spoke to gav today to confirm or deny that the shurflo pumps we use should be upside down,ie the part were the water comes in and out should be at the bottom,he reckons yes would this be right,is it something the manufacturers recommend?
ps
not doubting gavs wisdom
Shurflo now recommend the motor is fitted motor up is that any water leak would tend to gravitate away from the electrical motor rather than through it. (Shurflo fitting manual - "The pump may be mounted in any position. However, if mounting the pump vertically the pump head should be in the down position so that in the unlikely event of a leak, fluid will not enter the motor.)
Its got nothing to do this - "yes mate he is right and the reason for this is to take the pressure of the bearings so the pump can rotate more freely hope that helps - james". What a load of rubbish.
Spruce
i think you need to look into that a bit more mate just in case you did not know there is bearings in the bottom of the pump so by having it upside down dose takes the pressure off allowing the pump to rotate more freely. i know this because i have worked with the pump both way for a very long time and can tell the difference. I was trying to help the guy out so i would not say it was a load of rubbish but if thats the only reply you have and you need a diagram then please ask james
I'm sure Shurflo know more about their product than you do and they don't give this as a reason. In the early days Williamson Pumps didn't advise on the correct way a pump should be installed. The inlet filter which had a female thread locked tight (with the filter bowl facing down) with the pump housing above the motor. Peter Fogwill installed all his Shurflo pumps in his pump boxes this way up.
It has only been in recent years that they (Shurflo) have advised a mounting direction. The new Shurflo filters have a wingnut to allow adjustment of the filter bowl to suit any mounting configuration.
Secondly, I've worked in the technical department of Bosch Power Tools for many years with 12v battery driven motors used in the Gold mines underground and I've never heard a motor designer ever advising what you have.
So again, the advise you have given is a load of rubbish.
I'm also going to add that all those who say that the pump must be situated in this way so that it can be nearer to the floor to stop air locks are also talking rubbish. Is see the reply that was also included in this thread stating this has been removed.
Shurflo pumps are "self priming to a vertical height of 12' " according to the manufacturers. So if anyone is having airlocks, this is due to a pipe connection that isn't seating properly allowing air to enter the suction side.
The pumps on my 650l tank are both mounted halfway up the side and the pump in my sons van is nearly mounted above his 500 litre tank and we have never had airlock problems like this.
Spruce