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Safety Relief Valves 

Used in industries such as - Chemical Processing, Oil and Gas, Power Generation

  • To prevent a system over pressuring
  • Protect your equipment and personnel
  • To meet with Compliance with Regulations

The primary reason to use a safety relief valve is to prevent a pressurised vessel or system from over pressurising. It is there to protect life, property and the environment and is the last line of defence should other safety systems fail. As the last line of defence, the accuracy and quality of a safety relief valve is paramount in ensuring an overpressure situation is avoided.

We are proud partners and stockists of Valvulas Nacional (part of the Pekos Group) who have been designing and manufacturing safety relief valves since 1976 in accordance with the most recognised international standards. We have also achieved country-specific approvals which gives us capacity to support and supply a global market.

Well known within the solar industry for having high quality valves that can meet severe service requirements, Nacional Safety Valves are experienced in designing and manufacturing pressure industrial safety relief valves suitable for many industries, including oil and gas, petrochemical and industrial.

Nacional Valves logo

Size Range3/4” to 4”
Pressure ClassANSI 150#
ANSI 300#
MaterialsWCB body, St/St trim
TrimSt. Steel F316 and Exotic
ConstructionFull nozzle, conventional, flanged
DesignEN ISO 4126-1, ASME VIII DIV.1, API 526
Seat InsertsMetal to Metal / Viton
CertificationNACE, PED CE/CA, ATEX, Firesafe Certified, API Monogram
FeaturesPlain cap and Lever options available
Nacional Valves logo

Size RangeDN15 - DN40
Temperature Range-50° - +300°
Pressure Class0.5 - 16bar
MaterialsManufactured 316L as standard
EPDM/ FFKM membrane seals

Our UK and European stock range is available in semi and full nozzle design, from ½” to 12” and includes a variety of materials including carbon steel, stainless steel and exotic materials including Inconel, duplex, super duplex and monel to meet severe service requirements.

Pressure industrial safety relief valves are designed and manufactured in such a way that they do not required welding and therefore do not require additional NDT’s.

To complement our range of industrial safety relief valves, we also supply Jungmann hygienic safety relief valves which are manufactured in Germany and hold the FDA certification making them ideal for the food and drink industry as well as pharmaceutical, steam and chemical industries.

The pressure industrial safety relief valves are supplied in accordance with manufacturer standard I-09, a copy of which is available on request. We offer an in-house painting facility means we can provide valves in accordance with all paint systems to suit customer requirements.

Our manufacturing supply partners provide the following extensive documentation as standard:

  • Our manufacturing supply partners provide extensive documentation as standard including datasheets / sizing calculations in accordance with API 520, ISO 4126-1, ASME Section VIII & AD2000 Merkblatt
  • Full traceability for the complete valve can be provided on request. Our experienced project/documentation team can provide custom document packs to suit individual project requirements
  • Tightness and set pressure certificate in accordance with API 527
  • 3.1 material certificate: body, bonnet, nozzle (where applicable), disc

How Can An Overpressure Situation Occur?

API Standard 521 Part I details common causes that may result in a need for overpressure protection:

  • Closed outlets/blocked discharge
  • Overfilling
  • Thermal expansion
  • Chemical reaction
  • Exposure to external fire (fire case)
  • Cooling system failure

Each of the aforementioned overpressure scenarios could happen independently from one another or more than one could happen simultaneously. It is important that the user provides the worst-case scenario to the valve manufacturer to be considered for the sizing and selection of the safety relief valve, as it directly affects the mass or volume flow to be discharged.

Valve Sizing Considerations

When selecting a safety relief valve for your application, the need however is not to simply select a valve that can meet the required flow capacities, but to select the valve that is sized correctly for the application.

Valves that are oversized for the application could also face operational problems such as chattering; where the flow rate is unable to sustain an open position causing the disc to repeatedly open and close against the nozzle, potentially resulting in damage to the sealing surfaces and leading to valve failure.

Maintenance

There are no definitive rules in place as to how frequently a safety relief valve must be maintained. Whilst a manufacturer may provide guidance for their product commonly a visual inspection every six months with a set pressure check every twelve months – the application, site requirements, advice from insurers or findings of any previous inspections could affect the desired frequency.

What to look out for when performing a visual inspection:

  • Broken or missing lead seal/wirelock
  • Signs of corrosion
  • Valve leakage – audible or visual
  • Missing identification plate/tag

With rare exceptions, safety relief valves are designed to last, however a scheduled preventative maintenance plan could assist in increasing the reliability of your safety product, reduce life cycle costs and provide peace of mind.

What Is A Safety Relief Valve?

A safety relief valve, also known as a pressure relief valve or safety valve, is a crucial component used to protect equipment, systems, and processes from overpressure situations. Its primary function is to automatically release excess pressure when it exceeds a predetermined set point, preventing damage or failure. It is designed to open automatically when the pressure in the system it is protecting exceeds a predetermined level, releasing the excess pressure and preventing potential damage or catastrophic failure.

These valves are typically used in a variety of industrial applications, including oil and gas production, chemical manufacturing, power generation, and many others. They can be found in a wide range of equipment, such as pressure vessels, pipelines, and storage tanks.

Pressure safety relief valves are critical components of any system that involves the handling of pressurised fluids or gases. They play a vital role in ensuring the safe and reliable operation of industrial equipment, protecting both the equipment and the people who work with it.

A safety relief valve, also known as a pressure relief valve or safety valve, is a crucial component used to protect equipment, systems, and processes from overpressure situations. Its primary function is to automatically release excess pressure when it exceeds a predetermined set point, preventing damage or failure. It is designed to open automatically when the pressure in the system it is protecting exceeds a predetermined level, releasing the excess pressure and preventing potential damage or catastrophic failure.

These valves are typically used in a variety of industrial applications, including oil and gas production, chemical manufacturing, power generation, and many others. They can be found in a wide range of equipment, such as pressure vessels, pipelines, and storage tanks.

Pressure safety relief valves are critical components of any system that involves the handling of pressurised fluids or gases. They play a vital role in ensuring the safe and reliable operation of industrial equipment, protecting both the equipment and the people who work with it.

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