V(m3/h)=V1(L/rev)xN(rpm)x60x η（%）
G（T/h）=V（m3/h）xρ（T/m3）xK
V：discharging capacity（m3/h) V1: Rotor volume per revolution（L/rev)
N: rotor speed per minute（rpm） η：Volume efficiency of rotor（%）
ρ：material’s bulk density（T/m3) K: correction factor usually is 0.7~0.8
The above formula is the general one. We will adjust the specific data as per actual working condition.
Some photos on rotary valve with airlock are for a reference :
