DN - Nominal diameter, mm
D×t – Outer diameter of a pipe to be tied in × wall thickness of a pipe to be tied in
PN – Nominal pressure, MPa
Pp - Operating pressure, MPa
To – Operational temperature of fluid, °С
Тmax - Limiting high temperature of fluid, °С
ξ - Hydraulic resistance coefficient, not more than
Rm - Rotational moment on the shaft (shaft sleeve), Nm;
Fs - Rod force, N;
Fl - Lever force, N;
S - Area of passage, cm2
n - Spindle speed per full stroke
Кᵥ - Discharge rate