gate valve to reduce downstream pressure
gate valve to reduce downstream pressure
(OP)
hi
i would use a gate valve to reduce downstream pressure i a system, you must consider upstream pressure is constant.
I can't use an orifice because i do not know the exact upstream pressure but only its range.
I have seen that the valve could be set at position 15-50% open and i am not sure that it can be set without difficults.
Who can suggest where finding intrinsic characteristic of a gate or can give me a comment?
tx
i would use a gate valve to reduce downstream pressure i a system, you must consider upstream pressure is constant.
I can't use an orifice because i do not know the exact upstream pressure but only its range.
I have seen that the valve could be set at position 15-50% open and i am not sure that it can be set without difficults.
Who can suggest where finding intrinsic characteristic of a gate or can give me a comment?
tx





RE: gate valve to reduce downstream pressure
Good luck,
Latexman
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RE: gate valve to reduce downstream pressure
valve size is 6"
it's a fire-fighing application so fluid velocity is high
RE: gate valve to reduce downstream pressure
Or do you want to simply reduce (by an arbitrary amount) the downstream pressure because your current upstream pressure is too high?
A fire-fighting system usually does NOT want any flow restriction.
Why not use a simple pressure-reg valve, if you cannot use a variable speed pump controller.
RE: gate valve to reduce downstream pressure
i have not upstream pressure and can't calculate it by pumps and net caracteristics, but i know that it is in a range of pressure that is too high for my system.
RE: gate valve to reduce downstream pressure
RE: gate valve to reduce downstream pressure
You can get wholly fluid powered control valves off the shelf, especially for water so I don't understand why you can't get one. They need no power or instruments, but work very well for what sounds like your duty.
If your system has items not rated for the pressure, especially a fire water system, then you have more trouble than just a gate valve.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way