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Help CenterDanfoss Check Valve Types NRV6-10S,NRV12-18S and NRVH22-35S
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Danfoss Check valve Types NRV6-10S,NRV12-18S and NRVH22-35S introduction
NRV and NRVH can be used in liquid suction and hot gas lines in refrigeration and air conditioning plants. The valves ensure the correct flow direction and prevent back-condensation from a warm part of the system to the cold evaporator. The hermetic tight design of solder versions meet
the environmental demands for today and future. A built-in damping piston makes the valves suitable for installation in lines where pulsation
can occur, e. g. in the discharge line from the compressor.
Danfoss Check valve Types NRV6-10S,NRV12-18S and NRVH22-35S Features
Ensure correct flow direction
Available in both straightway and angleway versions
Prevents back-condensation from warm to cold system part
Hermetic tight design for solder versions
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
Oversize connections provide flexibility in use
Danfoss Check valve Types NRV6-10S,NRV12-18S and NRVH22-35S
Dimensioning and selection
When selecting the right Danfoss check valve
the capacity tables should be utilised together
with plant requirements concerning piping and
connection sizes.
The optimum solution should include the
highest capacity at lowest pressure drop across
the valve before it closes. Further, when
dimensioning and selecting Danfoss 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 completely
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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