Danfoss NRVH 22s Check Valve | 7/8 in Solder ODF | High Differential | 020-1032

Product Description: The NRVH 22s (020-1032) is the high-differential version of the standard NRV series. It features a stronger internal spring, making it ideal for use in the discharge line of compressors connected in parallel (multi-compressor racks) common in UAE supermarkets and industrial cold stores. In the intense heat of Dubai and Abu Dhabi, where pressure fluctuations are frequent, the NRVH 22s prevents backflow and refrigerant migration during off-cycles. Its robust design ensures that it remains tight even at low pressure differentials, while the 7/8 inch ODF connections provide a permanent, leak-proof brazed joint capable of withstanding high system vibrations.

Key Features & Benefits:

• High Opening Pressure: Features a stronger spring ($\Delta p = 0.3$ bar) compared to standard NRV valves, preventing vibration and resonance in discharge lines.
• 46 Bar Working Pressure: Fully optimized for high-pressure refrigerants like R410A and R32, which are standard in modern UAE HVAC installations.
• Oversize Connections: The “s” designation indicates oversize solder connections, allowing for high flow rates with minimal pressure drop.
• Damping Design: Built-in damping piston allows the valve to be installed in lines where pulsation can occur, such as directly after a compressor.
• Broad Temperature Range: Engineered to operate reliably from -50°C to 140°C, covering everything from deep-freeze suction to high-temperature hot gas defrosting.

Technical Specifications:

FAQs:

• Q: Why use NRVH instead of the standard NRV in the UAE?
• A: NRVH is preferred in the UAE for compressor discharge lines because the stronger spring prevents “chatter” and valve damage caused by the gas pulsations common in high-ambient operations.
• Q: Can this valve be installed in any position?
• A: It is recommended to install the valve in a horizontal position to ensure optimal performance and longevity of the internal piston.
• Q: Is it compatible with CO2 systems?
• A: While it has a high pressure rating (46 bar), it is generally used for HFC/HCFC systems. For high-pressure subcritical or transcritical CO2, specialized valves are usually required.