2/2-way proportional valve

Transcription

1 2/2-way proportional valve High sensitivity Type can be combined with bar DN mm 1/8, 1/4 or sub-base EEx approvals optional Type 8605 Digital control electronics Cable plug version Type 8605 Digital control electronics DIN-rail version Type 2508 Cable plug Type 8611 Universal controller The direct-acting proportional valve Type can be used as a control valve for process control and is suitable for technical vacuum. Low hysteresis, high repeatability and high sensitivity ensure superior regulation behaviour. Thanks to an elastomeric sealing, the valve closes tightly and securely. Circuit function Direct acting 2-way proportional valve, normally closed Valve control takes place through the control electronics of Type 8605, which converts an analogue input signal into a WM signal. Further, functional features of the Type 8605 electronic control unit: Temperature compensation for coil heating by internal current regulation Simple zero and span settings Ramp function to dampen fast status changes Technical Data - valve ody material rass, Stainless steel Seal material FKM, EDM on request Media Neutral gases, liquids Medium temperature C mbient temperature max. +55 C Viscosity max. 21 mm2/s Operating voltage 24 V DC ower consumption 9 W Duty cycle 100 % continuously rated ort connection Sub-base, G 1/8, G 1/4, NT 1/8, NT 1/4, others on request Electric connection Cable plug Type 2508 acc. to DIN EN Form Installation s required, preferably with actuator in upright position Response time (10-90%) <20ms Typical control data Hysteresis Repeatability Sensitivity Turn-down ratio rotection class - valve < 5 % < 0.5 % FS. < 0.25 % FS 1:100 I65 Technical data - control electronics Type 8605 (see separate datasheet) ressure data [bar]: Overpressure with respect to atmospheric pressure WM pulse-width modulation Characteristic data of control behaviour depends on process conditions p. 1/5

2 Characteristics of a proportional valve dvice for valve sizing KV K Vs [V] [m] [m] In continuous flow applications, the choice of appropriate valve size is much more important than with on/off valves. The optimum size should be selected such that the resulting flow in the system is not unnecessarily reduced by the valve. However, a sufficient part of the pressure drop should be taken across the valve even when it is fully opened. Recommended value: Δp valve > 30 % of total pressure drop within the system For that reason take advantage of ürkert competent engineering services during the planning phase! Determination of the kv value ressure drop Subcritical p 2 > 2 Supercritical p 2 < 2 kv value for liquids [m³/h] Q Q ρ 1000 Δp ρ 1000 Δp kv value for gases [m³/h] Q N 514 T 1 ρ N p 2 Δ p Q N T 1 ρ N 257 p1 k V Flow coefficient [m 3 /h] Q N Standard flow rate [m N3 /h] Inlet pressure [bar] p 2 Outlet pressure [bar] Δp Differential presure -p 2 [bar] ρ Density [kg/m 3 ] ρ N Standard density [kg/m 3 ] T 1 Temperature if fluid [(273+t)K] medium measured for water, Δp 1 bar, via the device Standard conditions at bar and 0 C (273K) bsolute pressure p. 2/5

3 Ordering chart ll valves with FKM seal Control function Orifice [mm] ort connection kvs value water [m³/h] kvs value: Flow rate value for water, measured at +20 C and 1 bar pressure differential over a fully opened valve. QNn value: Flow rate value for air with inlet pressure of 6 bar, 1 bar pressure differential and +20 C. ressure data [bar]: Overpressure with respect to atmospheric pressure lease note that the valves are delivered without control electronics unit and cable plug (see ccessory Ordering Information). QNn value [l/min] Maximum pressure [bar] Coil power consumption [W] Maximum coil current [m] rass body Stainless steel body 0.8 sub-base F G 1/ NT 1/ sub-base F G 1/ NT 1/ sub-base F G 1/ NT 1/ sub-base F G 1/ NT 1/ G 1/ NT 1/ sub-base F G 1/ NT 1/ sub-base FK G 1/ NT 1/ sub-base FK G 1/ NT 1/ i Further versions on request Materials Seal material FFKM - Resistant to aggressive media Seal material EDM nalytical Oxygen version art oil-, fat- and silicon free Electrical connection 12 V Coil pprovals Ex version - II 2G EEx m IIC T4, T No. 02 TEX 2094X with or without terminal box UR CS Ordering chart for accessories Cable plug Type 2508 according to DIN EN Form The delivery of a cable plug includes the flat seal and fixing screw Circuitry Voltage / frequency None V C/DC None, with 3 m cable V C/DC Electronic Control Type 8605 lease see Datasheet p. 3/5

4 Dimensions [mm] Threaded body G 1/4 NT 1/4 Sub-base body F01 Sub-base body FK01 Ø DN 46 Threaded body G 1/8 NT 1/ Ø x Ø 4 2 x M4 20 ody Type Threaded G 1/4 NT 1/4 G 1/8 NT 1/ For product inquiries, use the specification sheet for proportional valves! p. 4/5

5 Design data for proportional valves lease fill out this form and send to your local ürkert Sales Centre* with your inquiry or order Company Contact person Note You can fill out the fields directly in the DF file before printing out the form. Customer no. Dept. ddress Tel./Fax Town / ostcode Mandatory fields Quantity Desired delivery date rocess data Medium State of medium Medium temperature liquid C gaseous vaporous Maximum flow rate Q nom Unit: Minimum flow rate Q min Unit: Inlet pressure at nominal operation Outlet pressure at nominal operation Maximum inlet pressure p 2 max mbient temperature C dditional specifications ody material rass Stainless steel Seal material FKM other Note lease state all pressure values as overpressures with respect to atmospheric []. To find your nearest ürkert facility, click on the orange box In case of special application conditions, please consult for advice. We reserve the right to make technical changes without notice. 0903/4_EU-en_ p. 5/5