Patent GB-423776-A (GB)
Abstract: 423,776. Fluid actuated valves. KROMSCHRODER AKT.-GES., G., Osnabr³ck, Germany. May 14, 1934, No. 14585. Convention date, May 13, 1933. [Class 135] Valves controlled by pilot or relay valves.-A valve arrangement for controlling gas burners comprises (1) a pressure regulator D, controlled by the regulated pressure and adapted to close either with abnormal rise or fall of inlet pressure, (2) a regulating valve R under the control of an auxiliary valve W actuated by room-heat &c., and (3) a thermally actuated safety cut-off F associated with the igniting flame and so connected to the pressureregulator that if the ignition flame is extinguished the regulator D closes by setting its valve-body on the pressure-deficiency seating. A manually-actuated control valve S operable to three positions corresponding to the off, igniting, and working conditions of the whole device may be provided. The regulator D and regulating valve R may be arranged in series in the main conduit, Fig. 1, or the arrangement may function as a relay to control the operation of a main pressure regulating valve H, Fig. 5. In the arrangement shown in Fig. 1, the pressure regulator D is actuated by a weighted diaphragm 6 and has a pair of opposed lift valve members 3, 7 adapted to co-operate with seats on opposite sides of a partition 4. The control space 12 above the diaphragm is supplied with gas, either from the main gas inlet, or, as shown, from the regulated pressure space 2 of the regulator through a restriction 11, and to permit the regulator to open is vented through a pipe 13 opened by a valve 15 actuated by a thermal disc 14 subject to the heat of an igniting flame 17, the fall of pressure in the regulator D, and thus the supply to the main burner G, being controlled by the throttle 40. The restriction 11 may be between the inlet space 1 and the chamber 12. When the manually-actuated control valve S is, as shown, in the position for normal working, a recess 19 therein couples the regulated pressure space 2 of the regulator D to the igniting burner, through pipes 18<a>, 18, and a recess 29 couples the regulating valve R to its thermally-actuated auxiliary valve W through pipes 28, 30. In the shut off position, both these connections are interrupted. In the igniting position, gas is supplied to the igniting burner from the main gas inlet through a pipe 10, port 20, recess 19 and pipe 18. In the modified safety cut-off shown in Fig. 1<c>, the valve 102 is closed during operation, and the pipe 13 is vented to atmosphere through the port 105, but if the flame 17 is blown out, the valve 102 opens and pressure from the pipe 18 enters the pipe 13 and closes the regulator D. The regulating valve R comprises a lift valve 25 coupled to a diaphragm provided centrally with apertures 26<a> .. 26d, the aperture 26d being closed when the diaphragm is in contact with an adjustable stop 27. In the event of the thermally-actuated valve W closing, pressure builds up above the diaphragm through apertures 26<a>, 26<c>, thus moving it downwards. As it moves away from the stop, the aperture 26<d> is opened, thus accelerating the closing movement of the valve. As the valve opens, the aperture 26b is closed, thus increasing the opening pressure and giving an accelerated opening. In a modified arrangement, Fig. 2, the diaphragm of the regulating valve R has an aperture adapted to co-operate with a fixed tapered or stepped needle 135. The pressure regulator D has the valve member 3 provided with a balancing diaphragm 9, the control space 35 between the balancing and actuating diaphragms 9, 7 being connected (1) with the thermal safety cut-off valve F through a passage 34 throttled at 37, 40. The space 35 is also connected (2) through a passage 36 throttled at 37<a> with a conduit 38 leading to the chamber 12 below the actuating diaphragm 7, and (3) through the manual control valve S and a pipe 10 to the inlet side of the pressure regulator valve 3 for igniting, or by a pipe 18<a> to the outlet side, as shown, for regulation during operation. Fig. 5 shows the pressure regulating and control valves D, S, R applied to the control of a main pressure regulating valve H, and shows the arrangement in the working condition. In the igniting position of the control valve S, gas passes to the igniting burner 47 through passages 41, 42, chamber 43, passages 44, 45 and pipe 46. When the igniting flame is lighted, the thermal disc 48 moves the valve 49 to interrupt the connection between the pipes 46, 52, which in the closed position equalize the pressures on the diaphragm 55 of the regulator D ; simultaneously, pipe 52 is opened to atmosphere, causing the lower face of the regulator D to close on the seat aperture. When the valve S is moved into the working position shown, the direct supply to the igniting burner is interrupted, but the regulator D is thus opened and continues the supply. Regulated gas now passes through passage 45, valve S, pipe 61, to the thermallyactuated valve W, and thence through pipe 62 to the chamber 63<a> below the diaphragm of the regulating valve R. From thence it passes through a throttle 64 to the chamber 65 above the main diaphragm 66 and through a passage 67 in the seat of the valve R, a ported valve spindle 68, and a space around the edge of a spring-controlled floating valve-disc 69 to an igniting flame 73. As the pressure beneath the diaphragm 63 builds up, it lifts, opens an annular passage 75 connected through a large passage 75<a> direct to the control valve S, and gives a rapid opening of the valve R. The pressure in the chamber 74 above the diaphragm 63 now rises and lifts the valve 69 to the closed position shown. As the gas can now escape only through the small opening 70<a>, pressure builds up in the space 74 and re-closes the valve R. Meanwhile the rush of pressure from passage 75<a> has passed through passage 67 into the space 65 above the main valve H to give a rapid opening thereof. Thereafter the degree of opening of the main valve is dependent on the opening of the regulator D. If the thermal valve W closes, the pressure in space 74 falls so that valve 69 drops and space 65 is vented. The main valve is thus closed, the regulator D remaining closed in its upper position. When valve W reopens, H also reopens. If the igniting flames are extinguished, valve 49 equalizes the pressures on the diaphragm 55 and closes the regulator D, thus closing valve R and the main valve. Reopening is then only possible by use of control valve S. A funnel 80 adjacent the main valve may be provided to give a further large igniting flame. In a modification, the valve 49 has a leakage orifice and the vent 51 is adjustable. In another modification, the chamber above the diaphragm 55 is supplied through a throttle in the valve member and is vented through an adjustably throttled conduit. In the form shown in Fig. 8, the main valve H is opened when pressure enters the space 81 between the diaphragms 66, 77, and the degree of opening is controlled by a space 87 above the diaphragm 66. The space 87 is supplied through a throttle 86 communicating with the regulated pressure, and is vented by an adjustable throttle 89. Pressure from the inlet E, applied through a passage 82, in the " off " position holds the regulating valve D on its lower seating. On raising this valve by the starting handle 93, gas pressure passes (1) to the further regulating valve R, and thence through a passage 92 to the space 81, and through a throttle 90 to atmosphere ; (2) through the opening 83 in the diaphragm 55 of the regulating valve D, and through passage 34 to the igniting valve F ; and (3) through a passage 18 to a starting jet which opens the valve F. The regulating valve R is controlled by the pressure in the space above the diaphragm 85 which is supplied through an orifice 95 in the diaphragm and vented through the thermal control valve W. The valve R may be quick-acting. If the valve W closes, the valve R closes and the space 81 is vented through a throttle 90, thus allowing the main valve 3 to close. If the igniting flame is extinguished, pressure accumulates below the diaphragm 55 and forces the regulating valve D against its upper seating, whereupon valves R and H close.