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april 2011

How safety valves work

All devices contain a safety system made up of valves which have the purpose of keeping the fluid pressure within acceptable values.

Every system is equipped with safety valves. This is because, while in use, the sudden evacuation of a certain amount of fluid may be required, to avoid the prompt increase of pressure inside the pipeline.
For incompressible flows, “Bernoulli’s principle” determines the use of safety valves. The energy of a flow in a pipeline is made up of an amount of kinetic energy, pressure and amount of elevation. This trinomial must remain constant along the whole pipe section: to simplify by leaving out the elevation element, as the pressure element varies, the kinetic element also varies in order to balance it.
It is logical that as the kinetic element, which represents the flow velocity, approaches the values near zero, the pressure element increases its value to make this trinomial constant. Since the flow velocity is linked to the flow rate in the pipeline, the safety valves have the specific purpose of preventing the flow velocity from dropping below a certain value which could lead to an unexpected increase of pressure.
Safety valves are normally fitted with a mechanical spring device that automatically activates in the event that the pressure in the pipeline drastically increases. Attached to the spring is a piston that allows the excess water flow to exit under the elastic operation of the spring.


See also
20/02/2014 General description of the mini control units Mini control units manage the pressure input / output from the collector, allowing nominal operation of the device

20/02/2013 The features of shutoff valves The shutoff valve is one of the elements which make up the safety devices of systems containing both gaseous and liquid fluids in motion.

20/03/2019 The use of pressure regulators in oxyacetylene welding

20/04/2015 The correct choice of a pressure reducer for water Two useful graphics for the choice of the right pressure reducer for water in respect of a domestic installation

20/02/2018 Water pressure reducer "mignon" series For installation in narrow spaces we use a water pressure reducer of the "mignon" series

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