Refrigeration Check Valves Type Nrv Nrvh

NRV and NRVH can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plant with fluorinated refrigerants.
NRV and NRVH can also be supplied with oversize connections providing flexibility in the use of check valves.

Features
The valve ensures only correct flow direction
Both straightway and angleway version
Prevents back-condensation from warm to cold evaporator
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 is supplied with spring to
P = 0.3 bar.
Used in refrigeration plant with compressors connected in parallel.

Oversize connections provide flexibility in use.

Technical data
Max. Working pressure
PB = 28 bar
Max. Test pressure
P' = 36, 4 bar
Temperature of the medium
50 140 C
Dimensioning and selection
When dimensioning and selecting check valves to be mounted into the compressor discharge line, it is important to be aware of the following:
The differential pressure across the check valve must always be higher than the given
Minimum pressure drop at which the valve is completely open. This also applies to lowest capacities for compressors with capacity
Regulation.
In refrigeration plant with compressors connected in parallel, it is advantageous to use NRVH equipped with a stronger spring than NRV.
With check valve, type NRVH, resonance problems can be avoided at partial load in the
Refrigeration plant. The differential pressure across NRVH at partial load must not be lower than minimum pressure drop for NRVH
With completely open valve.