Oil Spill Shut Off Valve

oil spill
An accidental or intentional discharge of oil which reaches bodies of water. Can be controlled by chemical dispersion, combustion, mechanical containment, and/or adsorption.
An oil spill is a release of a liquid petroleum hydrocarbon into the environment due to human activity, and is a form of pollution. The term often refers to marine oil spills, where oil is released into the ocean or coastal waters.
(Oil Spills) May be old or recent. Sometimes, the spilled oil comes from an "accident" but can also be a chronic problem along the oil pipelines that feed the electricity grid, in refuelling areas at airports or in a neighbourhood where residents refuse to properly dispose of their used motor

shut off
block off the passage through; "We shut off the valve"
isolate or separate; "She was shut off from the friends"
A device used for stopping a supply or operation
The cessation of flow, supply, or activity
stem the flow of; "shut off the gas when you leave for a vacation"

valve
A membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
A device for controlling the passage of fluid through a pipe or duct, esp. an automatic device allowing movement in one direction only
control consisting of a mechanical device for controlling the flow of a fluid
A cylindrical mechanism in a brass instrument that, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone