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Calculation of closing safety Spherical valve

Hydraulic cylinder r a b α φ a b α T L S S γ φ r L HC
Hydraulic cylinder
Centre of gravity of the weight L c α c
Centre of gravity of the weight

Values for calculation

$a$ $\mathrm{mm}$
$b$ $\mathrm{mm}$
$r$ $\mathrm{mm}$
$φ$ $\mathrm{°}$
$W_W$ $\mathrm{kg}$
$W_R$ $\mathrm{kg}$
$W_L$ $\mathrm{kg}$
$L_c$ $\mathrm{mm}$
$α_c$ $\mathrm{°}$
$P_{L-HC}$ $\mathrm{MPa}$
$D_{HC}$ $\mathrm{mm}$
$μ_B$
$r_T$ $\mathrm{mm}$
$f_B$
$e_S$ $\mathrm{mm}$
$P_S$ $\mathrm{MPa}$
$μ_S$

Calculation

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

$$L=\sqrt{a^2+b^2}$$
$L=\sqrt{a^2+b^2}$
Equations in LaTeX code
L=\sqrt{a^2+b^2}

Friction torque in main sealing

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