Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: davids3511 on August 14, 2008, 09:32:09 pm
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I am not certain how to set my van up. Should the pump be pushing or pulling?
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pushing through a di
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pull,
that way the pressure wont build up in the di, and damage it inside, and also any bits of resin that sometime come out will get caught in the strainer before it goes through the pump
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Push,...
The DI should always be after the pump. They are made to take the pressure,.. mine have labels on the side saying they're rated to 250 PSI if I remember right.
This reduces strain on the pump and helps prevent airlocks.
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pull!
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pull!
He just explained why you should have it on push.
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pump sucks water from tank ,pushes through di ,then no chance of any resin getting in the pump.
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So we have 2 saying pull and 3 saying push!
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Start a poll David!!
Or as Alex G,.. He always knows the answer!
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Push...
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pull,
that way the pressure wont build up in the di, and damage it inside, and also any bits of resin that sometime come out will get caught in the strainer before it goes through the pump
Pulling would clog up your strainer quicker than necessary with loose resin seeping from the di and put a strain on your pump. If your strainer gets partially clogged it would also slow down the flow of water after your pump so you would have to turn your dial up on your varistream if you have one fitted which in turn would drain your battery quicker and your battery would need more charging to top up to the same amperage which in turn would shorten the life of your battery.
How do you manage with bits of dirt on the glass which gets in the bristles of your brush whilst you're cleaning the glass?
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how do you put 2 di vessels in with 2 pumps if the pumps were to push out ?
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how do you put 2 di vessels in with 2 pumps if the pumps were to push out ?
i am fitting a new system in one of my vans today 1000ltr with 2 pumps and 2 di's
will post some pics later
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Spoke to Varitech a little while ago. They said that the pump needs to push through the DI. Apparantly the pumps are positive displacement pumps and they don't mind a bit of pressure but do not like suction at all. Sucking through the DI will cause suction and that is not good for the pump.
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push, anybody thats says otherwise is wrong, Luke
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sound like the bloody hokey cokey. push pull push pull shake it all about. lol
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pull,
that way the pressure wont build up in the di, and damage it inside, and also any bits of resin that sometime come out will get caught in the strainer before it goes through the pump
Pulling would clog up your strainer quicker than necessary with loose resin seeping from the di and put a strain on your pump. If your strainer gets partially clogged it would also slow down the flow of water after your pump so you would have to turn your dial up on your varistream if you have one fitted which in turn would drain your battery quicker and your battery would need more charging to top up to the same amperage which in turn would shorten the life of your battery.
How do you manage with bits of dirt on the glass which gets in the bristles of your brush whilst you're cleaning the glass?
i thought that was exactly what the strainer was for, to catch debris before you fire it at the glass
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Spoke to Varitech a little while ago. They said that the pump needs to push through the DI. Apparantly the pumps are positive displacement pumps and they don't mind a bit of pressure but do not like suction at all. Sucking through the DI will cause suction and that is not good for the pump.
Bingo.
Alex Wingrove take notice. :)
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Push
If you pull you will be liable to air locks esecially if you run out of water occassionally.
It is easy to prime your system if you are pulling water just from the tank with a small hose rather than through a filter system.
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Mine is set by (by Varitech) to push through the DI.
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I would set it up to push through the DI vessel. I do know of several that pull it through though with no problems!
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Push - without a shadow of doubt.
These pumps are not designed to create a large negative pressure on the inlet; they are designed to create a reasonably large positive pressure on the outlet.
Davids3511 is 100% correct.
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I used to pull (ask the missus) but when i changed to push and pressured the di vessel it immediately showed up a leak that i couldn't find pulling so when the push comes to the shove i push.
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This thread sounds like the pullmepushyou from Dr Dolittle trying to give birth.
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I used to pull (ask the missus) but when i changed to push and pressured the di vessel it immediately showed up a leak that i couldn't find pulling so when the push comes to the shove i push.
That's exactly where I am at right now. My once seemingly watertight setup (pulling) is now sprinkling like a fountain (pushing).
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Pumps are not designed to pull but to push. However, as long as you are using a "run dry" pump you will have no problems. Most here are using such pumps. But if it cannot be run dry then you must use it to push.
You might be able to get a siphon action going which will allow you to pull but you will likely get airlocks at times and spluttering.
I have always recommended to push it through the resin.
I thought of setting up a low pressure high flow pump for this purpose. It would then provide a feed for two standard pumps. This way you can run two pumps from one series of filters.
Think I'll start a topic on that ;)
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I have 2 di's & have had them set up both ways, PUSH is the way to go. Although a system will work by pulling, you'll encounter far fewer problems pushing. ;)
Tony