When pressure changes in the piping cause flow reversal, check valves protect pumps and other equipment from damage caused by backflow.
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Danfoss
DANFOSS CHECK VALVE
The Danfoss NRV and NRVH check valves are optimized for use in liquid, suction and hot gas lines in air conditioning applications to ensure correct flow direction
Castel
CASTEL CHECK VALVE
The valve ensures that refrigerant only flows in one direction.
Allows for internal pressure relief in the standstill system or during maintenance.
Optimized for use in liquid, suction and hot gas lines