Pressure reducing valve, direct operated, with pressure monitoring RE 6576/04.09 Replaces: 0.03 /0 ypes DRHD and ZDRHD Size 6 Component series 4X Maximum operating pressure 00 bar Maximum flow l/min H68+60 able of contents Contents Page Features Ordering code Mating connectors Symbols 3 Function, section 4 echnical data 5 Electrical connection 5 Characteristic curves 6 Pressure monitoring 7 Unit dimensions 8, 9 Features For subplate mounting As sandwich plate valve Porting pattern according to ISO 4-03-0-0-05 Subplates according to data sheet RE 4505 (separate order) Clamping pressure adjustment and monitoring in one unit Common adjustment for clamping and monitoring pressure Pressure monitoring optionally either internal or external on the actuator he switching differential between reduced pressure and monitored pressure is adjustable Limitation of the adjustable minimum pressure to be monitored or secondary pressure Information on available spare parts: www.boschrexroth.com/spc
/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Ordering code DRHD 6 D 4X 00 K4 * Subplate mounting = No code Sandwich plate valve = Z Pressure reducing valve with pressure monitoring Size 6 = 6 Direct operated = D Primary pressure in port P (controlled from P ) = P Primary pressure in port P (controlled from A ) = A ) Primary pressure in port P (controlled from B ) = B ) Adjustment type Rotary knob = Hexagon socket with protective cap = Lockable rotary knob = 3 ) Component series to 49 = 4X ( to 49: unchanged installation and connection dimensions) Maximum operating pressure 00 bar = 00 Pressure rating Maximum secondary pressure 5 bar = 5 Maximum secondary pressure 50 bar = 50 Maximum secondary pressure 00 bar = 00 Further details in the plain text Seal material No code = NBR seals (other seals upon request) Attention! Observe compatibility of seals with hydraulic fluid used! Electrical connection K4 3) = Without mating connector single connection with connector acc. to DIN EN 7530-803 No code = Pressure port (for reducing and switching pressure), internal X = Pressure port, external Y = Pressure port (A; B), with shuttle valve (only with sandwich plate valve) ) Only with sandwich plate valve ) H key with material no. R90000858 is included in the delivery. 3) Mating connectors, separate order, see below. Mating connectors according to DIN EN 7530-803 Details and more mating connectors see RE 08006 Color without circuitry with indicator light... V Material no. with rectifier... V with indicator light and Zener diode suppressor circuit 4 V Black R90070 R90070 R900705 R900706
RE 6576/04.09 DRHD; ZDRHD Hydraulics Bosch Rexroth AG 3/0 Symbols ( = component side, = plate side) Subplate mounting ype DRHD 6 DP ype DRHD 6 DP X P A B M P A B X Sandwich plate valve ype ZDRHD 6 DA ype ZDRHD 6 DB P A B P A B ype ZDRHD 6 DP Port has to be drained at zero pressure! P A B ype ZDRHD 6 DP X ype ZDRHD 6 DP Y M P A B X M P A B
4/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Function, section he valve type DRHD is a direct operated 3-way pressure reducing valve with pressure limitation of the secondary circuit and integrated pressure monitoring. It is used to reduce the system pressure and is optionally available with internal or external pressure monitoring, as well as with shuttle valve plate for monitoring from channel A or B. he pressure reducing valve basically comprises of the housing (), the pressure reducing spool (), the pressure monitoring spool (3), two compression springs (4 and 5) as well as an adjustment element (6). he sandwich plate version can be converted into a version for subplate mounting by means of a diversion plate (7) P to A. In the initial position the valve is open. Hydraulic fluid flows from channel P to channel P. Via the pilot line (8), the pressure in channel P is at the same time applied to the pressure reducing spool () and the pressure monitoring spool (3) opposite the compression springs (4 and 5). When the pressure in channel P rises above the value set at the adjustment element (6), the pressure reducing spool () moves against the