been playing

[Julian]

http://www.danfoss.com/North_America/Products/Categories/List/HE-HEC/Control-Valves-and-Temperature-Controllers/AVTB/b5b85908-fa32-45ff-80bf-34e08c5a3a04.html

[photoman290]

 thats the sort of thing i was thinking of. just have to keep an eye on ebay for a cheap one.

[Julian]

Wouldn't hold your breath ... I bet they don't come up that often, but good luck!

[photoman290]

been having a think about poosable failure modes and come up with a couple of options to make the burner idiot proof,or as near as i can anyway.

failure mode one:

 someone turns it up too high and the oil fills the pot faster than it is burning. i think one of these will sort that  possibility out. cuts off the oil supply by diverting it back to the tank. no oil, fire goes out.

http://www.ebay.co.uk/itm/KBB-Teddington-2-metre-90-degree-fire-valve-C90-2M-/141115539608?pt=UK_Home_Garden_Hearing_Cooling_Air&hash=item20db244098


failure mode 2.

something goes wrong on the timer board and the pump continues to pump oil into the burner. thermostat cuts power to  the pump. no oil, fire goes out.

http://www.ebay.co.uk/itm/TH11-LINCAT-FRYER-HIGH-LIMIT-THERMOSTAT-SPARE-PART-/140421388453?pt=UK_BOI_Restaurant_RL&hash=item20b1c458a5

not sure which one should trigger first? i think the oil feed, as the oil tank will be below the pump so no chance of oil flowing to the burner if the pump stops. if the electronics fail the pump could carry on pumping and overfilling the  burner.
don't think either of them are adjustable so will have to experiment on best position to place the capillaries.

of course this means the fire goes out and will have to be relit, but variable  valves are expensive and hard to find.  the original idea was to let the burner die down and then fire up again once it has cooled down. if someone turns it up too high and it trips they will have get cold waiting for it to cool down before relighting it. that will teach them not to turn it up to high next time .

[photoman290]

just won this thing on the bay. looks like i might be able to do something with it. looks heavy duty enough looking at that spring.

http://www.ebay.com/itm/GM-VINTAGE-TEMPERATURE-SAFETY-CONTROL-SWITCH-by-TEDDINGTON-APPLIANCE-CONTROLS-/221313582042?

range is a bit low but should be able to find somewhere  for the capillary. it has all the important bits to be able to control a valve.

[greasemonkey]

Well that was cheap enough, and probably far better quality than new stuff.

[photoman290]

yes anything diecast and painted in stove enamel is always a good sign. looks like it might be ex MOD from the label.

[Julian]

just won this ...

As no on else was daft enough to bid, surely the term should be "just bought this"?

... only a thought.

[photoman290]

just wasted 10 quid on yet another piece of possibly useless tat just because i liked the look of it.  had a girlfriend like that once, she cost a lot more that a tenner though. is that accurate enough for you?