Minerva group of institutions

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17/08/2016
09/11/2015

College & university

27/10/2015
Non-lubricated plug valves contain a polymeric body liner or a sleeve, which is installed in the body cavity. The tapere...
16/10/2015

Non-lubricated plug valves contain a polymeric body liner or a sleeve, which is installed in the body cavity. The tapered and polished plug acts like a wedge and presses the sleeve against the body. The nonmetallic sleeve reduces the friction between the plug and the body. Like for soft-seated ball valves, non-lubricated plug valves are limited by temperature and chemical compatibility of the non-metallic materials used. Non-lubricated plug valves are used instead of lubricated plug valves, where maintenance needs to be kept to a minimum. They can be used in special services (e.g. sulphur and hydrogen fluoride), since they do not have a body cavity in open communication with the flow when switching, where fouling liquids could be trapped or solidify, potentially jamming the valve. These valves are not torque seated.

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MIET
Mavelikara

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