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2. Shutdown valve - Wikipedia

   en.wikipedia.org/wiki/Shutdown_valve

   A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment.

3. Earthquake valve - Wikipedia

   en.wikipedia.org/wiki/Earthquake_Valve

   An earthquake valve (or seismic valve) is an automatic method to shut off the low pressure regulated gas supply to a structure during a major earthquake and/or if a pipe is broken. These are applicable both to utility-supplied natural gas and to gas from liquefied petroleum gas (LPG).

4. Curb box - Wikipedia

   en.wikipedia.org/wiki/Curb_box

   A curb box (also known as a valve box, buffalo box, b-box, or in British English stopcock chamber) is a vertical cast iron sleeve, accessible from the public way, housing the shut-off valve (curb cock or curb stop) for a property's water service line.

5. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes

6. Tap (valve) - Wikipedia

   en.wikipedia.org/wiki/Tap_(valve)

   Turning a valve knob or lever adjusts flow by varying the aperture of the control device in the valve assembly. The result when opened in any degree is a choked flow . Its rate is independent of the viscosity or temperature of the fluid or gas in the pipe, and depends only weakly on the supply pressure , so that flow rate is stable at a given ...

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