GB235130A - Valves - Google Patents

Abstract

235,130. Eggleston, L. W. June 9, 1924, [Convention date]. Actuating - mechanism; thermally - actuated valves.-A, valve device particularly applicable for use as a thermostat to control the supply of gas to a water heater has a valve member supported by a pivoted arm actuated by lever mechanism acting through a tumbler spring. The valve washer 35 is supported by a valve member 33 carried by a pin slidably mounted in the bent end of a slotted lever 24. Rotation of the valve is prevented by a tongue 37 engaging the slot. Intermediate its ends the lever 24 has projecting knife edge pivots 29 adapted to engage V notches in a frame 19 carried by a detachable cap 7. The cap is positioned by dowel pins 8 and secured by screws 9. A spring 62 is connected to the free end of the lever 24 and to the bent end 61 of a second lever 54 supported by cars 55 from a pin 20. The spring is arranged diagonally across the levers as shown in Fig. 4, so that a bearing surface 24a on the lever 24 is always pressed against the frame 19. The bent end of the second lever is adapted to pass through the slot in the first lever so that as the second moves within the limits allowed by the stop pin 24. The spring first acts on one side and then on the other of the pivots 29 so that the valve is opened or closed with a snap action. The second lever is connected bv a link to a third lever 52 provided with an adjustable fulcrum, and in the form shown adapted to be operated by a pointed plunger carried by a thermal capsule. The adjustable fulcrum comprises a cross pin 51 mounted in vertical slots 49 in the frame 19 and in inclined slots 50 in an adjustable member 41. The member 41 rests on flanges 39 on the frame 19 is guided by a pin 48 engaging a horizontal slot 47, and is moved to and fro by a screwed spindle 43 provided with an indicating and operating handle 44. In the form shown in Fig. 2, the thermal capsule comprises a metallic bellows 75 connected at one end to a ring 73 supported by an internal bead on an outer vessel 64<a> having a flange 69 adapted to be clamped against the end of a nipple 10 by a coupling nut 67 which is also screwed externally for attachment to the apparatus in which it is desired to maintain a constant temperature. A volume of kerosene or other mineral oil is sealed in the capsule. The lower part of the bellows is provided with an integral head 76 adapted to be spun over a bead 78 on an internal hollow plug 77. Resting on a shoulder 79 on this plug is a two-part sleeve 82 having at its upper end a spring-supported abutment 84 adapted to engage the lever 52. In a modification the casing 64a is enclosed in a second casing through which liquid circulates, or it is heated by conduction. A passage 87 leads to a pilot burner, and the main valve may be provided with a valve-controlled bye-pa.ss 97 to keep the main burners alight.