safety components

Safety valves for hydraulic and solar systems

How can you ensure the longevity and safety of a heating or domestic hot water production system, transforming a potential critical point into a certainty of operational reliability? The answer is the meticulous selection of the most crucial component for protection against overpressure risks: the safety valve. This device is not just a simple accessory; it’s the silent guardian constantly watching over the system’s balance, ready to intervene to prevent damages to the hydraulic system, people and equipment.

In the plumbing and heating sector, pressure management is an important parameter. The thermal expansion of water within a closed circuit, if uncontrolled, can generate forces capable of damaging boilers, water heaters, solar panels, and piping. For this reason, Novasfer designs and manufactures a wide range of safety valves, engineered to provide an immediate, precise, and repeatable response over time. Each component is the result of consolidated know-how and a manufacturing process that prioritizes material quality and mechanical precision, ensuring that every installer can rely on a product that complies with the European regulations and can withstand the most demanding operating conditions.

Boiler safety valve: the heart of system protection

Within a domestic or industrial heating system, the boiler safety valve represents the first and most important line of defense. Its task is to discharge a controlled amount of heat transfer fluid when the internal pressure exceeds a predefined set value, typically 3 bar for residential systems. This operation prevents the achievement of critical pressures that could compromise the integrity of the heat generator. Our 3 bar boiler safety valve is designed to offer maximum intervention sensitivity and a hermetic seal once safe conditions are restored, avoiding water waste and annoying drips.

Novasfer’s range of boiler safety valves, such as the safety valve in boiler 4000 and 5000 series, are made with a high-quality brass body, a precisely calibrated steel spring, and a seal resistant to high temperatures and aging. This combination ensures impeccable operation throughout the entire system’s life cycle, offering peace of mind to both the installer and the end-user. Compliance with the PED (Pressure Equipment Directive) is a further guarantee of our dedication to safety and reliability.

Maintenance and periodic inspection of the safety valve

To ensure the device’s consistent efficiency, periodic inspection is essential. It is recommended to manually operate the discharge knob of the safety valve at least once a year to check for any scaling or blockages that could prevent its proper functioning. This simple operation, performed by a qualified technician during annual boiler maintenance, ensures that the component is always ready to intervene in an emergency, preserving the safety of the entire system.

Water safety valves: control and reliability in every circuit

In addition to boiler applications, overpressure protection is essential in any closed hydraulic circuit, particularly in domestic hot water (DHW) production and storage systems. A water safety relief valve installed on a water heater or storage tank performs the same function, protecting the tank from excessive pressure generated during the water heating phase. The selection of the correct hydraulic safety relief valve depends on the maximum operating pressure of the component to be protected and the volume of the system itself.

The Novasfer range includes specific solutions for these applications, with various pressure settings available to adapt to any design requirement. The reliability of a hydraulic safety relief valve is measured by its ability to resist corrosion and limescale, maintaining its performance over time. For this reason, we use only certified materials and manufacturing processes that guarantee smooth surfaces and impeccable mechanics. A Novasfer water safety relief valve is an investment in the durability and safety of the entire plumbing system.

Adjustable safety relief valve: flexibility for specific applications

In industrial contexts or specific systems where a non-standard set pressure is required, the adjustable safety relief valve offers a flexible and precise solution. This type of valve allows the technician to set the desired intervention value directly on-site, adapting the device to the system’s specific needs. Although most standard hydronic applications require fixed set values for regulatory safety reasons, the flexibility of an adjustable safety relief valve model is an invaluable advantage in complex design scenarios or OEM applications.

Solar Thermal Safety Valve: Managing high temperatures and special fluids

Solar thermal systems present unique challenges. Stagnation temperatures in panels can exceed 200°C, and the heat transfer fluid is often a mixture of water and glycol, which is more aggressive than pure water. In this scenario, a normal heating safety valve is not suitable. A solar safety relief valve specifically designed for solar panels is necessary, constructed with materials capable of withstanding high temperatures and compatible with glycol fluids.

The Novasfer solar thermal safety valve, like our Series 5002 model, has been developed for these extreme conditions. Special seals and selected materials ensure a perfect seal and reliable intervention even after long periods of inactivity at high temperatures. Installing a specific safety valve for solar applications is not only a technical choice but a regulatory obligation to ensure the safety of a system operating under very severe thermal and pressure stress conditions.

Thermal safety valve: protection against overheating in biomass generators

In systems powered by non-pulverized solid fuels, such as wood or pellet boilers, the primary risk is not just overpressure but also overheating. If fluid circulation is interrupted, the temperature in the generator can rise rapidly to boiling. To prevent this danger, a thermal safety valve is installed. Unlike pressure valves, the thermal safety valve activates when a threshold temperature is reached (usually 95-97°C), discharging superheated water and simultaneously introducing cold water from the mains to lower the temperature in the generator.

This device is a legally mandatory safety component in many biomass installations, and its correct installation and operation are fundamental to preventing serious accidents. The precision of the thermal sensor and the reliability of the opening mechanism are the key characteristics that distinguish a high-quality product, ensuring timely and decisive intervention in an emergency.

Material quality: The DNA of Novasfer safety valves

The performance of a safety pressure relief valve depends entirely on the quality of its internal components and the precision with which they are assembled. The valve body, disc, spring, and seals must work in perfect synergy. For this reason, Novasfer pays meticulous attention production process. The springs are calibrated one by one to ensure that the intervention pressure is exactly as rated, with minimal tolerance. Novasfer maintains total control over the supply chain, from hot-forging to brass machining, a competitive advantage that allows us to guarantee a superior and consistent quality standard for every single piece produced.

Solutions for professionals: the Novasfer range and OEM customizations

Our range of producs is aimed at plumbing and heating professionals who do not compromise on safety. The Novasfer range of safety valves covers every possible need: from the 4000 and 5000 Series for standard heating systems, to specific models like the 3095 safety valve, up to solar solutions like the 5002 Series. We also offer insulated versions, such as the 3161-c/ safety unit, specific for optimizing energy efficiency and preventing heat dispersion. For manufacturers of boilers, water heaters, or circulation units, we also offer a customization service. Thanks to our manufacturing flexibility, we are the ideal partner for OEM projects, developing tailored solutions that meet specific technical and aesthetic requirements.

In conclusion, choosing a Novasfer safety valve means installing a product that is synonymous with peace of mind. It means relying on a company that has been designing and manufacturing components for hydraulic system safety for decades, putting its experience at the service of installers, designers, and manufacturers. Ensuring safety is not an option but a duty, and with our solutions, this duty transforms into a simple certainty. In addition to safety components, discover our complete catalog of circulation units for systems, designed with the same philosophy of quality and reliability.