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Boiler testing pump - plans ?

Water Pump = 2 opposed valves in a tube ?

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BW22/08/2019 13:04:08
249 forum posts
40 photos


Pressure Test Pump (Vertical Boiler Fittings Thread)

Hand Pump Schematic ??

Is this pressure testing pump as simple as 2 balls ( or cones ? each sitting in a countersunk hole at either end of a tube, on the pull stroke the bottom valve opens allows water in, then on the push stroke the bottom valve is blown shut and top valve blown open allowing water to exit ?

Could I make one as simple as that or is there more to it ?

.... maybe a couple of springs to close the valves and an O ring or two on the cylinder to help seal it ? .... O rings in the valves to help seal them ?


JasonB22/08/2019 15:15:25
18321 forum posts
2024 photos
1 articles

That's the basic way they work, pressure you will attain will be based on seating of balls and seal of piston. usually better to seat the ball onto the edge of a reamed or D bit cut hole rather than cut a CSK

BW24/08/2019 08:21:32
249 forum posts
40 photos

Jason, Thanks for the tip about the countersunk vs a sharp edge on the hole.

Paul Lousick24/08/2019 08:48:10
1457 forum posts
555 photos

You will also need a pressure gauge. Not sure what your requirements are but for new boilers in Aust., we have to maintain 2 x the working pressure for a minimum of 20 minutes and 1.5 x WP for re-testing.

Slight leakage thru fittings is OK but not the boiler, as long as the pressure does not drop below the test pressure. (Keep pumping.)


Edited By Paul Lousick on 24/08/2019 08:49:40

IanT24/08/2019 10:04:51
1548 forum posts
144 photos


Mine was loosely based on a design that appeared in EIM ( I don't have the reference no. to hand but I'll scan the article for you if you'd like it - just PM me) - and uses O-rings to seal the valves. I just used off-cuts I had to hand, so the cost was minimal. It's all mounted in an old bread baking tin my wife was throwing out that got re-sprayed. The pump bore was just drilled to take the stainless piston with O-ring seal - no reaming - I didn't have the right size to hand if I recall correctly..I was worried if it wouldn't work or wear too fast - but it pumps just fine and for my testing use only get used very occasionally.

Photo was taken a few years back during construction but you will get the general idea I hope.



Test pump - 300914 005.jpg

Phil Whitley24/08/2019 11:17:35
1222 forum posts
146 photos

one of these should suffice, there are several different ones on the market less than £30, and some which are inexplicably expensive, but yer takes yer money etc etc!

Harry Wilkes24/08/2019 14:41:24
928 forum posts
61 photos
Posted by Phil Whitley on 24/08/2019 11:17:35:

one of these should suffice, there are several different ones on the market less than £30, and some which are inexplicably expensive, but yer takes yer money etc etc!

I use one of the above for my hydraulic tests no problems with it so unless one really wants to make his/hers own pump go for one


Martin Johnson 124/08/2019 16:38:16
129 forum posts
1 photos

Another vote for buy it finished. By the time you have bought the brass, stainless steel, silver solder, balls, fasteners, the tank etc. etc. you will save money by buying it finished. I have been using a bought one for a couple of years now and it is so much more convenient and works very well. You can also use it to top up pressurised central heating systems.


Former Member24/08/2019 17:33:50
1329 forum posts

[This posting has been removed]

IanT24/08/2019 22:40:48
1548 forum posts
144 photos

Well yes, it probably makes sense just to buy one - but it can be good fun to make things too …

Perhaps not the most elegant piece of engineering but then there are not too many others quite like it...... laugh



Test pump - 240819.jpg

Phil Whitley25/08/2019 17:14:16
1222 forum posts
146 photos

I like it IanT! It has much of the steampunk about it, I just hope you didn't borrow the bread tin/tank from the kitchen!!

Rockingdodge25/08/2019 18:06:44
218 forum posts
36 photos

I read some of the comments on that Manomano hand pump, guess you pays your money and takes your chance!

Seems to be built down to a price rather than built to a reasonable standard at a competative price,


IanT25/08/2019 20:44:05
1548 forum posts
144 photos

Or you can end up with a (priceless) "antique" Roger that your ancestors will cherish for generations to come and no doubt wonder what it was originally for (as they lovingly polish it on the mantlepiece ). My Grandson thinks it's for inflating lead balloons and I've no idea where he got that daft idea from.... devil

Phil - I'd like to tell you that the bread tin came for free (as my wife was throwing it out) but since she went and purchased a new one shortly afterwards - in fact it cost me the price of a new bread tin! Apparently nothing is ever truly destroyed in the Universe, it just reappears in a different form and this certainly seems to be true of bread tins.


PS Finally found the article - EIM May/June 2009. Will be sending it to interested parties shortly.

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