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

The Castel /C 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 and  bar with a maximum allowable system pressure (PS) of  bar. Suitable for HFC, HCFC, and HFO refrigerants (ASHRAE A).

Key Features:

• Model / P/N: /C (Classic Line)  

• Connections:

  • Inlet: ½″ NPT

  • Outlet: ¾″ G ()

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

• Maximum Operating Pressure (PS):  bar  

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

• Temperature Range: – °C to + °C  

• Compliance: EN , PED //EC; CE marked; supports ASHRAE‑listed refrigerants (R, Ra, RA, RC, RA, R, Rze, RA, RA, RA, RA, RA, etc.)  

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