Using Two Pressure Reducing Valves In Series
Using Two Pressure Reducing Valves In Series
(OP)
Dear All ,
Due to the non availability of pressure reducing valves from 40 bar to 10 bar , I will install two valves in series the first 40-16 bar and the second 16-10 bar , Is there are any limits for the distance between both valves ?
The valves are of 2" size , to be connected to 2" steel line to take water from a 16" discharge line of booster pump that discharge water at 40 bar . the 2" steel water line is to feed the operation building at the booster station and other water hydrants
Due to the non availability of pressure reducing valves from 40 bar to 10 bar , I will install two valves in series the first 40-16 bar and the second 16-10 bar , Is there are any limits for the distance between both valves ?
The valves are of 2" size , to be connected to 2" steel line to take water from a 16" discharge line of booster pump that discharge water at 40 bar . the 2" steel water line is to feed the operation building at the booster station and other water hydrants





RE: Using Two Pressure Reducing Valves In Series
Check out Mitech, CCI, Copes Vulcan and Flowserve (Valtek) who all manufacture such a valve.
RE: Using Two Pressure Reducing Valves In Series
RE: Using Two Pressure Reducing Valves In Series
(1) to be using water continuously at greater than the leak rate,
(2) or, to have an additional positive isolation valve, or at least the soft-seat option since I infer that this is cool water
(3) or, a PRV downstream of the control valve.
RE: Using Two Pressure Reducing Valves In Series
http://www.cuservices.net
Best of luck!
RE: Using Two Pressure Reducing Valves In Series
This trick works pretty well on gas, but much less well on liquids. There is extremely narrow rangeability provided with the fixed restriction. It is optimized for one flowrate, but completely ineffective if the service conditions even change by 1/2. (DP~Flow^2)
When it's right, it keeps the upstream valve from cavitating. If the flow deviates, the upstream valve absorbs more of the pressure drop, cavitates,and the cav bubbles collapse on the fixed restriction until it disappers....
But we know that the customer ALWAYS gets the process conditions right the first time and they are always eager to admit that they gave the vendor bad information and that's why the equipemnt was destroyed....Right?
RE: Using Two Pressure Reducing Valves In Series
I am not aware that there is a required distance apart, but I usually try to at least have 20D between them, piping space allowing of course.
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