Proportional pressure reducing valve, pilot operated

Transcription

1 Proportional pressure reducing valve, pilot operated RE 29178/4.5 Replaces: /1 Types DRE(M) and DRE(M)E Size 32 1) Component series 4X Maximum operating pressure 315 bar Maximum flow 3 L/min H2448 Table of contents Contents Page Features 1 Ordering code, preferred types 2 Symbols 2 Function, section 3, 4 Technical data 4, 5 Electrical connection, cable sockets 6 Control electronics 5, 7 Characteristic curves 8, 9 Unit dimensions 1 1) For sizes 1 and 25, see data sheet RE Information about available spare parts: Features Valve for reducing an operating pressure Operation by proportional solenoid For subplate mounting: Position of ports according to DIN 2434 form D, subplates to data sheet RE 4562 (separate order), see page 1 Optional check valve between and Optional maximum pressure relief function Valve and control electronics from a single source For controlling types DRE and DREM: nalogue amplifier type VT-VSP1(K)-1 in Euro-card format (separate order), see page 5 Digital amplifier type VT-VSPD-1 in Euro-card format (separate order), see page 5 nalogue amplifier type VT 113 of modular design (separate order), see page 5 Types DREE and DREME with integrated electronics (OE): Low manufacturing tolerances of the command value/ pressure characteristic curve Ramp times can be set independently for pressure build-up and pressure reduction

2 2/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Ordering code Without maximum pressure relief function = No code With maximum pressure relief function = M For external control electronics = No code With integrated electronics (OE) = E Size 32 = 3 Component series 4 to 49 = 4X (4 to 49: unchanged installation and connection dimensions) Pressure stage 5 bar = 5 1 bar = 1 2 bar = bar = 315 Pilot oil drain always external, = separate, and at zero pressure to tank With check valve between and = No code Without check valve = M Preferred types DRE 3 4X G24 * Further details in clear text Seal material M = NR seals, suitable for mineral oil (HL, HLP) to DIN V = FKM seals suitable for phosphate ester (HFD-R) Electrical connection for DRE; DREM: K4 = Without cable socket, with component plug to DIN EN Cable socket separate order see page 6 For DREE; DREME K31 = Without cable socket, with component plug to DIN EN Cable socket separate order see page 6 Supply voltage of control electronics G24 = 24 V DC Type DREE 3-4X/5MG24K31M DREE 3-4X/1MG24K31M DREE 3-4X/2MG24K31M DREE 3-4X/315MG24K31M Material no. R R R R Symbols DRE 3-4X/...M DREM 3-4X/...M DRE 3-4X/... DREM 3-4X/... DREE 3-4X/...M DREME 3-4X/...M DREE 3-4X/... DREME 3-4X/...

3 RE 29178/4.5 DRE(M); DRE(M)E Hydraulics osch Rexroth G 3/1 Function, section Valves of types DRE and DREM are pilot operated pressure reducing valves. They are used for reducing an operating pressure. These valves basically consist of a pilot control valve (1) with proportional solenoid (2), a main valve (3) with main spool insert (4) and optionally a check valve (5). Type DRE... The pressure in channel is adjusted by a proportional solenoid (2) in relation to a current. t the rest position no pressure in channel the spring (11) holds the main spool (4) in the initial position. The connection from channel to is open. The pressure in channel acts on the bottom side of the main spool in the direction of closing, and the pressure of the pilot control valve on the spring side of the main spool in the direction of opening from channel to. The pilot oil is taken from channel and flows through the bore (6) to the constant-flow control valve (9) that keeps the pilot oil flow constant independently of the pressure drop between channel and. The pilot oil flows from the constant-flow control valve (9) through bores (7) via the valve seat (1), passes the valve poppet (8) and is directed into the channel to the tank. The pressure desired in channel is pre-selected on the associated amplifier. The proportional solenoid pushes the valve poppet (8) against the valve seat (1) and limits the pressure in the spring chamber (12) to the set value. t the control position of the main spool (4), the hydraulic fluid flows from channel to and generates pressure in channel (setting of the pilot control valve plus spring (11)). When the set pressure is reached in, a balance of forces is achieved on the main spool. When the actuator connected to port is not moving (e.g. cylinder piston at end position), and a lower pressure is set in channel via the proportional solenoid (2), the main spool (4) closes the connection from to and at the same time opens the connection from channel to the spring chamber (12) of the main spool (4). t this position, the compressed volume in channel can expand via the pilot control valve (1) and port. check valve (5) can optionally be installed to allow a free return flow from channel to. The reduced pressure in channel can be checked by means of a pressure gauge port (13). Type DREM... For the hydraulic protection against impermissibly high electrical control currents on the proportional solenoid, which inevitably result in high pressures in port, a spring-loaded pressure relief valve can optionally be installed as maximum pressure relief feature (14) X-X 5 X X Type DRE. 3-4X/..G24K4 (with check valve)

