506 Parker Hannifin Corporation Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 NORMALLY CLOSED Port size Orifice Ø Flow factors Operating Pressure Differential Fluid Temp. Seat Seal Parker Valves Power Coil Group Dwg. No. Valve Ref. Housing Ref. Coil Ref. Min Max(MOPD) Min Max BSP mm Kv l/min KV m3/h Qn l/min bar AC bar DC bar °C °C AC W DC W FLOW RATE FOR LIQUIDS The liquid flow through a pipe or a valve is given by: Where Q = Flow [l/min] ΔP = Differential Pressure [bar] γ = Density of the fluid [kg/dm3] (water γ = 1 [kg/dm3]) kv = Flow Factor [l/min ] Flow factor kv: The kv flow factor of a valve is defined as the flow rate of water in litres per minute with a pressure drop of 1 bar across the valve. Valve manufactuerers use different definitions for kv. It may be expressed in l/h or m3/h. Care should therefore be taken when comparing values. Maximum flow rate Qmax. For particular 2-way valves the maximum flow must be limited for reasons of mechanical resistance and durability. A very high flow velocity may dislocate a popet sealing or a diaphragm. Maximum flow rates are indicated in the catalogue. Q = Kv • √ ΔP γ Flow factors Kv l/min KV m3/h Qn l/min TECHNICAL INFORMATION
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