Fixing a firevalve

[The Natural Philosopher]

I've got one of these

mounted in an inaccessible-ish location down the side of an aga.

Its pissing diesel out.

Its almost impossible to remove because its in-line with the actual pipework and there's no room to spread the pipes to insert a new one

I've taken out the guts and its two O-rings - one to stop the oil flow and another to stop the gland leaking.

Neither appeared damaged, but the gland is leaking.

Anyone had any success replacing the guts with the guts from a new one?

[Dave Liquorice]

The fire valve should be outside the building to prevent oil entering in the event of a fire. They have long capillary tubes to get the heat sensor into the vicinity of the oil burning device. I'm not familiar with Agas but I would assume there is somewhere for a fire valve phial to fit. With a boiler it would go inside the casing somewhere.

As it's such a PITA to access why don't you remove it and fit a new, capillary not fusible head, one outside where you can get at it?

Diesel? BWTH you don't want either diesel or kerosene in the house, far to pongy.

[harryagain]

This is what slip couplings are for.

[The Natural Philosopher]

Different fire valve

In fact I have 3 on that aga.

One capillary inside the frame. One fusible head near the float chamber and one external to the building with the sensor in the (stud) wall

generic word for 28 sec heating oil. They are all kerosenes and or diesels

[Dave Liquorice]

That last one, which is arguably the most important, won't do much until the place is "well alight". B-)

Sounds as if that installation was installed by "professionals", like the ones that installed our the oil boiler here for the previous owners, capillary fire valve inside, twin wall flue and terminal that are not designed for oil (the terminal is actually marked "gas only".

house,

Diesel is 35 sec ... and some (old) heating kit does run on 35 sec "diesel" rather than 28 sec "kerosene".

[The Natural Philosopher]

Well really the actual range of compounds in products described by both terms is as diverse as it is similar.

You can certainly run cars off heating oil. And boilers off car fuel if it wasn't so expensive.

[Grimly Curmudgeon]

They're shit and now outlawed, at least here.

[Grimly Curmudgeon]

Plenty of new stuff does, too. You just specify what you want. Basically, bump up the pump pressure and bigger nozzle - lots of farmhouses run on diesel heating.