GB190921126A - Improvements in or connected with Valves for Controlling the Supply of Gas to Gas Burners. - Google Patents

Abstract

21,126. Blake, E. W. Sept. 15. Actuating valves.-Relates to a by-pass gas valve for use with a controller of the kind described in Specification 14,973/09, the chief object being to ensure that the valve shall not be affected by small variations in the gas pressure which occur in the mains. In the arrangement shown in Fig. 1, the valve consists of two cones i, i<1> attached to a spindle h, which is operated through a lost-motion device o by a bell b. The cones open and close ports g<1>, m<1>, which communicate respectively with the main burner and pilot jet. In the position shown, gas enters at r, and passes under the bell b and also through the tube l and passages l<1>, m<1>, k<1> to the pilot jet. Increase in gas pressure causes the bell and valves i, i<1> to rise, thus closing the way to the pilot jet and opening the port g<1> leading to the main burner. The lost-motion device o allows balls d, which weight the bell, to be removed before the valves are actuated. The bell can thus be maintained in the raised position by gas at a low pressure. In the modification shown in Fig. 2, gas enters at l, and passes through a port p', which leads into the space y beneath the bell, and so through passages s<1>, p', q<1> to the pilot jet. When the bell rises, the valve i<1> closes the passage s<1> and opens a passage p<6> leading through a tube q to the main burner. Fig. 3 shows a further modification, in which the double cone valve is carried by a diaphragm, and opens and closes passages v<1>, u<1> leading to the pilot and main burners respectively. The passages v<1>, u<1> are situated in cross-bars v, u carried by the casing.