Valve Cv Si Units. The mass flow rate of superheated steam through a valve can be calculated from the valve cv thanks to the following formula : For a specific control valve, flow coefficient cv/kv is determined experimentally by control valve manufacturers, and you can found it in manufacturers technical specifications.
In simple terms, a fully open control valve with a cv of 14 usgpm/psi passes 14 usgpm of fluid with 1 psi pressure drop. 1 watt is equal to 0.0013596216173039 cv. And determining flow through a valve can be simple.
System of units, the cv coefficient is the number of u.s.
Flow coefficient k v ——volumetric flow rate of water at a. Each has space for four simultaneous calculations. Valve sizing calculations (traditional method) 626 technical introduction fisher® regulators and valves have traditionally been sized using equations derived by the company. Approximate flow capacity can be determined for valves by using the given cv factor for a valve and applying them to the following formulae’s.