Reduce suction tube size

[Anthony5]

I have a venturi valve which is fed by a 5mm tube.

I want to reduce the amount of liquid that is sucked up, but want to keep the operating time the same.

Therefor I consider to reduce the size of the tube at the liquid tank side.

Can I do this or will this create problems for my Venturi valve?

[Crossy]

I'm no expert on the venturi effect, but IIRC the pressure differential is determined by the main fluid flow rate unless the secondary rate is significant.

In other words, no, choking the injector pipe won't affect the valve

I would insert a small adjustable valve (tap) into the injector line so you can control the volume of liquid sucked up.

[Anthony5]

I'm no expert on the venturi effect, but IIRC the pressure differential is determined by the main fluid flow rate unless the secondary rate is significant.

In other words, no, choking the injector pipe won't affect the valve

I would insert a small adjustable valve (tap) into the injector line so you can control the volume of liquid sucked up.

Thanks, that is what I had in mind, but I was afraid that it would give a problem because the outflow capacity is higher than the feed.

[ksamuiguy]

15 baht inline aquarium valve in the suction line. The output will remain the same.

OR throttle the output of the Venturi, but this will cause a lot of problems , so pinch the tube!

[Anthony5]

15 baht inline aquarium valve in the suction line. The output will remain the same.

OR throttle the output of the Venturi, but this will cause a lot of problems , so pinch the tube!

Mate, they're ripping you off at 15 Baht

But let me go a bit further.

The Venturi valve is on a water filter to regenerate the resin.

So the vacuum is created with pumping water through the valve that goes straight to the waste, with the expression on waste, and runs for about 1 hour

What would happen if I reduce the waste tube, so that less water goes through the valve?

[weegee]

15 baht inline aquarium valve in the suction line. The output will remain the same.

OR throttle the output of the Venturi, but this will cause a lot of problems , so pinch the tube!

Mate, they're ripping you off at 15 Baht

But let me go a bit further.

The Venturi valve is on a water filter to regenerate the resin.

So the vacuum is created with pumping water through the valve that goes straight to the waste, with the expression on waste, and runs for about 1 hour

What would happen if I reduce the waste tube, so that less water goes through the valve?

Do what crossy suggested...he is correct.

[Anthony5]

15 baht inline aquarium valve in the suction line. The output will remain the same.

OR throttle the output of the Venturi, but this will cause a lot of problems , so pinch the tube!

Mate, they're ripping you off at 15 Baht

But let me go a bit further.

The Venturi valve is on a water filter to regenerate the resin.

So the vacuum is created with pumping water through the valve that goes straight to the waste, with the expression on waste, and runs for about 1 hour

What would happen if I reduce the waste tube, so that less water goes through the valve?

Do what crossy suggested...he is correct.

I know, but my second question is not related to the original one, I only try to find out if it is possible to reduce the water that is drained away during the process.

[ksamuiguy]

Reducing the flow through a Venturi, also reduces the Vacuum (suction) produced.

Be careful reducing the flow at the venturi output as at some point the water will start backing up in the suction tube.

Reduce the time the filter is back washed, look at the backwash water when it is cleared up stop the back wash.

next time back wash for the same time as you did previously.

A gauge on the system would help, like a pool filter, take a reading when everything is clean and BW completed.

usually when the pressure increases by about 20 psig, time to back wash. (times and pressures are dependent on many factors, each system is different) .

[Anthony5]

Reducing the flow through a Venturi, also reduces the Vacuum (suction) produced.

Be careful reducing the flow at the venturi output as at some point the water will start backing up in the suction tube.

Reduce the time the filter is back washed, look at the backwash water when it is cleared up stop the back wash.

next time back wash for the same time as you did previously.

A gauge on the system would help, like a pool filter, take a reading when everything is clean and BW completed.

usually when the pressure increases by about 20 psig, time to back wash. (times and pressures are dependent on many factors, each system is different) .

My question was not to reduce the venturi outflow, but the outflow to the drain.

The regenerating cycle of my automatic regeneration valve is as follow.

Backwash - regeneration and slow rinse - brine refill - fast rinse

The point is that the resin should be soaked in the brine for between 30 and 60 minutes to properly regenerate.

There is however no option to stop the cycle for a certain time between the regenerate and brine refill.

The tank refill also happens at a 3 x faster pace as the suction.

So my solution is to slow down the suction by reducing the suction tube, so that I can set the regenerating time to an hour, but that also means that a lot of water is pumped to the drain for 1 hour.

So if I could reduce the drain, so that less water is pumped to the drain, without negative consequences that would be ideal

[ksamuiguy]

A basic venturi, suction is controlled by the flow through the venturi.

Ventures are designed to for a flow range, the flow dictates the suction.

Once the regeneration solution is in the tank, turn off the pump, after a while turn the pump back on and after rinse terminate the cycle.

The automatic systems use a lot of water, so we usually clean, backwash and regenerate manually.

regeneration we have found over the years is usually not needed but about the 4-5 th backwash.

Anything you do the venturi flow effects the suction!

[Anthony5]

A basic venturi, suction is controlled by the flow through the venturi.

Ventures are designed to for a flow range, the flow dictates the suction.

Once the regeneration solution is in the tank, turn off the pump, after a while turn the pump back on and after rinse terminate the cycle.

The automatic systems use a lot of water, so we usually clean, backwash and regenerate manually.

regeneration we have found over the years is usually not needed but about the 4-5 th backwash.

Anything you do the venturi flow effects the suction!

Regenerating is needed, otherwise your resin becomes useless.

I of course could switch off the pump, but then the purpose of an automatic valve that does the regeneration at night when I'm sleeping would be gone.

[ksamuiguy]

Than live with it, or unplug system and plug in once a week, when you want to regenerate.

Unless you have really bad water and are using a large volume of water daily regeneration is hardly ever needed on a daily or weekly basis.

[Anthony5]

Than live with it, or unplug system and plug in once a week, when you want to regenerate.

Unless you have really bad water and are using a large volume of water daily regeneration is hardly ever needed on a daily or weekly basis.

Who was talking about a weekly base? My system get auto regenerated every 75 days, or whetever setting I enter.

But that doesn't change the fact that on each regeneration probably 1000 liter of water is pumped straight down the drain.

My sincere apologies for posting a question on a forum to ask if there is a way around it without the incovenience to have to operate a automatic valve manually.

Edited June 27, 2015 by Anthony5