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Safety valves

Safety valves
Safety valves

Safety valves

Safety valves are there to prevent accidents! The purpose of the safety valve is to protect people in the area and also to protect the installation against excessive pressures. Finally, they are to secure the entire process.

This makes it vital to make the right choices in the selection.
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652 Safety valves made of gunmetal, angle-type with threaded connections Goet
Product code: 1837
813 Safety valves made of brass, atmospheric discharge, with threaded connections Goetze
Product code: 1840
2400 Safety valve made of stainless steel, angle-type with threaded connections Goetze
Product code: 3188
451 Safety valves made of stainless steel, angle-type with threaded connections Goetze
Product code: 3194
642 Safety valves made of gunmetal, angle-type with threaded or flange connections Goetze
Product code: 3195
6420 Safety valves made of gunmetal, angle-type with threaded connections Goetze
Product code: 3197
861 Safety valves made of gunmetal, angle-type with threaded connections Goetz
Product code: 1843
851bHF Safety valves made of gunmetal, angle-type with threaded connections Goetze
Product code: 3202
810 Safety valves made of brass, atmospheric discharge, with threaded connections Goetze
Product code: 1838
2480 Safety valve made of gunmetal, angle-type with threaded connections Goetze
Product code: 3189
451bG Safety valves made of stainless steel, angle-type with threaded connections Goetze
Product code: 3213
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Safety valves

What is a Safety Valve?

Definition of a safety valve according to DIN EN ISO 4126-1

A safety valve is a valve that can automatically discharge a quantity of fluid without the assistance of any medium other than that of the fluid concerned, in order to prevent a predetermined safe pressure from being exceeded. It is designed to close again after reaching normal pressure and prevent further fluid flow after the normal pressure is restored. It is the last mechanical protection of your system!

 

If you want to release excess pressure during normal operation, you need a pressure relief/overflow valve and NOT a safety valve!

 

The opening characteristic of a safety valve (the last resort to prevent an explosion due to overpressure) looks as follows. Safety valves should ideally never actuate, only in case of an emergency. It is also recommended to replace the safety valve after it has actuated to continue guaranteeing safety.

Safety Valve Characteristic

  1. The set pressure is reached; the valve is still closed.
  2. The set pressure is exceeded; the cone is lifted.
  3. At 10% over the set pressure, the valve opens quickly and completely.
  4. Maximum opening is reached - the valve releases the total overpressure.
  5. The pressure is again lower than the set pressure - the valve slowly starts to close.
  6. At a pressure of 10% (gases) (20% for liquids) below the set pressure, the valve is closed again.

 

Fixed points for safety valves are: 1, 3, 4, and 6; there are no standards for the others. Point 1 is the specified set pressure of the safety valve.

 

The opening characteristic of a pressure relief valve, overflow valve, pressure-holding valve, pressure relief valve looks as follows. A pressure relief valve can, in principle, continuously release and is therefore often applied as an overflow on pumps to prevent the pump from pumping against a closed valve.

 

Pressure Relief Valve Characteristic

  1. The set pressure is reached; the pressure relief valve is still closed.
  2. The set pressure is exceeded; proportionally with the overpressure, the pressure relief valve opens.
  3. At the required overflow amount, the pressure relief valve adjusts itself.
  4. As the system pressure decreases, the pressure relief valve begins to close again.
  5. The system pressure becomes lower, and the pressure relief valve closes further.
  6. At a pressure slightly lower than the set pressure, the pressure relief valve is closed again.

Fixed points are: 1 and approximately 6

 

 

Other names for safety valves are:

  • Safety valve
  • Safety valve
  • Safety device
  • Spring-loaded safety
  • Spring-loaded safety valve

 

Safety valves primarily protect the people working on the installation! Furthermore, they protect the installation against excessive pressures and the associated hazards. And then, they protect the process. If safety valves are not properly sized, this can have serious consequences. Therefore, our safety specialists are happy to advise you on the right spring-loaded safety valve.

