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The orifice is indicated as nominal equivalentorifice (DN). This is the diameter of the smallest cross section of flow, measured in [mm],that the medium of the valve flows through.
The pressure differential is the maximumpressure drop over the valve by the operatingfunctions of the valve. Valves for alternatingcurrent have higher values as direct currentvalves. The minimum pressure difference isthe smallest pressure drop, by which thevalve still reliably operates.
The flow coefficient "kv" is a specific volume-tric through flow, referenced to the mediumwater (temperature 5 °C to 40 °C), that flowsthrough a a valve with a given orifice size by apressure difference of 1 bar.
The static pressure is the maximum pressurethat the connections of the valve can with-stand.
The viscosity is the flow resistance of amedium determined through the inner frictionof the valve. The dynamic viscosity is listedin our catalog, which are expressed in theunits of mm²/s (Centistroke) and °E ( °Engler).
The response time is expressed as the maxi-mum number of actuation per second. Theswitch on time is the time between the clo-sing of the current flow and final impact of theplunger in its end position. The switch offtime is the time between the opening of thecurrent flow and the arrival of the plunger inits rest position.