| 摘要 |
The invention relates to an air release valve (10) which has a valve chamber (12) having an inlet (22) that is connected in use to a liquid pipeline or container. There is a first outlet (26) for venting relatively large volumes of air from the pipeline or container during filling, and a second outlet (64) for venting relatively small volumes of air which accumulate in the chamber during pressurised operation. The first outlet is closed by a float arrangement when liquid rises in the chamber above a predetermined level. A conduit (54) extends to the second outlet from an entrance located in the chamber substantially below this predetermined level. The result is such that a volume of air can accumulate in the chamber to serve as a shock absorber for the pipeline or container before there is a sufficient accumulation to displace liquid from the chamber to a level beneath the entrance. At this stage venting of accumulated air can take place through the conduit and second outlet.
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