A bonnet acts as a cover on the valve body. It is commonly semi-permanently screwed into the valve body or bolted onto it. During manufacture of the valve, the internal parts are put into the body and then the bonnet is attached to hold everything together inside. To access internal parts of a valve, a user would take off the bonnet, usually for maintenance. Many valves do not have bonnets; for example, plug valves usually do not have bonnets. Many ball valves do not have bonnets since the valve body is put together in a different style, such as being screwed together at the middle of the valve body.
Read more about this topic: Valve, Components
Famous quotes containing the word bonnet:
“Your hose should be ungartered, your bonnet unbanded, your
sleeve unbuttoned, your shoe untied, and everything about
you demonstrating a careless desolation.”
—William Shakespeare (1564–1616)
“Had I represented twenty thousand voters in Michigan, that political editor would not have known nor cared whether I was the oldest or the youngest daughter of Methuselah, or whether my bonnet came from the Ark or from Worth’s.”
—Susan B. Anthony (1820–1906)