I. Importance of safety valves: guarding the key barriers of industrial safety

In industrial production, overpressurization of a system can lead to a number of serious consequences, including mechanical damage to equipment and surroundings, loss of product and productivity, damage to the environment, and even a threat to life and limb. Overpressurization can be caused by unintentional closure or opening of shut-off valves during the process, failure of machine components, failure of cooling systems, pneumatic or electric failure of control instruments, transient pressure pulsations, abnormal heating of the process, changes in ambient temperatures, sudden disconnection of the power source, or the occurrence of a fire, among other things.

In order to comply with local health and safety regulations and to safeguard equipment and processes, safety valves must be installed in places where dangerous overpressurization may occur. Spirax Sarco safety valves, as professional overpressure protection equipment, are widely used in all kinds of industrial processes, whether it is a large chemical plant or a commercial fluid transfer system, to provide reliable overpressure protection, create a safe working environment, guarantee continuous and efficient production, and protect the profits of enterprises.

Second, the core points of the safety valve selection: accurate matching needs

Correct selection is to ensure that the safety valve to play an effective protective role in the premise, mainly to determine the following key parameters:

  1. maximum displacement: The displacement of the safety valve needs to be large enough to ensure that the system is not overpressurized when it is actuated, usually with reference to the flow rate at full boiler load or the maximum flow rate of the valve.
  2. set pressure: The set pressure needs to be a balance between safety and the needs of normal system operation. On the one hand, it must be low enough to ensure that the maximum permissible build-up pressure in the boiler vessel/system does not exceed the permissible value; on the other hand, it must be high enough to ensure that the valve closes with a sufficient margin above the normal system operating pressure and not above the maximum operating pressure of the system. If the safety valve is to be used downstream of the pressure reducing valve, it is particularly important to determine the pressure when there is no load downstream, which is particularly important for direct acting pressure reducing valves.

Once the type, displacement, and set pressure of the safety valve have been determined, subsequent selection can be made. For steam, compressed air and water, the selection can be based on the given displacement table, to ensure that the selected safety valve in the overpressure displacement slightly greater than the required displacement; if the displacement table can not meet the demand, or safety valves used for other fluids, it is necessary to calculate the minimum throat diameter to determine. In addition, hot water safety valve selection should be noted that due to the presence of flash steam at the time of discharge may generate back pressure, the given displacement table is not applicable.

Spirax Sarco offers the right safety valve or safety relief valve for most pressure relief applications, with comprehensive sales and technical support brochures, extensive selection charts for common fluids, as well as fast and accurate selection through selection software that generates data specification sheets to provide professional assistance in selection.

Third, Spirax Sarco safety valve series: multi-scenario precise adaptation

(i) Steam and integrated applications series

  1. SV604 Full Stroke Flange Connection Safety Valve
    • Caliber: DN20~DN150
    • Setting pressure range: 0.5~40bar
    • Valve body material: cast steel
    • Standards: AD Merkblatt A2, TRD 421 and TRD 721
    • Certification: TOY-TS
    • Applications: Protects steam boilers, piping, pressure vessels, compressors and gas storage tanks for routine industrial applications.
  2. SV607 Full Stroke Flange Connection Safety Valve
    • Caliber: DN20~DN150
    • Setting pressure range: 0.5~40bar
    • Valve body material: ductile cast iron
    • Standards: AD Merkblatt A2, TRD 421 and TRD 721
    • Certification: TOY-TS
    • Applications: Protects steam boilers, piping, pressure vessels, compressors and gas storage tanks for routine industrial applications.
  3. SV615 Full Stroke, Full Nozzle DIN Safety Valve
    • Caliber: DN15-DN50
    • Setting pressure range: 0.3-18 bar
    • Valve body material: bronze
    • Standard: BS 6759 parts 1,2,3
    • Certification: SAFed-ST
    • Applications: Protection of pressure vessels subject to fire or non-fire, including steam generators, piping, compressors, storage tanks, downstream of pressure-reducing valves, and other conventional industrial applications.
  4. SVL606 Full Stroke Stainless Steel Safety Valve
    • Caliber: DN25~DN150
    • Setting pressure range: 0.5~36bar
    • Valve body material: stainless steel
    • Standard: AD Merkblatt A2 and TRD 421
    • Certification: TUV
    • Applications: Protection of steam boilers, piping, pressure vessels for steam and inert gas applications, as well as air compressors and storage tanks for use in the food, pharmaceutical and chemical industries.

(ii) Clean System Application Series

SVL488 Full Stroke Clean System Safety Valve

  • Caliber: DN25~DN100
  • Setting pressure range: 0.5~14.6bar
  • Valve body material: stainless steel
  • Standard: AD Merkblatt A2, TRD 421
  • Certification: TUV
  • Applications: Suitable for clean systems to protect steam boilers, piping, pressure vessels for steam or inert gas applications, as well as applications such as compressors and tanks in the food, beverage, pharmaceutical and chemical industries, or where FDA compliance is required.

In addition, Spirax Sarco safety valves are available with a variety of options, such as PN or ANSI flanges in sizes DN20~DN150, gas-tight bonnets, soft seats, open bonnets, sealing wrenches, special spring materials, etc. (Note: these options are not available for all models, please contact Spirax Sarco for details).

Fourth, quality assurance: from R & D testing to production certification of the full range of control

(i) Specialized R&D and testing

Spirax Sarco has an in-house dynamic test rig with advanced rapid data capture software to document and evaluate the performance characteristics of each safety valve during the development process. Performance tests can be carried out with steam, air and water at pressures up to 45 bar, ensuring reliable product performance.

(ii) Rigorous production and efficient delivery

All Spirax Sarco products are manufactured in strict accordance with ISO 9001 standards. Most valves are designed and developed in-house, relying on the extensive 3DCAD computer-aided design system for product design, and with the aid of advanced machine tool technology, components are produced in modern machining facility centers, then assembled, set up, and packaged by professional staff, and finally shipped from distribution centers. For customers concerned about lead times, Spirax Sarco guarantees same day or next day delivery on many of its standard products.

(iii) Authoritative certification and sealing performance

All Spirax Sarco safety valves have been certified by an independent third party as conforming to internationally recognized standards and meeting the requirements of the European Pressure Equipment Directive PED/UK Pressure Equipment (Safety) Regulations. Closure tightness is an important factor in the performance of safety valves, and every Spirax Sarco safety valve is rigorously tested to meet the American Petroleum Institute's API 527 "Industrial Sealing of Metal-to-Metal Sealed Face Safety Relief Valves" standard. The certificates obtained by Spirotech safety valves cover the standards of many countries and regions, such as AD Merkblatt A2, TRD 421, TRD 721, DIN 3320 in Germany, SAFed-ST, BS 6759 parts 1,2,3 in UK, as well as the European Pressure Equipment Directive 97/23/EC, and KSB 6216 in Korea, which provide a strong guarantee of the quality of the products.

V. User rights and interests: professional support and reliable services

By choosing Spirax Sarco safety valves, users can enjoy multiple benefits:

  • Quality and reliability are guaranteed, and the products comply with a number of international standards and certifications and undergo rigorous testing.
  • The high reliability of the product can reduce equipment downtime, reduce maintenance costs, and save costs for the enterprise.
  • Fast delivery, most of the standard products can be realized the same day or the next day delivery, to meet the urgent needs of enterprises.
  • Spirax Sarco provides technical support, professional knowledge and high quality service worldwide to solve all kinds of problems in the process of use and help enterprises to produce safely and efficiently.

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