Wiki page on Mono MS

[Julian]

Just had a bit of a result with the mono.  The leak turned out to be a piece of landscaping fabric from one of my filters getting stuck in the seal.  Pulled it all apart and the only issue appeared to be an O ring.

I found a suitable replacement, put it back together again and amazingly it's all working again ... that's the sort of repair I like.  Impressed with the seal, the lack of bellows is a great idea.

I took a few photos and put a wiki  page together.  Welcome comments and can anyone find the working temperature for a MS?  I've seen it somewhere and remember thinking it was quite high, but I can't remember where I saw it!  The manual mentions 50°C and washing at 80°C, but I'm sure I saw a more definite statement somewhere.

http://www.biopowered.co.uk/wiki/Pump_-_Mono_MS

[Rotary-Motion]

nice looking internals

[greasemonkey]

Excellent writeup. Reminded me that I have one in the shed with a use for it.

Just one little mistake. You put "Max. head   3.5 bar"

I guess you meant max pressure.

[Julian]

Thanks for that, I've changed the figure to metres.

[Tony]

That sprung ceramic seal arrangement is common on a lot of industrial pumps, it's nice to see a few photos of it on the site.

If I ever have to take my ML apart again I'll take photos of that too.  Very similar inside but different placement of the suction port.

[Julian]

The MM and ML are very different.  With the MS the stator is designed to wobble a lot, pivoting on the far end of the moulding, and the rotor is connected direct to the motor shaft.

On MM and ML the stator is more rigid and there is a fixable coupling between the rotor and motor shaft.

A similar page on the other pumps would be a great addition.

[therecklessengineer]

That sprung ceramic seal arrangement is common on a lot of industrial pumps, it's nice to see a few photos of it on the site.

It's called a mechanical seal. *ing expensive, and when you put it back together, ensure the mating faces are spotless or else it'll wear and start leaking.

The parts are matched to each other, so you can't swap the ceramic bits from one to another - they must be replaced in entirety.

If fitted correctly, they'll outlast a lip seal by an enormous margin.

[Julian]

That sprung ceramic seal arrangement is common on a lot of industrial pumps, it's nice to see a few photos of it on the site.

It's called a mechanical seal. *ing expensive, and when you put it back together, ensure the mating faces are spotless or else it'll wear and start leaking.

The parts are matched to each other, so you can't swap the ceramic bits from one to another - they must be replaced in entirety.

If fitted correctly, they'll outlast a lip seal by an enormous margin.

I mixed and matched parts on my Leo pump seal with no deleterious effect.

[Head Womble]

That sprung ceramic seal arrangement is common on a lot of industrial pumps, it's nice to see a few photos of it on the site.

It's called a mechanical seal. *ing expensive, and when you put it back together, ensure the mating faces are spotless or else it'll wear and start leaking.

The parts are matched to each other, so you can't swap the ceramic bits from one to another - they must be replaced in entirety.

If fitted correctly, they'll outlast a lip seal by an enormous margin.

I mixed and matched parts on my Leo pump seal with no deleterious effect.

I did the same on my 110lpm pump with no sign of any leaks yet.

[therecklessengineer]

Hmmm, thinking about it, it probably won't matter much on a biodiesel duty pump.

Certainly when they run continuously they start leaking after a few months.

[Julian]

I bow to your superior knowledge, but surely it's just a very flat surface running on another very flat surface.

How would there be any difference between each seal?

[therecklessengineer]

I bow to your superior knowledge, but surely it's just a very flat surface running on another very flat surface.

How would there be any difference between each seal?

Yes, I've been thinking about this.

I was always taught that you can't mix and match because they were manufactured as a pair and lapped in to each other. I suspect though (as with most things in my industry) it's a little outdated. Modern machining is easily capable of turning out sufficiently identical items to be able to mix and match.

I've only tried it once due to a lack of spares. It worked, but not for long - although this might have been due to other factors.

If it's working, great!

And my knowledge isn't always that superior. 

[Tony]

Any ideas on IDing this Mono rotor on eBay?

http://www.ebay.co.uk/itm/171040518924

From what I can see, the mono MM/ML rotors are definitely different to the MS, and this one is different again.

[Julian]

Any ideas on IDing this Mono rotor on eBay?

http://www.ebay.co.uk/itm/171040518924

From what I can see, the mono MM/ML rotors are definitely different to the MS, and this one is different again.

I saw that too. I think it's from a much larger pump ... what used to be called a 'D' type.  They occasionally come up on ebay.  The pump has flanged connections, the motors are not usually close coupled and are often 3 phase.

[Tony]

I know the kind you mean, often turn up at farm machinery auctions for big money.

As an aside, I found this on google patents, that describes their (Mono's) patent for the progressive cavity pump:

http://www.google.com/patents/EP0985826A1