Proportional pressure reducing valve, direct operated, increasing characteristic curve Type DRE05SK

Transcription

1 Proportional pressure reducing valve, direct operated, increasing characteristic curve Type DRESK RE 6469 Edition: Replaces: Size Series 1X Maximum control pressure 3 bar Maximum working pressure bar Maximum flow 3 l/min (at p 7 bar) HD8137 Features Direct-operated proportional pressure reducing valve for reducing system pressure Cartridge valve Mounting cavity R/DRE TP Suitable for mobile applications ctuated via proportional solenoid In case of power failure, minimum pressure is set Self-air bleeding pole tube Main application: Gear shifting Contents Ordering details 2 Preferred types 3 Functional description 3 Technical data 4 Characteristic curves 6 Permissible working range 7 Dimensions 8 vailable individual components 1 Related documentation 1 RE 6469/7.218, Bosch Rexroth G

2 2 DRESK Proportional pressure reducing valve Ordering details Ordering details DRE S K 1X / N Z V * Valve type 1 Proportional pressure reducing valve, direct operated, electric actuation DRE 2 Size 3 Increasing characteristic curve S 4 Cartridge valve K Series Series 1 to 19 (unchanged installation and connection dimensions) 1X Maximum control pressure 1) 6 2 bar 2 2 bar 2 3 bar 3 Filter 7 Filters in P P Filters in and P 8 Proportional solenoid, switching in oil Supply voltage 9 Electronic controls 12 V DC G12 Electronic controls 24 V DC G24 Manual override 1 Without manual override N Electrical connection 2) 11 Device connector 2-pin DT 4-2P (German) K4 Device connector 2-pin, Junior Timer (MP) C4 Connector orientation 12 Radial Z Sealing material 13 FKM (fluoroelastomer) V 14 Further details in plain text * For valve types other than those listed in the data sheet, consultation is required. 1) Other pressure stages on request 2) Plug-in connectors are not included in the scope of delivery and must be ordered separately, see data sheet 86. Bosch Rexroth G, RE 6469/7.218

3 Proportional pressure reducing valve DRESK Preferred types 3 Preferred types Type Material number Type Material number DRE SK1X/2PG12NK4ZV R DRE SK1X/2PG12NC4ZV R DRE SK1X/2PG12NK4ZV R DRE SK1X/2PG12NC4ZV R DRE SK1X/3PG12NK4ZV R DRE SK1X/3PG12NC4ZV R DRE SK1X/2PG24NK4ZV R DRE SK1X/2PG24NC4ZV R DRE SK1X/2PG24NK4ZV R DRE SK1X/2PG24NC4ZV R DRE SK1X/3PG24NK4ZV R DRE SK1X/3PG24NC4ZV R Functional description General The proportional pressure reducing valve type DRESK is a direct operated cartridge valve in 3-way design. It reduces the control pressure (port ) proportional to the solenoid current and works largely independently from the inlet pressure (port P). Minimum pressure is set in case of power failure or if the setpoint value is. The actuation takes place via a proportional solenoid. The inside of the solenoid is connected with the control pressure port and filled with hydraulic fluid. With these valves, the system pressure can be reduced continuously depending on the electrical setpoint value. The valve is suitable for actuating gears, couplings, pumps and directional valves, as well as for use in proportional pilot controls (particularly in the mobile applications area). Basic principle The valve regulates the pressure in the port proportional to the current on the solenoid. Version S means an increasing characteristic curve, i.e. rising current causes increasing pressure (see characteristic curve on page 6). The proportional solenoid converts the electric current into mechanical force that acts on the control spool via the anchor. The control spool controls the connection between the main ports. Occurring tank pressure (port T) adds up to the control pressure (port ). P T P T = Control pressure port P = Pump port T = Tank port RE 6469/7.218, Bosch Rexroth G

