What is
safety valve?

The safety valve is a safety device used to evacuate the necessary fluid flow from a pressurized container, installation or equipment, in such a way that it does not constantly exceed the maximum allowable pressure.

What is the function
of a safety valve?

The function of a safety valve is mainly to protect people and facilities. Safety valves must be installed in those installations and equipment in which the maximum pressure limit must be guaranteed. The pressure limit can be exceeded for different reasons, including overpressures, control failures, pressure peaks, temperature variation, etc.

What are the types
of safety valve?

Spring loaded direct acting valves

It is the most widespread system. With a spring mechanism we achieve that the overpressures of the system act directly in the valve closing system, releasing the pressure according to the characteristics of the actuation spring. It is a simple, reliable and generally inexpensive system.

Pilot valves

Indirect action system that makes the valve react to overpressures through a secondary bypass that detects pressure.
The reaction is slower and more progressive, so it is indicated for those systems with large water hammer.

At Zaes, as safety valves manufacturer, we manufacture a quality product thanks to our experience of more than 60 years

Correct handling and installation in a safety valve are key to avoid device malfunction

Clean the inlet and outlet connections to avoid impurities that could damage the closing system.
Avoid components that cause pressure drops (shut-off valves, pipe extensions, etc.) between the system / equipment and the safety valve
The diameter of the connection must be at least the same as the valve inlet.
Always install in a vertical position.
The discharge generates back pressures that must be taken into account when selecting the correct valve size and model.
Do not use gaskets that give off residue.
In steam lines, never install the valve below the level of the pipeline.
Consult the installation details according to the legislation in force at the final site.

Safety valve sizing

To carry out a correct dimensioning of a safety valve sizing it is essential to know the following data

Set pressure
Capacity or relief flow of the safety valve
Characteristics of the fluid to be relieved
International calculation standard to perform to use the formulas required in said formula (API, ASME, BS, EN / ISO, NB, GOST, etc,)

What is the difference between a safety
valve and a relief valve?

Despite having the same purpose, to avoid overpressure in systems with risk of overpressure, the difference between a safety valve and a relief valve is that the safety valve protects the equipment or system by expelling the fluid, after an overpressure, to the outside. of the system while a valve prioritizes conserving the flow of the installation by relieving inside and will only open to expel pressure and fluid out of the installation in case the pressure begins to increase progressively.