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Water gauges for small boilers

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Tony Martyr23/12/2009 11:27:19
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226 forum posts
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Having faithfully followed the Martin Evans design for my boiler I find that the commercially available water gauge assemblies are all threaded 1/4x40tpi while his design has water gauge bushes threaded 1/4 x 32tpi.
Do members know if and where I can buy the 32tpi versions?
I know that I could make the units myself but I have decided that the two safety critical boiler fitting: safety valves and water gauge, were the items I would buy.
I would also like to know the operational advantages, if any, between the 3 cock gauges and the plain blow down type.
My escape from Christmas is blocked because the garage/workshop has been taken over by boxes of food and alcohol sufficient to feed and stupefy most of the parish - Happy New Year
Tony
Phil Ashman23/12/2009 12:46:10
33 forum posts
Polly Models/Bruce Engineering do a Plain type with blowdown valve in 1/4 x 32.
The catalogue doesn't say what the glass diameter is though, 4 or 5 mm.
 
But, a water guage is dead easy to make, and as long as the glass is of adequate diameter, and the passages through the fittings are big enough, it'll be as good as any commercial one.
 
Phil
 

Edited By Phil Ashman on 23/12/2009 12:48:20

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