| 摘要 |
The present invention provides a pumped helium circuit comprising a compressor ( 14 ) with a high pressure port ( 16 ) and a low pressure port ( 18 ) each connected to a supplied equipment ( 61,63,65,67 ) to respectively supply compressed helium to, and receive compressed helium from, the supplied equipment; a pressure relief valve ( 12 ) operable to link the high pressure port to the low pressure port in response to a predetermined pressure differential; a non-return valve ( 13 ) located between a low pressure side of the pressure relief valve and the supplied equipment; and means for preventing oil carry-over from the compressor to the supplied equipment.
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