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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).
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.
Security valve, a type of automatic shut-off valve (ASV): used to stop the flow of natural gas upon sudden pressure changes. Increased pressure or decreased pressure closes the valve (without using any external power sources).
California also adopted stricter requirements for oil pipelines, including more frequent inspections and automatic shutoff valves to quickly halt oil flow in the event of a rupture.
A petcock is a small shut-off valve used to control the flow of liquid or gas.Historically, petcocks were threaded valves controlled by a butterfly handle; [citation needed] modern petcocks are typically ball valves.
An automatic PSD typically isolates the system by shutdown isolation valves, thus bringing it to a safe state before the process parameters, such as level, temperature or pressure, exit the system safe design envelope. Its inputs are critical process signals from the likes of pressure and temperature transmitters, which must be separate from ...
Sun valve designed by Gustaf Dalen, 1912, TM34299 - Tekniska museum - Stockholm. A sun valve (Swedish: solventil, "solar valve") is a flow control valve that automatically shuts off gas flow during daylight. It earned its inventor Gustaf Dalén the 1912 Nobel Prize in Physics. Subsequently other variants of sun valve were developed for ...
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