Hand Pump Leather Washer

[Koala]

Hi all
Does anyone know where you can buy 1 1/2" (38mm) leather cup washer for a hand water pump??

Could likely find some leather and make one but must be getting lazy

Koala

[don]

Jun 6, 2016 18:15:27 GMT 10 Koala said:

Hi all
Does anyone know where you can buy 1 1/2" (38mm) leather cup washer for a hand water pump??

Could likely find some leather and make one but must be getting lazy

Koala

Hi I machined a brass sleeve & fitted an "o"ring  works a treat in our clipper(do not even have to pump several times after standing).Cheers Don.

[Franklin1]

Is that fella still at Braidwood that restores all the old lanterns and stuff? He'd be able to knock one up for you quick-smart, I reckon. Your biggest challenge would be to leave the shop with only the washer, - and not another 50 kero burners to add to your collection!

cheers,
Al.

[cobber]

Ken,

In the Restoration Parts Suppliers List under 'Pumps. Galley/ Water/Sink' there are links that might help.
In the Technical reference library there is a very informative thread about all sorts of pumps ( thanks mostly to Al Franklin1 )
See if they help.

Cobber.

[Roehm3108]

So glad you have nothing to do, cobber. Been meaning to find that reddo thread for ages!!!! Just too busy bludging!

[Koala]

Ok, thank you for the advice. I did a bit more scratching around on the net and found this very helpful Australian site with lots of information on pumps and pump cups/buckets. The company `Windmill Supplies' has an online store where you can order various sizes of cups/buckets. I have copied a bit of useful information below. Also very useful if you happen to have a windmill in your back yard
windmillsupplies.com.au/shop/shop/Windmill_Pump_Buckets


Pump (Buckets) Cups
The seals used in brass windmill pumps and differential compensators are called either Cups or Buckets. – They are therefore, either Pump Cups or Pump Buckets, or Diff Cups or Diff Buckets. They are available in Leather, Neoprene, or Nitrile. The Pump Cups are sometimes

Which type of Cup is the best?

A good pump and differential cup should;
Be on-size (exactly the same size as the pump (or differential) cylinder).
Be shaped to suit the pump Plunger (the Alderdice Pump has a scalloped seat on the Plunger Block and Spacer).
Be permeable (so water can penetrate through the material and therefore lubricate the sliding surface).
Have good friction characteristics.
Have a lubricant built in.
Expand for its own wear.

It is only leather that satisfies all these requirements. Neoprene (which are actually made from nitrile) and Nitrile Cups will last longer, but they tend to cause the windmill to operate under an increased load. The Cups last longer but the windmill doesn’t.

The Golden Rules of Pump Cups
1. Don’t over-tighten the Plunger
2. “Crack a Leather bucket” before fitting – this involves kneading the bucket to soften the leather. This will ensure that swelling in the Cup happens quickly and up the cylinder; rather than outwards to jamb the plunger.
3.Test the pump prior to assembling the Column. This test is done on the work bench, by lifting the plunger in the pump and from the top of the stroke – let it go. The plunger should slide down under its own weight. If it doesn’t the Cups are too tight. If it free falls the Cups are too loose. The plunger should slide down steadily.
4. Get the pump pumping as quickly as possible (this encourages the swelling of the Cups up along the cylinder rather than outwards.

Koala