what is the function of non return valve
Check valve A check valve, clack valve, non-return valve, reflux valve, retention valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.[1]
Base oil The least refined type which produced by Solvent Refining. It usually consists of conventional petroleum base oils.
Rate equation k is the first order rate constant, which has units of 1/s or sâˆ’1.
Dividend yield Its reciprocal is the Price/Dividend ratio.