DANFOS Check valve Type NRV and NRVH For Air conditioning
NRV and NRVH piston type check valves are designed for installation in commercial refrigerating systems and in residential or industrial air conditioning plants.
They are used to control the unidirectional €ow of refrigerant so as to prevent back€ow.
Features :
• Available in both straightway and angleway versions which is easy to connect
• Hermetic tight design for solder versions with low risk of external leakage
• Built-in damping piston that makes the valves suitable for installation in lines where pulsation can occur, e.g. in the discharge line from the compressor
• NRVH type check valve is with stronger spring and it's recommended to use for compressors in parallel (i.e. power packs) where higher level of pulsation and vibration are expected
• Low pressure drop during operation
• Oversize connections provide €exibility in use
Functions:
NRV/NRVH are used to control the unidirectional €ow of refrigerant so as to prevent back€ow. When selecting the right Danfos check valve, it's recommended to use Coolselector which is a Danfos calculation and selection software. When dimensioning and selecting Danfos check valves for mounting into the compressor discharge line, it is important to be aware of the following:
The differential pressure across the valve must always be higher than the given minimum pressure drop at which the valve is open. This also applies to lowest capacities for compressor with capacity regulation. NRVH type check valve is with stronger spring and it's recommended to use for compressors in parallel (i.e. power packs) where higher level of pulsation and vibration are expected.
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