, 2008, 9:39 am

>
> The problem with gate valves is that if you leave them partially open for
> long
> periods, the gate corrodes away into oblivion. You can turn the stem all
> you
> want, but there is no longer anything connected to it. Gate valves should
> only
> be used in the wide open, or completely closed positions.
>
>

Actually, gate valves are often used for throttling of the material in the
pipes. They are better than others because they require more turns from
open to close allowing more precise control. Yes, they do wear and corrode,
but that is a normal maintenance function in a process situation. Home use
is entirely different so, as you point out, full open or closed is best.



Posted by on May 25, 2008, 7:51 pm

>
>>
>> The problem with gate valves is that if you leave them partially open for
>> long
>> periods, the gate corrodes away into oblivion. You can turn the stem all
>> you
>> want, but there is no longer anything connected to it. Gate valves should
>> only
>> be used in the wide open, or completely closed positions.
>>
>>
>
>Actually, gate valves are often used for throttling of the material in the
>pipes. They are better than others because they require more turns from
>open to close allowing more precise control. Yes, they do wear and corrode,
>but that is a normal maintenance function in a process situation. Home use
>is entirely different so, as you point out, full open or closed is best.
>

Please note the name of the usenet newsgroup in which you posted this. They also
use tiny gate valves in some types of surgery. Completely irrelevent here.



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