Data sheet Check valve NRVT For high pressure CO2 application

Data sheet Check valve, NRVT NRVT piston type check valves is designed for installation in discharge line to prevent refrigerant migration to protect compressor and enable the pressure equalization of rotary compressor before startup. In the meanwhile, this valve can be used in other installation positions of CO2 systems such as hot gas and suction lines. • Stable operation covering full map of compressor • Fulfills high temperature and pressure requirements for the discharge lines used in transcritical CO2 systems ° Rupture proof, optimized TIG weldingSpecially-selected sealing material for...

Data sheet Check valve, NRVT • To start rotary BLDC compressors, it is necessary to equalize pressure between discharge and suction line. • In single compressor solution it is possible to manage equalization via high pressure valve and bypass valve • In system with parallel mounted compressors, it is necessary to install a check valve on each compressor's discharge line and a 3 | © Danfoss | Climate Solutions | 2025.09

Data sheet Check valve, NRVT • If using an individual oil separator for each compressor - for protection against back condensation of refrigerant in the separator with the compressor shut-off. • If the cylinder heads of the compressors can cool down below the condensing temperature at standstill • Check valve for a common oil separator (installation position towards the condenser): - Systems with long shut-off periods Hot Gas DefrostFigure: A diagram of Hot Gas Defrost AI405623214680en-000301 4 | © Danfoss | Climate Solutions | 2025.09

Data sheet Check valve, NRVT 5 | © Danfoss | Climate Solutions | 2025.09

Data sheet Check valve, NRVT Identification Relevant product data is available on the product and box label. An example of a box label and product label are shown, including an explanation of the content. Table 2: Box label & product label (example) Product engraving Table: Product engraving Packaging label Check Valve NRVT 10s R744 Danfoss Logo 6 | © Danfoss | Climate Solutions | 2025.09

Data sheet Check valve, NRVT Table: Packaging label The pressure of the fluid passing through a refrigeration system opens the valve, while any reverse flow closes the valve. In NRVT check valve a sealing disc is activated by the spring to close or open the valve, and the force of the spring determines the Min. opening pressure. When the refrigerant flows through the valve and the differential pressure of the flow is higher than the Min. opening pressure, the piston will move towards the stop face and compress the spring, then the valve will open. Figure: Design and materials Materials Position...

Data sheet Check valve, NRVT Pressure and temperature data Low Pressure lift Multi Ejector / cold & warm ambient temperature • Optimal solution for smaller commercial refrigeration systems • In colder ambient conditions system operates as a standard booster system • Ejector is simply controlling the high pressure as a high pressure valve according to the optimal COP Gas Cooler pressure algorithm • Pressure in the receiver as pressure difference between the receiver and Po-MT evaporator suction pressure • Receiver pressure controlled by first gas by-pass valve CCMT#1, second gas by-pass valve...

Data sheet Check valve, NRVT You will find downloadable dimension drawings for individual code numbers on Danfoss store as part of the Visuals tab for individual code numbers. Figure: Dimensions and Weights Certificates, declarations and approvals The list contains all certificates, declarations, and approvals for this product type. Individual code number may have some or all of these approvals, and certain local approvals may not appear on the list. When you click on the link you will be directed to the latest version of the 'Declaration of Conformity'. Products developed and sold before this...

Data sheet Check valve, NRVT Contact details Online support Danfoss offers a wide range of support along with our products, including digital information, software, mobile apps and expert guidance. See the possibilities below. The Danfoss Design center Discover the Design Center, our advanced digital platform that streamlines product selection. With integrated tools and enhanced type pages, it's simpler than ever to access product information and documentation, and to select the right products. Check the availability of Danfoss products at partner locations and enjoy seamless transitions from...