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(11 products available)
Danfoss RA valves are available in various models, each designed to suit specific refrigerants and application requirements. A detailed overview of the different Danfoss RA valve types and important revision letters follows. This section will help readers understand how the COMPATIBILITY Table works.
Danfoss RA 294
The RA 294 valve has a fixed setting and cannot be adjusted. For this reason, it is a traditional valve mostly used in simple refrigeration systems. The mechanical box's internal components are not sensitive, meaning a valve that costs less now will likely bring savings later due to the fewer times it needs to be serviced.
Danfoss RA 295
The RA 295 valve features an internal bellows that senses system pressure and adjusts the valve opening accordingly. It is more complex than the RA 294, but the added functionality results in better energy efficiency and system reliability.
Danfoss RA 296
Visible on the RA 296 valve is the external adjustment screw, allowing technicians to fine-tune the valve settings as needed. In systems requiring frequent customization or where operating conditions fluctuate, this valve is especially helpful.
Danfoss RA 297
The RA 297 is designed for low-temperature applications, making it ideal for refrigerants like R-404A and R-507A. This valve mechanism helps maintain an accurate flow to ensure good performance in demanding environments.
Danfoss RA 298
A characteristic of the RA 298 electronic expansion valve is that it is electronically controlled. It offers precise refrigerant flow control, making it ideal for systems needing accurate and responsive flow regulation. An advantage of this valve over the others is that it can be integrated into modern digital HVAC systems for enhanced control.
Danfoss RA 299
The RA 299 is a compact design that enables it to function efficiently in tight spaces. Despite its small size, it maintains robust performance, making it suitable for systems with limited space availability.
Long-lasting RA valves are built to survive harsh refrigeration and HVAC situations. The following factors help provide this durability:
High-quality materials
Danfoss ra valves use high-quality brass materials for the valve bodies, ensuring strength and corrosion resistance. The stems and other critical components are made from durable materials like stainless steel or engineered plastics. This combination of materials provides structural integrity, guarantees that it will not rust, and reduces wear and tear over time, especially in chemical-intensive refrigerant environments.
Precision engineering
Danfoss RA valve designs account for the unique demands of HVAC and refrigeration systems in the extended valve life. For example, avoid using close-tolerance components that can rub against each other and wear out. Also, ensure seals have a snug fit to prevent refrigerant leaks. Precision manufacturing ensures that all parts function as smoothly and efficiently as possible, reducing the mechanical stress that will wear out the valve.
Resistance to temperature extremes
The Danfoss ra valves are made to withstand very high and very low temperatures. The flexibility of the materials helps the valve system to function properly, even when extreme conditions try to temper the constituent materials. This ensures that the valve continues to function as required without loss during the temperature extremes encountered in many of the commercial and industrial applications.
Robust seals
Danfoss RA valves employ high-quality sealing materials that are resistant to wear from different refrigerants. This includes resistance to chemical breakdown by the seal materials themselves. A good seal in the context of a refrigeration system prevents leaks and keeps the internal components well-lubricated so that they do not experience friction-induced wear out. The long-lasting seal hence guarantees the internal mechanism is protected and ensures trouble-free operation.
Extensive testing
Several durability tests are performed by Danfoss to ascertain the reliability of its RA valves in harsh commercial environments. Extreme temperature, pressure, and cycle test help design a valve that can withstand the wear and tear often found in real-world applications. This means that field testing provides longer-lasting equipment with longer field testing.
The RA valves are applied in refrigeration and HVAC systems where accurate refrigerant flow regulation is paramount. Here are some typical uses and the industries that apply them:
Commercial refrigeration systems
The Danfoss RA valves are used to control refrigerant flow in large retail food storage and display cases, walk-in coolers, and freezer units. Keeping the right temperature helps preserve food, including fruits and vegetables, dairy products, meats, etc. Refrigeration food storage companies like restaurants and supermarkets use the RA valve to ensure that their systems remain efficient and reliable.
Industrial refrigeration
In the industrial space, large-scale facilities use Danfoss RA valves in ammonia and other industrial refrigerant systems. Industries that manufacture chemicals, pharmaceuticals, and bulk foods that require precise low-temperature storage all depend on these valves for reliable and accurate flow under the most extreme conditions.
HVAC systems
Commercial air conditioning systems, in particular, employ the RA valve to control expansion in direct metering systems. From the office buildings and schools to hospitals, the RA valve contributes to energy-efficient cooling systems, particularly in systems that require constant performance, such reliability is critical.
transportation and storage solutions
Danfoss RA valves are incorporated into refrigerated trucks, trains, and containers to maintain the right temperature for cargoes like perishable foods, medicines, and flowers while transporting them globally. They are also used in portable refrigeration units and ice packs for their efficiency and reliability during emergency downtime or in remote regions. They control the cooling process in all these systems to ensure that perishable goods arrive at the right temperature and in good condition.
Hydronic heating systems
In hydronic heating systems, the RA valves help control the flow of heating fluid, ensuring that the right amount of heated water or steam is delivered through the system. They are used in areas like office complexes, schools, and hospitals, where dependable and efficient warming is required. In the hydronic system, the HVAC units, industrials & transportation, and temporary works and event venues are applied.
In a Danfoss RA valve selection, the following key factors ensure the chosen valve performs optimally within its designated application:
System refrigerant
The right valve is the one that is designed for the refrigerant being used in the system. Operating safely, efficiently, and reliably requires matching the valve type with the refrigerants, such as ammonia or R-404A. Using a valve not compatible with the refrigerant will cause system failure, safety concerns, and undesired chemical reactions.
System pressure and temperature
Determine the system's operating pressure and temperature range when choosing a Danfoss RA valve. Expansion valves should be able to operate under the system's maximum pressure without failure or by deformation. Ensure the selected valve can withstand those temperatures if the system operates at very low or high temperatures.
Valve capacity
Selecting the right valve is critical, as an oversized valve will cause poor temperature control and inefficient energy usage, while a undersized one will be overworked and eventually fail. Cooling load calculations based on the equipment's capacity and the system's expected airflow will help identify the right valve. Capacity ratings of valves can be found in manufacturer literature.
System design
A direct expansion system requires different kinds of expansion valves, and so would the refrigerant evaporator or the liquid feed line. The system design will dictate whether one option should be prioritized over the others. The selection literature for the Danfoss RA valve contains information on what system designs the various valves are suited for.
Ease of maintenance
Danfoss RA valves are highly reliable and efficient for refrigeration systems or HVAC. However, some models incorporate electronic control for precision, while others are mechanical. Mechanical systems are less complex and therefore easier to fix, but they may not be as efficient. In contrast, the e-control systems are complicated but more efficient. It is, therefore, important to factor in the ease of maintaining the valve when making the selection decision; this concerns the reliability and efficiency needs of the system.
A1: Valves of type RA 297 are specifically designed for this application, which makes them particularly suited for refrigerants such as R-404A and R-507A.
A2: Electronic expansion valves are used where accuracy is required in the refrigerant flow control, whereas mechanical ones work perfectly in less complicated systems.
A3: The system's cooling load and airflow are two primary factors when selecting the capacity ratings of the chosen valve, which one can find in the Danfoss literature.
A4: Yes, many Danfoss RA valves have been designed with maintenance in mind, featuring easily accessible components and a durable build to minimize servicing needs.
A5: Yes, the Danfoss RA 298 electronic expansion valve is an example of a valve that can be easily integrated into such systems for enhanced flow control.