4 4 DRESK Proportional pressure reducing valve Technical data Technical data General Weight (approx.) kg.4 Installation position ny mbient temperature range C 4 to +12 Salt spray test according to ISO 9227 hr. 72 (NSS test) Solenoid surface protection Coating according to DIN 962-Fe//ZnNi with thick film passivation Hydraulics Maximum control pressure Port p bar 2, 2, 3 (others on request) Maximum inlet pressure Port P p E bar (9 bar including pressure peaks) Counter-pressure Port T p T bar Depressurized (maximum 3 bar) Counter-pressure increases set pressure, even when current I = Flow (Δp 7 bar) P q V l/min 3 T q V l/min 3 Maximum leakage flow Port T q L ml/min (p E = bar; I = ; ν = 46 mm 2 /s) verage pilot flow ml/min 4 (Δp = 1 bar; I = I max ; ν = 46 mm 2 /s) (max. 6) Hydraulic fluid See table on page Hydraulic fluid temperature range ϑ C 3 to +12 bar (standard) 4 to +12 (on request) Viscosity range ν mm 2 /s 3.7 to limited function to 4 full function 4 to 2 limited function Maximum admissible degree of contamination of hydraulic Class 2/18/1 1) fluid (cleanliness level) according to ISO 446 (c) Load cycles 1 mil. Hysteresis (within tolerance range) bar 1.2 (8 % control pressure, PWM 2 Hz) Repeatability % < 3 from maximum control pressure Step response (depending on system) % 1 % ms 7 ( bar in P; ν = 46 mm 2 /s, q V = l/min, 1 % % ms dead volume in = 14 cm 3 ) Mesh width mesh filter element Port P ( optional) µm 18 1) Cleanliness levels specified for the components must be maintained in the hydraulic systems. Effective filtration prevents malfunctions and simultaneously extends the service life of the components. To select filters, visit We recommend a filter with a minimum retention rate of β 1 7. Bosch Rexroth G, RE 6469/7.218

5 Proportional pressure reducing valve DRESK Technical data Electrical Voltage type DC voltage Supply voltage U V Maximum control current I max m Coil resistance Cold value at 2 C Ω Duty cycle (ED) 2) % See characteristic curve on page 7 Maximum coil temperature 2) C 18 Type of protection according to ISO 263 Connector version C4 IP6K with installed and locked plug-in connector IP6K9K with Rexroth plug-in connector, Material no. R Connector version K4 IP6K and IP6K9K with installed and locked plug-in connector Connector orientation s desired (rotatable) Electronic controls (separate order) Type R... analog amplifier (Data Sheet 923) Type RC... BODS controller (data sheets 924, 92, 926) Recommended PWM frequency Hz 2 2 Dither frequency (on request) 3) Design according to VDE 8 The technical data was determined at a viscosity of ν = 46 mm 2 /s (HLP46; ϑ oil = 4 C). Please contact us if the unit will be used outside the specified range of values. For the electrical connection, a protective earth (PE ) connection is mandatory based on the specification. Hydraulic fluid Hydraulic fluid Classification Suitable sealing Standards Data sheet materials Mineral oils HL, HLP FKM DIN Biodegradable insoluble in water HEES FKM ISO soluble in water HEPG FKM ISO 138 Further information and details on using other hydraulic fluids are available in the above data sheets or on request. Restrictions are possible with the technical valve data (temperature, pressure range, service life, maintenance intervals, etc.). The flash point of the hydraulic fluid used must be 4 K above the maximum solenoid surface temperature. Biodegradable: When using biodegradable hydraulic fluids that are also zinc-solving, zinc may accumulate in the fluid. 2) Due to the arising surface temperatures of the solenoid coils, the standards ISO and ISO 4413 must be observed. 3) The dither frequency is to be optimized after the application. The use temperature range is to be observed. RE 6469/7.218, Bosch Rexroth G

