Stove

Abstract

A stove has a fuel reservoir which communicates via fuel supply line with a burner. A stop valve in the fuel supply line controls fuel supply from the fuel reservoir to the burner. A normally-open emergency shut-off valve in the fuel supply line is operable to close the fuel supply line if the fuel pressure rises a preset amount above a normal operating pressure due to overheating of the fuel reservoir for example.

1 . A stove, including:
 a burner,   a fuel reservoir,   a fuel supply line communicating between the fuel reservoir and the burner,   a stop valve in the fuel supply line which is operable to control the supply of fuel from the fuel reservoir to the burner, and   a normally open emergency shut-off valve in the fuel supply line which is operable to close the fuel supply line,   wherein said emergency shut-off valve is operable to close the fuel supply line in response to the fuel pressure in the fuel supply line, when said fuel pressure reaches a preset excess fuel pressure above a preselected normal operating fuel pressure.   
     
     
         2 . The stove as claimed in  claim 1 , wherein the emergency shut-off valve includes:
 a valve housing having a through bore,   a complementary valve plunger slidably mounted in the bore,   said valve plunger being movable relative to the bore between an open position and a closed position,   said valve plunger cooperating with the bore such that, in the open position, a fuel passage through the bore is provided and in the closed position, fuel flow through the bore is prevented.   
     
     
         3 . The stove as claimed in  claim 2 , wherein:
 the bore has a bore fuel inlet communicating with the fuel reservoir,   the valve plunger has a fuel passage extending through the valve plunger with a valve plunger fuel inlet and terminating in a fuel outlet nozzle,   said valve plunger fuel inlet being provided at a side wall of the valve plunger which slidably engages the bore,   resilient seals being provided at each side of the valve plunger fuel inlet which are engagable between the valve plunger and the bore to prevent through passage of fuel between the bore and the valve plunger,   a fuel bypass recess in the bore which cooperates with the valve plunger to allow fuel to bypass the resilient seal located between the valve plunger fuel inlet and the bore fuel inlet when the valve plunger is in the open position.   
     
     
         4 . The stove as claimed in  claim 2 , wherein retaining means is provided for retaining the valve plunger in the open position, when the fuel pressure is below said preset excess fuel pressure. 
     
     
         5 . The stove as claimed in  claim 4 , wherein the retaining means comprises a resilient pressure ring mounted in a circumferential recess in the plunger and frictionally engaging with the bore. 
     
     
         6 . The stove as claimed in  claim 4 , wherein the retaining means projects outwardly of the plunger for engagement within an associated annular groove in the bore when the plunger is in the open position. 
     
     
         7 . The stove as claimed in  claim 4 , wherein the retaining means is a spring mounted in the valve housing and engaging and urging the valve plunger towards the open position. 
     
     
         8 . The stove as claimed in  claim 2 , wherein a fuel filter is mounted within the fuel passage in the valve plunger. 
     
     
         9 . The stove as claimed in  claim 2 , wherein a cap is mounted at an outer end of the through bore, said cap being engagable with the valve plunger when said valve plunger is at the outer end of the through bore to retain the valve plunger within the through bore, said cap having an opening therein in alignment with the fuel outlet nozzle to allow through-passage of fuel gas discharged from the nozzle in use. 
     
     
         10 . The stove as claimed in  claim 5 , wherein the valve plunger comprises an inner part and an outer part joined by a threaded connector, a lower end of the outer part forming a male threaded connector for engaging with a complementary female threaded socket formed at an upper end of the inner part, said recess for reception of the pressure ring being formed between said parts when they are engaged. 
     
     
         11 . The stove as claimed in  claim 2 , wherein the stop valve comprises a valve body mounted at a top of the canister, the valve housing of the emergency shut-off valve having an outer threaded portion in screw engagement with a complementary threaded bore in the valve body, a valve head at a lower end of the valve housing being engagable with an associated valve seat
 formed at an inner end of the bore at an outlet end of a fuel inlet opening communicating with the fuel reservoir.   
     
     
         12 . The stove as claimed in  claim 11 , wherein said bore is stepped having an enlarged threaded outer portion which receives the valve housing and a smaller diameter smooth bored inner portion, the fuel inlet opening being formed by a port at an inner end of said inner portion, a seal being mounted in an associated circumferential groove at a lower end of the valve housing sealingly engaging between the valve housing and a wall of the inner portion above the bore fuel inlet in a gas-tight manner to ensure fuel gas must pass through the bore fuel inlet.