Sigmar marine 40 litre boiler prv.

[jeanb]

The relief/non return valve on our Sigmar BO 40 used to discharge some water most days into the engine space bilge. Recently it has stopped functioning and despite wiggling it daily it appears seized. We have the manual and would like a new prv but our searches online have drawn a blank; there seems to be plenty available but none specific for our boiler. Which one should we use? Grateful thanks for any replies.

[GUMPY]

The sigmar one is listed at 6bar 

https://www.svb24.com/en/quick-safety-valve.html

Quite high, UK ones are normally 3bar I think.

Aquafax sell the unit  they may be able to help.

[Tony Brooks]

I think that is not a boiler, it seems to be a calorifier, whatever Sigma say.  I also note they claim theirs is the only calorifier that allows heating from more than one source. That must be news to hundreds of boaters with ordinary twin coil calorifiers.

[jeanb]

Many thanks for replies.

[Chewbacka]

I would not expect a prv rated at 4bar or higher to leak if feed by a (typically) 1 or 2 bar pump, unless you don’t have an expansion vessel, which you should have.

 

The tank is rated at a max pressure of 5bar, so 6 bar prv doesn’t seem wise.

https://media1.svb-media.de/media/snr/116091/pdf/manual_multi_2008-07-25.pdf