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Butterfly Valve

03/06/2017 7:58 AM

what is the purpose of using butterfly valve in the cooling water inlet of "vapour absorption machines"with two sov in an on-off valve..???

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#1

Re: Butterfly Valve

03/06/2017 9:16 AM

Not enough information on the process. Would need a PI&D schematic to make a better response.

So, with that said....

Does it have a positioner? because then I would have to say some type of throttling valve,... normally you'd have it on the outlet side.

Now if it only has a solenoid for discreet open and close position, then I'd say its to isolate the unit from the cooling flow for service or maintenance and the like. But it will still need a shut off valve on the outlet.

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#2

Re: Butterfly Valve

03/06/2017 11:11 AM

Maybe for one of these reasons:

"Advantages of a Butterfly Valve

Butterfly valves are similar to ball valves but have several advantages. They are small and, when actuated pneumatically, open and close very quickly. The disc is lighter than a ball, and the valve requires less structural support than a ball valve of comparable diameter. Butterfly valves are very precise, which makes them advantageous in industrial applications. They are quite reliable and require very little maintenance."

http://www.processindustryforum.com/article/advantages-using-butterfly-valves

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#3
In reply to #2

Re: Butterfly Valve

03/06/2017 11:20 AM

have to be aware of hammer when operated.

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#15
In reply to #2

Re: Butterfly Valve

03/07/2017 3:53 PM

Also they are cheaper to manufacture.

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#4

Re: Butterfly Valve

03/06/2017 12:40 PM

There has to be a document there somewhere called something like "Process Description", "Operating instructions" or "Bedienungsanleitung", or something. There has to be a telephone number on it somewhere...

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#5

Re: Butterfly Valve

03/06/2017 1:29 PM

To open and close the flow of a fluid. That's why any valve is put in a system. A butterfly valve instead of another geometry may have been selected for any of a number of reasons. A few reasons are speed of operation, proportional control, desired turbulence, or just simply that was what was on the repair truck that fit the pipe dimensions. Then there are the unknowns of why put a valve there at all. You don't give us enough information to make a reasonable guess.

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#6

Re: Butterfly Valve

03/06/2017 3:20 PM

The usual reason is that the butterfly valve may be a control device, subject to wear from cavitation, vibration, and/or cycling. The shutoff valves on either side allow the butterfly valve to be isolated for adjustment or repair.

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#7
In reply to #6

Re: Butterfly Valve

03/06/2017 4:19 PM

along with that,... the footprint of a butterfly valve is smaller that say a ball valve.

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#8
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Re: Butterfly Valve

03/06/2017 4:35 PM

We could throw in cost, too. However, I think the main point was the presence of three valves, regardless of throttling valve type.

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#9
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Re: Butterfly Valve

03/06/2017 6:02 PM

Without a schematic of the process, I'm just guessing.

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#10
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Re: Butterfly Valve

03/06/2017 6:20 PM

We all are guessing.

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#11
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Re: Butterfly Valve

03/06/2017 6:26 PM

Maybe not all of us.

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#12
In reply to #11

Re: Butterfly Valve

03/06/2017 6:29 PM

Not one definitive post yet. With the exception of redfred.

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#13
In reply to #11

Re: Butterfly Valve

03/06/2017 9:12 PM

I'm curious to know who thought that to be off topic, and even more curious to know why. Good grief.

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#14
In reply to #13

Re: Butterfly Valve

03/07/2017 5:27 AM

Really?,... I did,... lighten up.

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#16

Re: Butterfly Valve

04/26/2017 3:56 AM

Your "vapour absorption machines" might be operating in "siphon effect" i.e. the operating pressure inside might actually be vacuum. In order to achieve vacuum inside the machine after the pump start-up, a certain procedure is required, for which the butterfly valve is suitable.

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