Patent GB-412458-A (GB)
Title: Improvements in means for controlling the flow of gas to pilot light and other gas burners
IPC: F23Q9/00
Filed: 1933-10-03
Abstract: 412,458. Regulating flow of gases. HUMPHREYS & GLASGOW, Ltd., Humglas House, Carlisle Place, Victoria Street, London. Oct. 3, 1933, Nos. 27210, 27211, 27212, 27213, 27214, 27215, 27216, 27217, 27218, 27219, and 27220. Convention dates, April 24 and July 24. [Class 135.] Means for controlling a flow of the order of 0À2 to 0À5 cu. ft. per hour of gas to a pilot or other burner consists of a very long capillary tube of greater diameter than the gummy particles present in household gas, to prevent the clogging which would occur at a needle valve. As shown in Fig. 1, the capillary 5 is coiled on a tube 1 and byepasses gas round the partition 4. In a modification, Fig. 3 (not shown), the capillary tube 5 is inside the tube 1, the end 7 of the capillary passes through the partition, and the end 6 is open to the inlet 2. Adjustment may be made by pulling the tube 5 out of the tube 1 and cutting off a piece of the former. An igniting flame may be obtained by opening a push-button valve 27, Fig. 4, thus admitting gas through passage 31 and the tube 1 to the pilot burner. The capillary 5 is connected through the groove 43 in the nut 37 and passage 32 to the inlet. An igniting device of this kind may be combined with some of the other forms of capillary to be mentioned. The capillary may be formed between a screw and a tube, as shown for example in Fig. 8, and the tops of the threads of the screw 50 may be milled off slightly to engage shallow grooves on the nipple 1. The effective length of the capillary may be varied by screwing the screw 50 past the end of the inlet 51. The capillary may be formed by a sinuous groove, Fig. 10 (not shown), in a plate covered by a smooth plate carrying inlet and outlet connections. A disc 70, Fig. 18, having a spiral groove 71, 72 on each side also may be used. The two grooves are connected by a bore 73 and the plate is held in a casing 116 carrying the outlet nipple 80 by a smooth plate 74, carrying the inlet nipple 78. Several discs may be used in series separated by a perforated washer or washers. The inner turns of the upper spiral 72 may be progressively byepassed by uncovering holes 121 in the casing 116 by unscrewing a screw 120. In Fig. 19 (not shown) a corrugated disc perforated at its edge is clamped in the casing. In Fig. 31 (not shown) this disc may be pulled at its centre from its seating by a lever connected to a push button so as to give an igniting flame. When a number of spirallygrooved discs 190, 198, Fig. 28, are employed, a diso 210 having annular grooves 212 and a radial groove 213 may be assembled with them in different ways to give different effective lengths of spiral groove. As shown, both grooves of the upper disc are byepassed. The capillary may be formed by a sinuous groove on the body of a plug-cock, Fig. 30 (not shown), one end of the groove entering an annular groove on the plug which registers with the outlet in all positions, while the inlet passage registers with different loops. The diameter of the capillary may be varied by varying the depth of engagement of the spirally grooved member 273 within the member 271, Fig. 32, by turning the nut 287. The spring 283 holds the member 273 and acts as a seal. In another form a passage of variable area may be obtained by pressing a spiral spring between two sheets of rubber or lead. A capillary passage 315, Fig. 34, may be formed between two screw-threaded members 310, 312, the passage being reduced in size by turning the inner member without longitudinal movement. In the form shown in Fig. 44, the capillary passage 424 is formed between a scroll 421 and the sleeve 423. Each turn of the passage communicates through a hole such as 440, 445 with a slot such as 426 on the outer surface of the sleeve 423. Part of the passage may be bypassed by a rotatable valve 462 comprising an arcuate slot 465 registering with any of the slots 426 &c., a radial slot 464, and an annular slot 463 connected through a passage 461 with the outlet. Various other similar arrangements of threaded members and slotted and perforated tubes are described. Specification 3641 /10, [Class 135], is referred to.