Danfoss SFA 15 safety relief valve, G 1/2 in x 3/4 in, set pressure 21 bar (305 psig), Danfoss pressure certificate (code 148F3221)
Danfoss · HVAC & Refrigeration · Safety Relief Valves
Danfoss SFA 15 angle-way safety relief valve, code 148F3221, set pressure 21 bar (305 psig). The SFA 15 is a standard, direct-loaded, back-pressure-dependent safety relief valve specially designed to protect pressure vessels and other refrigeration components against excessive pressure. The spring housing is closed tightly to avoid refrigerant leakage. On a rise in pressure above the set pressure the valve initially starts to open slightly; it is fully open before the pressure is 10% above the set pressure and fully closed before the pressure is 10% below the set pressure. Inlet connection 15 mm (G 1/2 in) outside pipe thread to ISO 228/1, outlet 20 mm (3/4 in); inlet flow diameter (do) 13 mm (0.512 in), flow area (A0) 133 mm2 (0.206 in2), de-rated certified discharge coefficient (Kdr) 0.73, effective discharge area 97 mm2 (0.150 in2). Housing is special steel approved for low-temperature operation; spindle, cone and seat are stainless steel, and the cone gasket is a special chloroprene (neoprene) compound. Applicable for the refrigerants HCFC, HFC, R717 (ammonia) and R744 (CO2) within a temperature range of -50 to 100 C (-58 to 212 F); below -30 C full tightness is only guaranteed when the refrigerant pressure is equal to or lower than 0.5 x set pressure. The set pressure is adjusted and sealed at the Danfoss factory; supplied with a Danfoss pressure certificate. PED 2014/68/EU conformity assessment category IV, fluid group I, 13 mm nominal bore. Specifications per Danfoss store code 148F3221.
Specifications
- Part number
- 148F3221
- HS code
- 8481.40
- Material
- Special low-temperature steel housing; stainless steel spindle, cone and seat
- Pressure rating
- 21 bar (305 psig) set pressure
- Temperature range
- -50 to 100 C
- Standard size
- G 1/2 in inlet x 3/4 in outlet
- Thread standard
- ISO 228/1
Compatibility
Danfoss SFA 15 safety relief valve. Select strictly by required set pressure (this code is 21 bar / 305 psig); set pressures from 10 to 40 bar are available as separate factory-sealed order codes. The SFA is back-pressure dependent (a back pressure above atmospheric raises the opening pressure). It is recommended to install two valves in pairs together with a DSV 1 or DSV 2 double stop valve. Two certificate options exist at each set pressure: a Danfoss pressure certificate (148F32xx codes) or a TUV pressure-setting certificate (148F33xx codes) - this code carries the Danfoss pressure certificate. Suitable for HCFC/HFC, R717 (ammonia) and R744 (CO2) refrigeration plant. For higher discharge capacity the SFA 15-50 variant uses the same body with a reduced Kdr.
Standards
Approvals
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