- Dn - Nominal diameter, mm
- Pn - Nominal pressure, MPa
- Pp - Operating pressure, MPa
- Tmax - Temperature of working medium, max
- ξ - Flow friction characteristic, max. (determined against inlet nozzle diameter)
- Мкр - Torque of reducer driving shaft (if valve spindle is not driven), Nm
- Kvy - Nominal capacity, min., m3/h