Safety valve

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For Safety Valve (US Sentencing Guidelines), see Safety Valve(USSG).

Oxygen Safety Valve

ND250-Safety Valves
A safety valve is a valve mechanism for the automatic release of a substance from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits. It is part of a bigger set named pressure safety valves (PSV) or pressure relief valves (PRV). The other parts of the set are named relief valves, safety relief valves, pilot-operated safety relief valves, low pressure safety valves, vacuum pressure safety valves.
Safety valves were first used on steam boilers during the industrial revolution. Early boilers without them were prone to accidental explosion.
Contents
1 Function and design
2 Technical terms
3 Legal and code requirements in industry
3.1 United States
3.2 European Union
4 Water heaters
5 Pressure cookers
6 See also
7 References
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Function and design

Proportional-Safety Valve
The earliest and simplest safety valve on the steam digester in 1679 used a weight to hold the pressure of the steam, (this design is still commonly used on pressure cookers); however, these were easily tampered with or accidentally released. On the Stockton and Darlington Railway, the safety valve tended to go off when the engine hit a bump in the track. A valve less sensitive to sudden accelerations used a spring to contain the steam pressure, but these (based on Salter spring balances) could still be screwed down to increase the pressure beyond design limits. This dangerous practice was sometimes used to marginally increase performance of a steam engine. In 1856 John Ramsbottom invented a tamper-proof spring safety valve which became universal on railways.
Safety valves also evolved to protect equipment such as pressure vessels (fired or not) and heat exchangers. Safety valve term should be limited to compressible fluid application (gas, vapor, steam).
The two general types of protection encountered in industry are thermal protection and flow protection.
For liquid-packed vessels, thermal relief valves are generally characterized by the relatively small size of the safety valve necessary to provide protection from excess pressure caused by thermal expansion. In this case a small valve is adequate because most liquids are nearly incompressible, and so a relatively small amount of fluid discharged through the relief valve will produce a substantial reduction in pressure.
Flow protection is characterized by safety valves that are considerably larger than those mounted in thermal protection. They are generally sized for use in situations where significant quantities of gas or high volumes of liquid must be quickly discharged in order to protect the integrity of the vessel or pipeline. This protection can alternatively be achieved by installing a High Integrity Pressure Protection System (HIPPS).
Technical terms

A steam locomotive boiler safety valve belonging to 60163 Tornado
In the petroleum refining, petrochemical and chemical manufacturing, natural gas processing and power generation industries, the term safety valve is associated with the terms pressure relief valve (PRV), pressure safety valve (PSV) and relief valve. The generic term is Pressure relief valve (PRV) or Pressure safety valve (PSV)
Relief valve (RV): automatic system that relief by static pressure on a liquid. It specifically open proportionally with pressure increasing.
Safety valve (SV): automatic system that relief by static pressure on a gas. It specifically open almost straight to full lift after a pop sound.
Safety relief valve (SRV): automatic system that relief by static pressure on both gas and liquid.
Pilot-operated safety relief valve (POSRV): automatic system that relief by remote command from a pilot on which the static pressure (from equipment to protect) is connected.
Low pressure safety valve (LPSV): automatic system that relief by static pressure on a gas. The pressure is small and near the atmospheric pressure.
Vacuum pressure safety valve (VPSV): automatic system that relief by static pressure on a gas. The pressure is small, negative and near the atmospheric pressure.
Low and vacuum pressure safety valve (LVPSV): automatic system that relief by static pressure on a gas. The pressure is small, negative or positive and near the atmospheric pressure.
RV, SV and SRV are spring operated (even said spring loaded). LPSV and VPSV are spring operated or weight loaded.
Legal and code requirements in industry
In most countries, industries are legally required to protect pressure vessels and other equipment by using relief valves. Also in most countries, equipment design codes such as those provided by the ASME, API and other organizations like ISO...(and so on)

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