Danfoss NRV 19 Check Valve | 3/4 in Flare | 020-1044

Product Description: The NRV 19 (020-1044) is engineered for reliability in demanding Middle Eastern climates. In the UAE—where HVAC systems often utilize multi-compressor racks or complex piping—preventing the migration of refrigerant to the cold evaporator or idle compressors is critical. This valve features a built-in damping piston that makes it suitable for installation in lines where pulsation can occur, such as discharge lines. The 3/4 inch SAE flare connections offer UAE service technicians the advantage of a secure mechanical joint that can be easily installed or replaced in the field without the need for brazing equipment.

Key Features & Benefits:

• Backflow Prevention: Effectively prevents refrigerant migration during system off-cycles, protecting compressors from liquid slugging.
• Pulsation Damping: The internal design minimizes noise and vibration, extending the life of the valve even when placed near the compressor.
• High Working Pressure: Rated for up to 46 bar (667 psig), ensuring full compatibility with high-pressure refrigerants like R410A and R32 used in Dubai.
• Minimal Pressure Drop: The valve is designed to provide high flow capacity ($C_v$ value of 5.8 gpm/psi), maintaining system efficiency.
• Broad Temperature Range: Capable of operating from -50°C to 140°C, making it versatile for both low-temperature refrigeration and high-temperature heat pump applications in the UAE.

Technical Specifications:

FAQs:

• Q: Can the NRV 19 be installed in a vertical line?
• A: Yes, it can be installed in both horizontal and vertical lines, provided the flow direction follows the arrow on the valve body.
• Q: Is the 020-1044 suitable for R410A AC units in the UAE?
• A: Absolutely. Its 46-bar rating is specifically designed to handle the high pressures of R410A and R32 systems.
• Q: Does this valve require regular maintenance?
• A: No, it is a hermetic-like design meant for long-term operation. However, it should be checked if the system experiences unusual pressure drops or backflow issues.