{latex}
\large
$$
\left( {\Delta h_{FCM} A_{float} \rho g} \right)L_{float\;lever\;arm}  = \left( {\Delta h_{stock} \rho gA_{orifice} } \right)L_{valve\;lever\;arm}
$$
where $$\Delta h_{FCM}$$ is the 
{latex}