# Calculation of closing safety Butterfly valve

## Values for calculation

## Calculation

### Distance between the axis of rotation of the valve and the axis of the hydraulic cylinder

### Friction torque in main sealing

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$$L=\sqrt{a^2+b^2}$$

$$M_S=D_s^2\cdot e_S\cdot μ_S\cdot P_S\cdot 10^{-6}$$