Venturi What is it ? What does it Do !

loves saltwater · 10/16/2006, 12:52 PM

I have seen this term in several post but I have no idea what it is or what it does ...Please help the unknowing !

jjakes24 · 10/16/2006, 12:59 PM

I think they are talking about the venturi intake. It hooks up to the intake of a powerhead. The venturi intake has an air line hooked to it to create microbubbles in the stream so you can use the pump on a protein skimmer. I think they cost like 2-3 bucks. I have one on my Maxijet 1200 running my skimmer. It works great.

Paintbug · 10/16/2006, 03:06 PM

a venturi is a device that puts air into a stream of water with out the use of an air pump(in aquarium language anyway

). they are usually tied into the system somewhere close to the output or input of a water pump. they are usually used for skimmer intakes like jjakes24 mentioned.

MCary · 10/16/2006, 03:17 PM

A venturi is a pipe with a restricted area. It uses what is called Bernoulli's Principle. It is the same principle that makes an airplane fly. Basically it states that as the speed of a moving fluid increases, the pressure within the fluid decreases. On an airplane wing the top of the wing is curved. This means the air going over the top has to catch up to the air going underneath. Because it has farther to travel, it speeds up. This causes a lower pressure above the wing which in turn causes lift. In a venturi the fluid going through the restricted space has to speed up because the same volume entering the pipe is going through the restriction. When the water speed up the opposite side of the venturi developes a lower pressure. Low pressure always trys to equalize itself by pulling in higher pressure from where ever it can get it. In this case it pulls in from the higher air pressure fed by a small tube on the output side of the venturi. So it sucks in air. Does that make sense?

Mike

sir_dudeguy · 10/16/2006, 03:19 PM

venturi (or venturi effect) is like when you get a straw, stick it in a glass of water, and get something that can blow really hard (like an air compressor and hose) and have it blow across the top of the straw. When air goes by the straw fast enough, it will make a pressure imbalance or something like that and force the water in the glass to come out the straw. Thats just an example of the venturi affect.

The venturies on our powerheads do the same basic thing, only they have it reversed...the water goes by the tube so fast that it forces air to come thru.

Unless i'm using it on a skimmer tho, i'd just yank that little tube off, because it would just cause a ton of salt creep.

10/16/2006, 12:52 PM	#1
loves saltwater Premium Member Join Date: Oct 2006 Location: Katy,Tx Posts: 945	Venturi What is it ? What does it Do ! I have seen this term in several post but I have no idea what it is or what it does ...Please help the unknowing !

10/16/2006, 03:06 PM	#3
Paintbug Registered Member Join Date: Mar 2005 Location: Stoneville, NC Posts: 6,169	a venturi is a device that puts air into a stream of water with out the use of an air pump(in aquarium language anyway ). they are usually tied into the system somewhere close to the output or input of a water pump. they are usually used for skimmer intakes like jjakes24 mentioned. __________________ Never ask a girl over to see your crabs!! <-Tony-> Current Tank Info: NONE currently

10/16/2006, 03:19 PM	#5
sir_dudeguy Registered Member Join Date: Mar 2006 Location: Portland, OR Posts: 10,841	venturi (or venturi effect) is like when you get a straw, stick it in a glass of water, and get something that can blow really hard (like an air compressor and hose) and have it blow across the top of the straw. When air goes by the straw fast enough, it will make a pressure imbalance or something like that and force the water in the glass to come out the straw. Thats just an example of the venturi affect. The venturies on our powerheads do the same basic thing, only they have it reversed...the water goes by the tube so fast that it forces air to come thru. Unless i'm using it on a skimmer tho, i'd just yank that little tube off, because it would just cause a ton of salt creep. __________________ TAKE...LUCK!!!

10/16/2006, 12:59 PM	#2
jjakes24 Registered Member Join Date: Feb 2005 Location: Philly, PA Posts: 347	I think they are talking about the venturi intake. It hooks up to the intake of a powerhead. The venturi intake has an air line hooked to it to create microbubbles in the stream so you can use the pump on a protein skimmer. I think they cost like 2-3 bucks. I have one on my Maxijet 1200 running my skimmer. It works great.

10/16/2006, 03:17 PM	#4
MCary Premium Member Join Date: Dec 2002 Location: Hardin, Montana Posts: 3,142	A venturi is a pipe with a restricted area. It uses what is called Bernoulli's Principle. It is the same principle that makes an airplane fly. Basically it states that as the speed of a moving fluid increases, the pressure within the fluid decreases. On an airplane wing the top of the wing is curved. This means the air going over the top has to catch up to the air going underneath. Because it has farther to travel, it speeds up. This causes a lower pressure above the wing which in turn causes lift. In a venturi the fluid going through the restricted space has to speed up because the same volume entering the pipe is going through the restriction. When the water speed up the opposite side of the venturi developes a lower pressure. Low pressure always trys to equalize itself by pulling in higher pressure from where ever it can get it. In this case it pulls in from the higher air pressure fed by a small tube on the output side of the venturi. So it sucks in air. Does that make sense? Mike