| 摘要 |
<p>The actuation of a flow regulating valve at the intake side of a compressor and of a downstream blow-off valve is controlled by a pressure-operated controller so arranged that on increase of the post-compression pressure within a range below a threshold pressure opening the blow-off valve, the flow regulating valve reduces the flow of the medium to be compressed. The controller operates with a first duct connected to the discharge end of the compressor, with a second duct disposed at the secution side but downstream of the regulating valve, and with an intermediate duct connecting the first two. Flow constriction means at each end of the intermediate duct maintain the pressure at a level between the pre- and postcompression valve. The arrangement provides a more consistent regulating behaviour than the known controllers whose operation is governed by the instant value of the discharge pressure resulting in the tendancy to over-control the operation in response to short-term pressure fluctuations.</p> |
