The Steamboating Forum

Have anybody used the Nabic 542 Safety Valve. I could use a new safety and buying online at http://www.nabicvalvesonline.co.uk/ priced at £113 plus VAT looks my best bet so far.

This is 3/4 bsp size. Before i order one any other valves or places I should be looking at , UK based.

Mike
The 542 is a standard lift valve, at 0.75 nominal size it can release 384/393 kg/hr at 150 P.S.I. I believe your boiler is fairly small. My personal choice would be to bush down to a 0.5 inch fig.500 series valve, this is a high lift version although they look identical. This has a capacity of 546/559 kg/hr. at 150 P.S.I. The high lift ones do go off with a bit of a surprise which some of our older members frown upon. Either is suitable. But I would advise running this past your boiler inspector first.

An alternative is the Bailey Burkett 707 series. I would contact Johnson Valves of Southampton, address in SBA suppliers list.
Regards Jack

Hi Mike

Go with Jack's advice as you will not get better. However, you might like to check Yellow Pages/Google for a local branch of BSS. They stock or will get safety valves and, being reasonably local, can be visited and questioned which is better than buying on-line. They also stock or can get a range of other steam related stuff. I suspect the downside is that they may not be the cheapest source.

Regards

Pete

I've had a safety valve that was oversized and it was not a great idea. The effects of dumping that much steam at a time are worth thinking about.

Wasn't there a discussion regarding that a few years ago?