Check Valve Direction at Bypass Line of Pump

6 comments

Rate

Anonymous Poster #1	Check Valve Direction at Bypass Line of Pump 10/02/2020 4:12 AM
	Dear all I noticed that on some of drawings; the check valve direction at bypass line of pump set is flowback. But some of the drawing showing as, the check valve direction at bypass line of pump set is toward as pump output direction. which one is correct? if both are correct, let me know the purpose of these different design. Best regards NT
	Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: check valve direction at bypass line of pump 10/02/2020 5:20 AM
	The version on the right is the more usual. I can imagine a scenario for which the left version might work, but I've never seen it. I have some questions about the right version also, which may take some discussion. It is late here, so I'll defer until after noon. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
	Reply

nt Associate Join Date: May 2014 Posts: 30	#2 In reply to #1 Re: check valve direction at bypass line of pump 10/02/2020 6:28 AM
	Thank you Tornado once time, I have seen one page at internet. this page showed as: check valve forward direction for use to the water when no pump running time (electrical outage). check valve backward direction for the overflow water more than require flowrate to flow back to the source. i want to confirm to my knowledge about this issue, so i have re-seek out this page at on internet. But, i haven't see this page again at internet. So i have suspected that this page is showing to wrong information and no longer posting at now. So i ask and discuss with CR4. Best regards NT
	Reply

Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9912 Good Answers: 1141	#5 In reply to #2 Re: check valve direction at bypass line of pump 10/03/2020 8:42 PM
	I agree, forward might be to bypass stopped pump. Another possibility for reverse bypass might be pressure regulator... https://www.equilibar.com/application/pressure-bypass-valves/
	Reply

SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#3 Re: Check Valve Direction at Bypass Line of Pump 10/02/2020 9:22 AM
	https://www.valmet.com/media/articles/up-and-running/reliability/FRFluidDwgs1/ __________________ All living things seek to control their own destiny....this is the purpose of life
	Reply

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#4 Re: Check Valve Direction at Bypass Line of Pump 10/02/2020 9:58 AM
	It depends upon the circumstances. it is not unknown for a booster pump to be installed in parallel with a forward-facing check valve so that the check valve closes when the pump turns on. it is not unknown for a check valve to be reverse-facing in parallel with a pump so that a minimum flow is maintained through it while it is running. If in doubt, discuss the matter with a local Process Engineer. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Reply Score 1 for Good Answer

Just an Engineer Guru Join Date: Feb 2008 Location: Australia Posts: 2181 Good Answers: 255	#6 Re: Check Valve Direction at Bypass Line of Pump 10/05/2020 7:45 AM
	Have seen and worked with "forward bypass" for in-line pumps between reservoirs. When receiving reservoir was lower than source, flow happened under gravity. when replenishment of receiving reservoir was insufficient, then the pumps engaged and provided higher flow. Typically pumps only ran a few hours per month instead of twice daily as was the case before bypass. Bypass valve however also had stop valve upstream and downstream to enable removal and service while the line still serviced the reservoirs. __________________ Just an Engineer from the land down under.
	Reply

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

Copy to Clipboard

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (66 right now) Show Members