4 4/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Function, section Types DREE and DREME with integrated electronics (OE) In terms of function and design, these valves correspond to types DRE and DREM, except for the integrated electronics. The electronics accommodated in a housing (15) receives the supply voltage and command value voltage via the cable socket (16). The command value/pressure characteristic curve (zero point on valve seat (1) and gradient on I max po ten tio me ter (R3) in the electronics) is adjusted in the factory with narrow manufacturing tolerances. The ramp time for pressure build-up and pressure reduction can be adjusted independently of each other using two potentiometers. For further information on the integrated electronics, see page Technical data (for applications outside these parameters, please consult us!) General data Weight DRE and DREM kg 8.6 DREE and DREME kg 8.7 Installation orientation Optional Storage temperature range C 2 to + 8 mbient DRE and DREM C 2 to + 7 temperature range DREE and DREME C 2 to + 5 Hydraulic (measured with HLP 46; ϑ oil = 4 C ± 5 C ) Max. operating pressure Ports and bar 315 Port Separately and at zero pressure to tank Max. set pressure Pressure stage 5 bar bar 5 in channel Pressure stage 1 bar bar 1 Pressure stage 2 bar bar 2 Pressure stage 315 bar bar 315 Min. set pressure in channel with zero command value bar See p min -q v characteristic curve on page 9 Maximum pressure relief function (infinitely adjustable): djustment range: Factory setting: Pressure stage 5 bar bar 3 to 7 to 7 bar Pressure stage 1 bar bar 5 to 13 to 13 bar Pressure stage 2 bar bar 9 to 23 to 23 bar Pressure stage 315 bar bar 15 to 35 to 35 bar Max. flow of main valve L/min 3 Pilot oil flow L/min See characteristic curve on page 9

5 RE 29178/4.5 DRE(M); DRE(M)E Hydraulics osch Rexroth G 5/1 Technical data (for applications outside these parameters, please consult us!) Hydraulic (measured with HLP 46; ϑ oil = 4 C ± 5 C ) Hydraulic fluid Mineral oil (HL, HLP) to DIN 51524, phosphate ester (HFD-R) Hydraulic fluid temperature range C 2 to + 7 Viscosity range mm 2 /s 15 to 38 Max. permissible degree of contamination of the hydraulic fluid - cleanliness class to ISO 446 (c) Class 2/18/15 1) Hysteresis % ± 2.5 of max. set pressure Repeatability % < ± 2 of max. set pressure Linearity % ± 3.5 of max. set pressure Manufacturing tolerances DRE and DREM % ± 2 of max. set pressure of comand value/pressure DREE and DREME % ± 1.5 of max. set pressure curve referred to hysteresis curve, increasing pressure Switching time ms 1 to 3 (depending on system) Electrical Supply voltage V 24 DC Min. solenoid current DRE and DREM m 1 DREE and DREME m 1 Max. solenoid current DRE and DREM m 8 (corresponds to 1 % command value) DREE and DREME m 144 to 176 Solenoid coil resistance Cold value at 2 C Ω 19.5 with DRE / DREM; 5.4 Ω with DREE / DREME Max. hot value Ω 28.8 with DRE / DREM; 7.8 Ω with DREE / DREME Duty cycle % 1 Electrical connection DRE and DREM With component plug to DIN EN Cable socket to DIN EN ) DREE and DREME With component plug to DIN EN Cable socket to DIN EN ) Type of protection of valve to EN 6529 IP 65 with cable socket mounted and locked 3) Control electronics For DREE and DREME Integrated in the valve, see page 7 For DRE and DREM mplifier in Euro-card format analogue VT-VSP1(K)-1 to data sheet RE 3111 (separate order) digital VT-VSPD-1 to data sheet RE 3123 mplifier of modular design (separate order) analogue VT 113 to data sheet RE ) The cleanliness classes specified for components must be adhered to in hydraulic systems. Effective filtration prevents malfunction and, at the same time, prolongs the service life of components. For the selection of filters, see data sheets RE 57, RE 576, RE 581, RE 586 and RE ) Separate order, see page 6 3) Special types of protection on enquiry Note: For details regarding environment simulation testing in the fields of EMC (electromagnetic compatibility), climate and mechanical stress, see RE U (declaration on environmental compatibility).

