| 摘要 |
<p>According to the invention, a device is realised for operating the combustion air lock 100 of a two-stage fuel oil burner comprising a first hydraulic cylinder 2 whose piston is a second hydraulic cylinder 3 with pressurised oil feed different from that of the first hydraulic cylinder, the end of the stem 15 of the second hydraulic cylinder being connected to the air lock 100 by means of a connecting rod 33, said air lock becoming closed in absence of oil pressure in said first and second hydraulic cylinder, said air lock being in a first partially open position 100a when the cylinder is under pressure, in a second position 100b with opening greater than before when the second cylinder is again under pressure, the stem 15 of the second hydraulic cylinder 3 being taken back to its position of rest by the action of a spring 52. <IMAGE></p> |
