Safety valves
Safety valves
Safety valves are used to prevent overpressure in different types of systems. If the pressure in a system becomes too high, the valve automatically opens to release the liquid or gas, allowing the pressure to drop to a normal level. Safety valves operate automatically without any form of external control.
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How do safety valves work?
The safety valve is part of the safety equipment and reacts when an overpressure occurs in a system. The valve protects people, materials and the environment.
The valves are designed with a spring that keeps the valve closed. If the pressure in the system becomes too high, the spring will release. The valve will then open and release gas or liquid so that the pressure in the system can drop to a normal level again.
The force of the spring determines the function of each individual valve and is adjusted according to needs and preferences. The valves operate automatically without any form of external control.
Rules and regulations for safety valves
There are strict rules and regulations regarding the use and installation of safety valves. If the valves do not fulfil the applicable regulations, there is a risk that they will not do their job in an emergency.
An important part of the regulations deals with the sizing of these types of valves. The dimension for each application is calculated according to temperature, opening pressure and flow, among other factors. The valves must be large enough to allow the liquid or gas in the system to be discharged, and the discharge must also be faster than the build-up of the substance in the system.
There must not be a shut-off valve before a safety valve.
Checking safety valves
Safety valves need to be checked regularly because the valves are rarely used. The spring may have stopped working or the valve may have corroded and this may not be detected in time.
There should be a maintenance programme for the valves so that regular checks are carried out. How often a valve should be checked depends on the valve and the individual system. Typically, checks are carried out at intervals of 12, 18, 24 or 36 months.
Safety valves from Lyma
We at Lyma offer several safety valves for different applications. We can supply the valves with gas-tight bonnet or lightweight body.
In our range you will find valves for corrosive applications, valves with different opening pressures and in different sizes and valves with different connections according to DIN or ANSI. We have valves in PVC, PP, PVDF, PFA, stainless steel such as AISI316 and Alloy-C.
Contact us
Do you have questions about safety valves or do you want personalised service from us at Lyma? Contact us and we will help you further!