6 6/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Electrical connection, cable sockets (nominal dimensions in mm) Connection to component plug Connection to cable socket PE 1 2 PE 1 2 to amplifier For types DRE, DREM for external control electronics Cable socket to DIN EN Separate order under material no. R ,5 1 25V GDM 43 ~1 34,2 1 1 Fixing screw M3, titghtening torque M T =.5 Nm 5,5 For types DREE, DREME with integrated electronics (OE) Cable socket to DIN EN Separate order under material no. R (made of plastic) 91 Ø27 Ø6,5 Ø11 C D F E For the pin assignment, see block circuit diagram on page 7.

7 RE 29178/4.5 DRE(M); DRE(M)E Hydraulics osch Rexroth G 7/1 Integrated electronics (OE) for types DREE, DREME Function The integrated electronics is controlled via both differential amplifier connections D and E. The ramp generator generates from a command value stepchange ( to 1 V or 1 to V) a delayed rise or drop of the solenoid current. The rise time can be adjusted by means of potentiometer R14, the drop time of the solenoid current using potentiometer R13. The maximum ramp time of 5 s is only possible over the full command value range. With minor command value changes, the ramp time shortens. The command value/solenoid current characteristic curve is adjusted to the valve by means of the characteristic curve generator so that non-linearities in the hydraulic system are compensated for and a linear command value/pressure characteristic curve is obtained. The current regulator regulates the solenoid current independently of the solenoid coil resistance. Potentiometer R3 can be used for changing the gradient of the command value/current characteristic curve and hence the gradient of the command value/pressure characteristic curve of the proportional pressure control valve. Potentiometer R43 is used for adjusting the biasing current. Its setting should not be changed. If required, the zero point of the command value/pressure characteristic curve can be adjusted on the valve seat. The power stage of the electronics for controlling the proportional solenoid is a chopper amplifier. It is pulse-width-modulated and has a clock frequency of 3 Hz. The solenoid current can be measured at the two measuring sockets MP1 and MP2. voltage drop of.352 V at the measuring shunt corresponds to a solenoid current of 1.6. lock circuit diagram / pin assignment of integrated electronics Command value to 1 V V reference potential Supply voltage: U eff : 22 to 33 V V D + E F C + n.c. n.c. Dif fe rential amplifier U = U = Ramp generator R 14 R 13 Ram p up Power supply unit Ram p down +U +7,5 V -7,5 V Char. curve generator Internal reference point Current regulator I max I min R 3 I R 43 3 Hz = Oscillator +U Chopper amplifier Measuring shunt R =.22 Ω V Solenoid MP1 1,6 =,352 V MP2 Supply voltage Power supply unit with rectifier Single-phase rectification or three-phase bridge : U eff = 22 to 33 V Residual ripple content on the power supply unit: < 5 % Output current: I eff = max. 1.4 Supply cable: Recommendation: 5-wire.75 or 1 mm 2 with protective conductor and shield Outer diameter 6.5 to 11 mm Shield to V supply voltage Max. permissible length 1 m The minimum supply voltage of the power supply unit depends on the length of the supply cable (see diagram). In the case of lengths > 5 m, a capacitor of 22 µf must be provided near the valve in the supply cable. Min. supply voltage in V Length of supply cable in m,75 mm 2 1 mm 2

