A steam trap comprises a casing having a condensate and steam inlet port and a condensate outlet port and an inverted bucket capable of rising and falling within the casing. A valve unit is interposed between the inlet port and the interior of the casing and is responsive to the height of the bucket...http://www.google.com.au/patents/US5065785?utm_source=gb-gplus-sharePatent US5065785 - Steam trap with separate steam and condensate inlets