 

What do we want to know for the selection of your safety device?

Our specialists would like to know the application in which the safety should work. The medium, set pressure (and any backpressure), temperature, and the required venting capacity. Also, the desired material of the safety valve and whether you want certificates or markings.

 

Safety Specialist

Ebora is a specialist in the field of safety valves for liquids and gases, including cryogenic, hot water, air, and steam applications.

 

Spring-Loaded Safety Valves

Safety valves are generally spring-loaded safety valves and are colloquially referred to as spring-loaded safety valves. In spring-loaded safety valves, the spring provides the back pressure of the medium, which determines the set pressure of the safety valve.

 

Weight-Loaded Safety Valves

In weight-loaded safety valves, a weight provides the back pressure of the medium, which determines the set pressure of the safety valve. The danger here is that an operator can consciously or unconsciously use the weight as a coat rack, causing the pressure in the system to rise dangerously.

 

Where are Safety Valves Used?

Safety valves are used in steam systems, steam boilers, pressure vessels, etc. If the pressure can rise due to the failure of another fitting, a safety valve is necessary. For example, if you reduce the pressure of your steam to a lower pressure for the heat exchanger and the pressure reducing or control valve fails. In this case, the spring-loaded safety valve must ensure that the full capacity can be vented so that the pressure in the heat exchanger cannot rise.

 

Safety valves are necessary in any system where the pressure can rise above the safe limit of the system. However, it is one of the components that will work the least. A (steam) system must be designed so that safety valves do not actuate under normal conditions. It is also recommended to overhaul the safety valves after they have actuated to prevent (steam) leaks through the valve.

 

What to Consider During Installation?

It is important to place the safety valves as close as possible to the installation to prevent a pressure drop in the line to the safety valve during venting. Also, careful consideration should be given to the venting line of the safety valve. In this line system, it must be ensured that the pressure drop does not become too large to guarantee proper function and capacity. If the spring-loaded safety valve has no bellows, the pressure after the safety valve can shift the working point. Safety valves with a bellows are somewhat less sensitive to this.

What we have also seen in practice is a safety valve for compressed air with a threaded connection where the venting line pointed towards a wall. When venting, the force on the wall was so great that the safety valve unscrewed itself and left the building through the roof!

 

Safety Valves: Set Pressure

The set pressure (also called set pressure) is the pressure at which the safety valve begins to open and allows medium to pass through. For liquids, you may observe droplets at the venting, and for gases or vapors, this is usually audible.

 

Safety Valves: Design Pressure

The design pressure is the maximum pressure that may occur in your system or installation. Ensure that your set pressure is at least 10% below your design pressure.

 

Safety Valves: Closing Pressure

The closing pressure is the pressure at which the safety valve is completely closed again after actuation. This pressure depends on the medium and is approximately 10% lower than the set pressure for gases and about 20% for liquids.

 

Safety Valves: Back Pressure

The back pressure of a safety valve is the pressure on the outlet side of the valve. This can be caused by longer and/or upward-leading lines on the outlet side. These back pressures affect the set point and capacity of the safety valve. As discussed earlier, an internal bellows absorbs a portion of the back pressure.

 

Safety Valves: Operating Pressure

The operating pressure is the (system) pressure that may occur at most during normal operation, and it should always be well below the set pressure to prevent juttering.

 

Safety Valves: System Pressure

The system pressure is the pressure that currently prevails in the system.

 

Where are Safety Valves Used:

  • Chemical and petrochemical industry plants
  • Biogas plants
  • Industrial and large boiler installations
  • Production and processing of technical gases
  • Shipbuilding and equipment
  • Secondary areas of the food, beverage, pharmaceutical, and cosmetic industries

 

Get in touch!

+31(0)26 370 6830

Request an account!

info@ebora.nl

Get in touch!

info@ebora.nl

Request an account!

+31(0)26 370 6830

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