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排污阀 páiwūfá
auto.	foul valve
compr.	blowdown valve; blowoff valve
el.	blowout valve
hydroel.st.	blow-down valve
nautic., tech.	blow down valve; blow off valve
shipb.	wash water valve
sol.pow.	drain valve
tech.	block down valve; blow-off valve; dirt trap; drainage valve; sewage water valve
排污阀旋塞 páiwūfá
auto.	mud cock

排污阀: 18 phrases in 5 subjects

Aviation	5
Compressors	2
Nautical	4
Shipbuilding	1
Technology	6