| 摘要 |
The invention relates to equipment for thermal stations. The device forming the subject of the invention is of the type comprising a body 1 and a dish 2 rigidly connected to the latter and having a duct 3 putting the inner enclosure of the valve device in communication with the cylinder of the turbine and closed by a discharge valve 4, and is characterised in that a bush 13 is arranged between the part of the guide sleeve 6 provided with sealing rings 7, 8 and the body 1, the said bush being rigidly assembled to the body 1 and being provided, on its surface oriented towards the guide sleeve 6, with a chemical nickel coating, and each sealing ring 7, 8 comprising an annular groove 14 in its surface oriented towards the bush 13 and radial channels 17 putting the enclosure formed between the annular groove 14 and the bush 13 in communication with the gap formed between the guide sleeve 6 and the inner surface of the sealing ring 7, 8. The invention finds its most advantageous application in steam distributors of relatively high pressure turbines (P = 1.317x10<7> Pa and over, t > 540 DEG C). <IMAGE>
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