Installation Guide
Differential pressure valve
Type NRD
Brand: Danfoss
Refrigerants
Types: HCFC, HFC and HC
Applicability: Applicable to all common non-flammable / flammable refrigerants, excluding R717 and to noncorrosive gases / liquids dependent on sealing material compatibility.
Design Pressure: The design pressure shall not be less than the value outlined in Section 9.2 of ANSI / ASHRAE 15 for the refrigerant used in the system.
Specifications
Max. Working Pressure
PS/MWP = 46 bar (667 psi)
Media temperature
Min. -50 °C (-58 °F)
Max. 140 °C (285 °F)
Diagrams
System Schematic
A schematic diagram illustrates a refrigeration system. It shows a thermal bulb connected to a differential pressure valve labeled 'NRD'. The outlet of the NRD valve connects to a coil (heat exchanger). Downstream from the coil, a control valve labeled 'KVR' is shown, followed by a component that appears to be a filter or dryer, and then a flow indicator or sight glass. Arrows indicate the direction of refrigerant flow through the system, starting from the bulb, through the NRD, coil, KVR, and back towards the bulb in a closed loop.
Connection Detail
A close-up view shows a pipe connection. A label indicates "Min. 5% Ag", suggesting a minimum silver content in the brazing material used. A hand is depicted applying a flux or cleaning agent to the pipe joint before brazing. Small droplets are shown falling from the joint, possibly indicating flux or cleaning residue. The pipe fitting is labeled "Danfoss 20-41.14".