8 8/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Characteristic curves (measured with HLP46, ϑ oil = 4 C ± 5 C) Pressure in channel in dependence on command value (measured at flow of L/min from to and with associated control electronics) Pressure in channel in bar Pressure stage 5 bar Dead range 1 Druck im Kanal in bar Pressure stage 1 bar Dead range Command value in % Command value in % 1 Pressure in channel in bar Pressure stage 2 bar Dead range Pressure in channel in bar Pressure stage 315 bar Dead range Command value in % Command value in % 1 Note: In order that the lowest settable pressure is achieved, the biasing current must not exceed max. 1 m. Pressure in channel in dependence on flow q v Pressure in channel in dependence on pressure in channel Pressure in channel in bar Pressure in channel in bar , Flow in L/min Pressure in channel in bar

9 RE 29178/4.5 DRE(M); DRE(M)E Hydraulics osch Rexroth G 9/1 Charcteristic curves (measured with HLP46, ϑ oil = 4 C ± 5 C) p min -q v characteristic curve Min. set pressure in bar Flow in L/min Pressure differential from to across check valve Pilot oil flow Pressure differential in bar Flow in L/min Pilot oil flow in L/min 3, 2, 1,4 1, Flow in L/min

10 1/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Unit dimensions (nominal dimensions in mm) , , ,7 24,6 42,1 113 Ø 6 7; 1 6 Ø 18 Ø 11 3, Pg ,8 8 59,5 6 62,7 67, , ,5 244,5 (with integrated electronics) This port (G1/4) is plugged when the valve leaves the factory. fter the plug was removed, the port can be used for separate external pilot oil draining to tank at zero pressure. 2 Space required to remove cable socket 3 Nameplate 4 Maximum pressure relief valve type DREM When using these valves, observe the technical data on page 4! 5 Check valve, optional 6 Locating pin 7 Pilot oil drain always external and separately at zero pressure to tank 8 lind counterbore 9 Identical seal rings for ports and 1 Identical seal rings for port and blind counterbore (item 8) 11 Pressure gauge port G 1/4; 12 deep 12 Cable socket for type DRE(M) (separate order, see page 6) 13 Cable socket for type DRE(M)E (separate order, see page 6) 14 Integrated electronics (OE), type DRE(M)E with component plug K31 Subplates according to data sheet RE 4562 and valve fixing screws must be ordered separately. Subplates: G 414/1 (G 1 1/4) G 415/1 (G 1 1/2) Valve fixing screws: 6 off M1 x 7 DIN , Tightening torque M T = 75 Nm Tolerances according to: General tolerances ISO 2768-mK Tolerancing principle ISO 815,1/1mm Rzmax 4 Required surface finish of the mating part osch Rexroth G Hydraulics Zum Eisengießer Lohr am Main, Germany Phone +49 () / 18- Fax +49 () / documentation@boschrexroth.de This document, as well as the data, specifi cations and other information set forth in it, are the exclusive property of osch Rexroth G. Without their consent it may not be reproduced or given to third parties. The data specifi ed above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The given information does not release the user from the obligation of own judgement and verifi cation. It must be remembered that our products are subject to a natural process of wear and aging.

11 RE 29178/4.5 DRE(M); DRE(M)E Hydraulics osch Rexroth G 11/1 Notes osch Rexroth G Hydraulics Zum Eisengießer Lohr am Main, Germany Phone +49 () / 18- Fax +49 () / documentation@boschrexroth.de This document, as well as the data, specifi cations and other information set forth in it, are the exclusive property of osch Rexroth G. Without their consent it may not be reproduced or given to third parties. The data specifi ed above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The given information does not release the user from the obligation of own judgement and verifi cation. It must be remembered that our products are subject to a natural process of wear and aging.

12 12/1 osch Rexroth G Hydraulics DRE(M); DRE(M)E RE 29178/4.5 Notes osch Rexroth G Hydraulics Zum Eisengießer Lohr am Main, Germany Phone +49 () / 18- Fax +49 () / documentation@boschrexroth.de This document, as well as the data, specifi cations and other information set forth in it, are the exclusive property of osch Rexroth G. Without their consent it may not be reproduced or given to third parties. The data specifi ed above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The given information does not release the user from the obligation of own judgement and verifi cation. It must be remembered that our products are subject to a natural process of wear and aging.