burner in operation and with atomizing steam flowing through the discharge conduit 28 and fuel oil similarly flowing to the burner through the discharge conduit 40 the oil valve 78 also has an associated stem 94 which extends downwardly therefrom past a sealing or packing device 96 to a biasing spring 98 the biasing spring 98 urges the oil valve member to its second or full line position at 78 and is compressed when the actuator member 48 urges the oil valve member downwardly to its first or broken line position at 80 an associated recirculation seat 100 has a plurality of small openings 102 102 provided therein that is the stem 94 extends downwardly through a central bore in the seat 100 and the plurality of small valve openings 102 102 are arranged circumaxially in the valve seat 100 about the central bore and the stem 94 at a lower portion thereof the valve 78 has a flat disc like member 104 which cooperates with the valve openings 102 102 thus with the valve member at its lowermost position 80 disc 104 serves to close the openings 102 102 when the oil valve member is in its upper full line position 78 the openings 102 102 are open and in communication with the oil inlet chamber 88 thus.