Back Pressure Valve vs Back Pressure Regulating Valve
Back Pressure Valve vs Back Pressure Regulating Valve
(OP)
This question is pertaining to water works.
I am seeing two terms or two equipment - back pressure valve and back pressure regulating valve.
Wondering what is the difeerence between these two (in terms of inlet and outlet pressure)
I am seeing two terms or two equipment - back pressure valve and back pressure regulating valve.
Wondering what is the difeerence between these two (in terms of inlet and outlet pressure)





RE: Back Pressure Valve vs Back Pressure Regulating Valve
My focus is on corrosion-resistant, high-alloy valves for the petrochemical industry.
RE: Back Pressure Valve vs Back Pressure Regulating Valve
a) Back pressure regulating valve:
A valve to control the back pressure. Normally from a higher upstream pressure to regulate down to a lower downstream pressure, adjusted to maintain the downstream lower pressure within a given limit at varying downstream consumption.
Upstream pressure might be at a higher pressure class or also at the same pressure class as the downstream pressure.
b) back pressure valve:
Have never seen this used, but might be an isolating valve. In this case I presume this to be further qualified with a more detailed description elsewhere in the project (as you have to do with a presure regulating valve). The description could (should?) in this case for instance give full qualities as for instance: qualified as end valve, eg valve 'droptight and secure' at full pressure according to pressure class upstream, and pipeline demounted or emptied (atmospher) downstream, and perhaps the same the other way.
The project must describe detailed verbally, with examples of typical/acceptable valves/brands/constructions, drawings or datasheets the exact meanings, giving full flow details under all conditions.
RE: Back Pressure Valve vs Back Pressure Regulating Valve
In my experience both a "back pressure valve" and a "back pressure regulating valve" do the same job--maintain upstream pressure at a set point regardless of downstream pressure. They both do it with a combination of springs, diaphragms, and internal or external pilots. They are the same thing from different manufacturers.
Valves that maintain downstream pressure (nearly) regardless of upstream pressure are called "pressure regulating valves" or "regulators". They often look very similar to a back pressure valve, but the primary sensing point is on the other side of the flow arrow.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
RE: Back Pressure Valve vs Back Pressure Regulating Valve
rmw
PS to David: I would encourage you to bring back one of your former signature tag line and add it to your present one as a fourth line - the one that said "Two anecdotes is not data."
RE: Back Pressure Valve vs Back Pressure Regulating Valve
...bow to you, gentlemen, and withdraw my attempt to give a definition...
RE: Back Pressure Valve vs Back Pressure Regulating Valve
It does fit doesn't it. Oh well, if you're going to be preachy, might as well do it whole hog.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: Back Pressure Valve vs Back Pressure Regulating Valve
I love it.
rmw