6 6 DRESK Proportional pressure reducing valve Characteristic curves Characteristic curves p-i-characteristic curve with tolerance band Control pressure 2 bar, 12 V Control pressure 2 bar, 24 V Pressure differential Δp T Control current I [] Pressure differential Δp T Control current I [] Control pressure 2 bar, 12 V Control pressure 2 bar, 24 V Pressure differential Δp T Control current I [] Pressure differential Δp T Control current I [] Control pressure 3 bar, 12 V Control pressure 3 bar, 24 V Pressure differential Δp T Control current I [] Pressure differential Δp T Control current I [] Characteristic curves measured with HLP46, ϑ oil = 4 ± C. Bosch Rexroth G, RE 6469/7.218

7 Proportional pressure reducing valve DRESK Permissible working range 7 p-q V -flow characteristic curve Pressure differential Δp T T P Flow q V [l/min] Permissible working range Minimum terminal voltage on the coil, relative duty cycle and permissible working range depending on the ambient temperature 12 V (R nom = 4.1 Ω; ϑ coil max = 18 C; I nom = 1.4 ) (1) Minimum required voltage on the coil [V] mbient temperature [ C] (2) Permissible continuous power supply [] at 1% duty cycle The characteristic curves were determined for coils with valve for medium test block size (8 x 8 x 8 mm), w/o flow in still air. Depending on installation conditions (block size, flow, air circulation, etc.) heat dissipation may be better. This increases the range of applications. In specific instances, unfavorable conditions may limit the range of applications. 24 V (R nom = 17. Ω; ϑ coil max = 18 C; I nom =.69 ) (1) Minimum required voltage on the coil [V] mbient temperature [ C] (2) Permissible continuous power supply [] at 1% duty cycle RE 6469/7.218, Bosch Rexroth G

8 8 DRESK Proportional pressure reducing valve Dimensions Dimensions [mm] Dimensions DRESK, Design C4 DRESK, Design K P T P T Ø Plug-in connector for device connector C4 (separate order, see Data Sheet 86) 2 Plug-in connector for device connector K4 (separate order, see Data Sheet 86) 3 Recommended mounting bolts (separate order): 2 pieces M according to ISO 4762 tightening torque: luminum: M = 6 +2 Nm GGG4: M = 6 +2 Nm steel: M = 6 +2 Nm 4 Filter on port optional 17. Bosch Rexroth G, RE 6469/7.218

9 Dimensions [mm] Proportional pressure reducing valve DRESK Dimensions 9 Mounting cavity R/DRE TP; 3 main ports B E Rz 8 B 22H8 (+.33) E Rz 8.. B 2.H8 (+.33) E Rz 8.1/ 8 B B Z 6 min max. 3) Rz 8.2 B M6 (2 ) min. 36 min. 3.2± max min. 1.7±.1 4) 2.±.1 X X P 4) 22 min. 3 min. 12 (2 ) 16 (2 ) T 4) (T) 1);4) 2.2 min min. B.1 B Rz1 max 8 C R ) Z 1 ±1 8 min. 3) TK ± X 2) B ) Rz /Pt 2 3 ±1 1) Optional position of T 2) Rounded and burr-free 3) Contact surface 4) Minimum required cross-section: mm 2 ) Visual check RE 6469/7.218, Bosch Rexroth G

10 1 DRESK Proportional pressure reducing valve vailable individual components vailable individual components 998 Item Designation Material no. 998 Seal kit of the valve (FKM) R Related documentation Electronic controls: nalog amplifier Type R Data sheet 923 BODS controller Type RC Data sheets 924, 92, 926 Mineral oil-based hydraulic fluids Data sheet 922 Environmentally acceptable hydraulic fluids Data sheet 9221 Filter selection MTTF D values Data sheet 9294 Bosch Rexroth G Zum Eisengießer Lohr am Main, Germany Phone: info.ma@boschrexroth.de Bosch Rexroth G 218. ll rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights. The data specified within only serves to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. Bosch Rexroth G, RE 6469/7.218