| 摘要 |
1,264,708. Valves. ROBERTSHAW CONTROLS CO. 25 June, 1969 [26 June, 1968], No. 32173/69. Heading F2V. In a gas burner control device a manuallyoperated rotary conical plug cock 60 controls the flow between an inlet 12 and a main outlet 13 and a pilot outlet 15. The cock has off, pilot and on positions and movement from the off to pilot position connects a pilot passage 32 communicating with the inlet 12 to a passage 38 which is connected to the pilot outlet 15 via a filter 40 and restrictions 42, 46. Pilot 16 may then be lit and a thermocouple 17 holds an electromagnetic safety valve 18 open in the inlet. Further movement of the cock to on-position connects the passage 68 to the inlet and flow to the main outlet 13 takes place via bore 66, chamber 22 and thermostatically-controlled valve 26. A pressure-regulator formed by a closure with a flexible lip 76 and operated by the pressure in chamber 22 acting on diaphragm 85 against adjustable spring loading 90 controls the flow from the lower end of the plug bore 66 to the main outlet. Movement of the plug to "on" position disconnects pilot passages 32, 38 and connects passages 28 and 38 so that the pilot pressure is also regulated. In the "on"-position passages 50 and 56 are connected by the plug recess 70 to by-pass the restriction 42. In a modification restriction 42 and a further filter may be placed in passage 32 and the passages 50, 56 and groove 70 dispensed with. |
