Elektro Kalori Ürün Kataloğu

2 27 Size and select combi valves 1 Determine Q 100 Q 100 2 Determine ΔT ΔT 3 Calculate V Water without anti-freeze Q 100 1.163·∆T V 100 = Water with anti-freeze Q 100 · 3600 c· ρ ·∆T V 100 = Select combi valve and actuator 4 Select suitable combi valve a) Type of valve (with / without P/T plugs) b) PN class e) Nominal size DN c) Max. / min. medium temperature f) Medium 5 Determine presetting / dial table in data sheet of the respective combi valve 6 Select actuator a) Operating voltage b) Positioning signal c) Positioning time d) Auxiliary functions 7 Check working range a) Δp < Δp max – maximum permissible differential pressure across the valve’s control path, valid for the entire actuating range of the motorized valve b) Δp > Δp min – minimum differential pressure required across the valve’s control path, so that the differential pressure regulator works reliably 8 Select actuator Combi valve and suitable actuator Selection of valve and actuator 7 Select suitable valve series a) Type of valve (2-port, 3-port, 3-port with bypass) c) PN class d) Nominal size DN e) Max. / min. medium temperature f) Medium 8 Check valve authority P v (control stability) ∆p V100 ∆p VR P V = ≥ 0.25…0.8 ∆p V100 ∆p V100 + ∆p MV P V = ≥ 0.25…0.8 9 Select actuator a) Operating voltage b) Positioning signal c) Positioning time d) Spring return function e) Auxiliary functions 10 Check working range a) Differential pressure Δp max > Δp V0 b) Closing pressure Δp s > H 0 11 Selection Valve and suitable actuator Abbr. Term Unit Δp Differential pressure kPa Pressure differential between plant sections. Δp max Maximum differential pressure kPa Maximum permissible differential pressure across the valve’s control path (when mixing), valid for the entire actuating range of the motorized valve. Δp maxV Maximum differential pressure kPa Maximum permissible differential pressure across the valve’s control path (when distributing), valid for the entire actuating range of the motorized valve. Δp min Minimum differential pressure kPa Minimum differential pressure required, so that the differential pressure regulator works reliably with combi valves. ∆p min depends on presetting position, see data sheet for details. Δp V0 kPa Maximum differential pressure across the valve’s closed control path. Δp V100 Differential pressure at kPa 100 . Δp s Closing pressure kPa For 2-port valves, maximum permissible differential pressure at which the motorized valve will close securely against the pressure (close off pressure). Only valid for 2-port valves. Δp MV kPa MV is not known, in which case typical values can be used. Δp VR kPa ΔT Temperature spread K DN Nominal size Characteristic for matching parts of the piping system. H 0 Shutoff head m The head generated by a pump at closed value, at a given speed and a given pump medium. kPa Unit of pressure kPa 100 kPa = 1 bar = 10 mWC mWS Meter water column m k V m³/h Amount of cold water (5…30 °C) passing through the valve at the respective stroke and at a differential pressure of 100 kPa (1 bar). k VS m³/h en valve (H100) at a differential pressure of 100 kPa (1 bar). Spring return function Shutoff in the event of a power failure. PN PN class Characteristic relating to the combination of mechanical and dimensional properties of a compo- nent in the piping system. Phs Phase cut control signal V DC 0...20 V Phs P v Valve authority Ratio of differential pressure across fully open valve (H100) and differential pressure across valve ve authority of 0.25 is required. Q 100 Rated capacity kW Plant’s design capacity. V 100 m³/h (H 100 ). V min m³/h i valve (H 100 ). ν Kinematic viscosity mm²/s In the case of kinematic viscosities ν up to 10 mm²/s, no corrections are required. For the selection of actuating devices for kinematic viscosities ν above 10 mm²/s, c kJ/kgK ρ kg/m³ Acvatix Valves and Actuators BİNA OTOMASYON ÜRÜNLERİ /SEÇİM TABLOLARI