AP21 is a pilot operated 2-port solenoid valve that is NC (open when energized), and AP22 is NO (closed when energized). It has a piston-driven pilot operated poppet structure for air, water, kerosene and oil, with steam as an option. Port sizes run from Rc1 1/4 to Rc2, and 32 to 50 flange types are available.
| Working Fluid | Air / water / kerosene / oil (50 mm²/s or less) (option: steam) |
| Valve Structure | Pilot operated poppet, piston drive, NC (AP21) / NO (AP22) |
| Working Pressure Differential | 0.05 to 1.2 MPa (AP22 0.5 MPa or less) |
| Max. Working Pressure | 1.6 MPa (1 MPa for steam option) |
| Proof Pressure | 3.2 MPa (water pressure) |
| Fluid Temperature | -10 to 60 °C (steam option 5 to 180 °C) |
| Ambient Temperature | -10 to 60 °C |
| Thermal Class | Class 130 (B) (steam option Class 180 (H)) |
| Valve Seat Leakage | 1 cm³/min (ANR) or less (air) (steam option 400 or less) |
| Body/Seal Material | Bronze / NBR (steam option bronze / PTFE) |
| Port Size | Rc1 1/4, Rc1 1/2, Rc2 / 32, 40, 50 flange |
| Rated Voltage | 100 VAC, 200 VAC, 12 VDC, 24 VDC, 48 VDC, 100 VDC |