An adjustable gate or valve used to control the flow of water through a sluice.
Anything that controls or limits an outpouring of people, emotion etc.
A valve, tap or faucet which regulates the flow of liquid or gas through a pipe.
A main shutoff for water to a home from a municipal supply. Usually these valves exist in pairs, one outside the property boundary and one inside the property boundary.
To control the gas pressure in (an oil well) by keeping the well closed in and the gas confined except during set intervals when the oil is flowed or pumped.