Castel – 3030/44C – Safety Relief Valve ½″ NPT × ¾″ G, adjustable 9–50 bar

The Castel 3030/44C is a classic pressure-relief valve optimized for refrigeration and HVAC systems. Featuring an inlet of ½″ NPT and outlet of ¾″ G, it’s calibrated between 9 and 50 bar with a maximum allowable system pressure (PS) of 55 bar. Suitable for HFC, HCFC, and HFO refrigerants (ASHRAE A1).

Key Features:

• Model / P/N: 3030/44C (Classic Line)  

• Connections:

  • Inlet: ½″ NPT

  • Outlet: ¾″ G ()

• Set Pressure Range: 9–50 bar (factory or field adjustable)  

• Maximum Operating Pressure (PS): 55 bar  

• Orifice & Flow: 113 mm² opening, discharge coefficient Kd = 0.90  

• Temperature Range: –50 °C to +150 °C  

• Compliance: EN 378, PED 2014/68/EC; CE marked; supports ASHRAE‑listed refrigerants (R22, R134a, R404A, R407C, R410A, R507, R1234ze, R448A, R449A, R450A, R452A, R513A, etc.)  

• Construction Details: Brass body, direct-loaded spring mechanism, tamper-resistant calibration nut; no dynamic seals for reliable long-term operation