valve for impulse flow response/hammering - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 29, 2019, 10:54:53 pm
content: What kind of valve is best to generate a hammer ?Would a butterfly valve or a ball valve create a bigger impulse if its slammed open (to make a 'blaster').I would imagine the butter fly valve is aided by the pressure differential to open faster, like a flap. Is this correct? Can you orient it so it naturally wants to open but is locked by a external link on the handle? rather then making it work against the flow.Also, it is possible to make the butterfly shape so that it is further torqued by the fluid when it is released to want to open faster with some kind of drag elements?

author: thm_w
author_rank: Super Contributor
timestamp: August 29, 2019, 11:17:04 pm
content: A solenoid valve.

author: coppercone2
author_rank: Super Contributor
timestamp: August 29, 2019, 11:34:28 pm
content: it will beat out a conventional valve actuated by a solenoid or air? I thought it would be limited by the orifice size which is typically small in a solenoid valve (its like a plug valve).

author: thm_w
author_rank: Super Contributor
timestamp: August 29, 2019, 11:52:34 pm
content: Well you mentioned handle so I assumed hand operated valves.If you can get a solenoid actuated butterfly valve it would be better, but they are not as cheap and easy to acquire.

author: coppercone2
author_rank: Super Contributor
timestamp: August 30, 2019, 12:45:48 am
content: would a butter fly valve or ball valve work better, if you were to get either?I would mod it with a long stiff arm and a fast air cylinder so it really gets yanked hard. (I have a cylinder, and the manual valves have an acceptable price.. however I will not pay for a solenoid for this experiment).Like a EMC torture tester, for plumbing.I read that a burst disk is like the best, but I mean something home made without powder charges etc.Transient survivability of plumbing vs the traditional estimate based on static force (hydraulic ram to pressurize).I know the ball valve will offer higher flow when fully opened, but I mean putting this thing right up to something to blast it with as high of a flow and pressure wave as possible (like a square wave). Up to the thickness and turbulence caused by the disk, the flow opening occurs twice as fast correct?How accurate is it to estimate the integral of the void forming as the disk is rotated over time vs the ball valve 'moon' expanding? Do turbulence/edge flow effects have a significant restriction properties on the flow? I assume a good butterfly valve has a non-right angle edge to the disk? So its like flowing against a cylinder.Will it produce a better initial front?Can this be calculated by hand some what accurately if you negate the splashing the water has (if its water entering a empty space) and kind of model is as a cone that is growing in base?

author: MarkF
author_rank: Super Contributor
timestamp: August 30, 2019, 01:09:18 am
content: Are we doing some "pumpkin chunkin"?

author: coppercone2
author_rank: Super Contributor
timestamp: August 30, 2019, 01:12:01 am
content: Quote from: MarkF on August 30, 2019, 01:09:18 amI think unless the barrel is extremely short it would not matter. I want to see what happens to thin pipe works (i.e. 0.01 inch thick tubing) and how bracing/bracketing effects themhttps://st4.depositphotos.com/16549710/19979/i/1600/depositphotos_199796266-stock-photo-tree-supporter-bracing-protecting-trees.jpgI imagine long thin pipes would have the most effect. I think with a pumpkin or projectile, the valve would be fully open before the projectile moved a significant amount? (if its electronically actuated) (so this has the effect of shortening the 'effective barrel length where there is displacement without much acceleration?)I want to test things like poorly fastened couplings, beat on pumps, etc.