Valves are a component in a piping system that is used to control the flow of the media through the system which can be achieved by the manipulation of a few types of obstructors within the valve.
Butterfly Valves are used for isolating and regulating flow. The closing mechanism is a disc that allows for quick shut off, much like a ball valve. Butterfly valves are light in weight so they require less support. Unlike the ball valve, the disc is always present within the flow, therefore a pressure drop is always induced during flow, regardless of valve position. The disc is typically rotated a quarter turn when the valve is fully opened, but the valve may also be opened incrementally in order to throttle flow.
Lug-style butterfly valves usually comprise a metal such as ductile iron or steel. They feature threaded tapped lugs positioned on the valve flanges for bolt connections.
English 
Afrikaans 
Albanian 
Amharic 
Arabic 
Armenian 
Azerbaijani 
Basque 
Belarusian 
Bengali 
Bosnian 
Bulgarian 
Catalan 
Cebuano 
Corsican 
Croatian 
Czech 
Danish 
Dutch 
Esperanto 
Estonian 
Finnish 
French 
Frisian 
Galician 
Georgian 
German 
Greek 
Gujarati 
Haitian Creole 
Hausa 
Hawaiian 
Hebrew 
Hindi 
Miao 
Hungarian 
Icelandic 
Igbo 
Indonesian 
Irish 
Italian 
Japanese 
Javanese 
Kannada 
Kazakh 
Khmer 
Rwandese 
Korean 
Kurdish 
Kyrgyz 
Lao 
Latin 
Latvian 
Lithuanian 
Luxembourgish 
Macedonian 
Malgashi 
Malay 
Malayalam 
Maltese 
Maori 
Marathi 
Mongolian 
Myanmar 
Nepali 
Norwegian 
Norwegian 
Occitan 
Pashto 
Persian 
Polish 
Portuguese 
Punjabi 
Romanian 
Russian 
Samoan 
Scottish Gaelic 
Serbian 
Sesotho 
Shona 
Sindhi 
Sinhala 
Slovak 
Slovenian 
Somali 
Spanish 
Sundanese 
Swahili 
Swedish 
Tagalog 
Tajik 
Tamil 
Tatar 
Telugu 
Thai 
Turkish 
Turkmen 
Ukrainian 
Urdu 
Uighur 
Uzbek 
Vietnamese 
Welsh 
Bantu 
Yiddish 
Yoruba 
Zulu