compression spring (4) into the control position and thereby keeps the set pressure in channel P constant. he pressure reduction results from pressure being applied to the annular area of the pressure reducing spool () from channel P. he secondary pressure which is to be monitored also acts via the pilot line (8) on the front face of the pressure monitoring spool (3) (common pressure chamber for spools () and (3). At a defined pressure which lies below the secondary pressure, the switch (9) is thus actuated. It is, for example, possible to pass on a control signal for positive clamping and to initiate a subsequent process as soon as the required minimum pressure of a clamping unit (tripping pressure for switch) is reached. If the secondary pressure at the clamping unit falls below the minimum pressure, the electric switch changes back. he minimum adjustable monitoring or secondary pressure can be limited using the screw (0). he switching differential between the required minimum clamping pressure and the working pressure for an operating point is set at the spindle () in the factory. When the pressure in channel P continues to increase due to external forces acting on the actuator, the pressure reducing spool () moves further against the compression spring (4). hus, channel P is, via control edge () at the pressure reducing spool () and housing (), connected with the port. Hydraulic fluid continues to flow to the tank until the pressure no longer increases (secondary pressure limitation). he leakage oil drain from the spring chamber (3) is always via channel. 7 ype DRHD 6 DP3 (with diversion plate for subplate mounting) 9 8 B P A B P A ype ZDRHD 6 DP3 3 X B P A 4 5 3 0 6
RE 6576/04.09 DRHD; ZDRHD Hydraulics Bosch Rexroth AG 5/0 echnical data (For applications outside these parameters, please consult us!) general Weight Version No code X Y Installation position hydraulic Subplate mounting kg. 3.0 Sandwich plate valve kg.8.6.6 any Maximum operating pressure Port P bar 00 Maximum secondary pressure Port A bar 5; 50; 00 (subplate mounting) Port P bar 5; 50; 00 (sandwich plate valve) Maximum admissible pressure Port bar (subplate mounting) Port bar (sandwich plate valve) Maximum flow l/min Hydraulic fluid Mineral oil (HL, HLP) according to DIN 554; quickly biodegradable hydraulic fluids according to VDMA 4568 (see also RE 90); HEG (rape oil); other hydraulic fluids upon request Hydraulic fluid temperature range C 30 to +80 Viscosity range mm /s 0 to 800 Maximum permitted degree of contamination of the hydraulic Class 0/8/5 ) fluid - cleanliness class according to ISO 46 (c) electrical Maximum connection cross-section mm.5 Maximum control AC voltage, max. 50 V 0 ma to A current DC voltage, max. 50 V 5 ma to A ype of protection according to DIN EN 6059 IP 6K7 (with mounted and locked mating connector) ) he cleanliness classes specified for the components must be adhered to in hydraulic systems. Efficient filtration prevents malfunctions and at the same time prolongs the service life of components. For the selection of the filters, see data sheets RE 50070, RE 50076, RE 5008, RE 50086, RE 50087 and RE 50088. Electrical connection (plug-in connection) 4
6/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Characteristic curves (measured with HLP46, ϑ oil = C ± 5 C) Subplate mounting p A -q V characteristic curves Sandwich plate valve p A -q V characteristic curves 0 0 Secondary pressure in bar 00 80 60 0 Secondary pressure in bar 00 80 60 0 0 30 0 0 0 0 0 30 0 30 0 0 0 0 0 30 A to P to A P to P to P Flow in l/min Flow in l/min Subplate mounting p-q V characteristic curves Sandwich plate valve p-q V characteristic curves Differential pressure in bar 30 0 0 0 0 0 30 Flow in l/min P to A A to he characteristic curves apply to initial pressure p = zero in the entire flow range! Differential pressure in bar 30 0 4 0 3 0 0 0 30 Flow in l/min 3 P to P 4 P to
RE 6576/04.09 DRHD; ZDRHD Hydraulics Bosch Rexroth AG 7/0 Pressure monitoring 5 Pressure rating 5 50 45 Pressure rating 50 Monitored pressure in bar 8 4 0 6 0 6 0 4 8 5 3 Switching differential adjustable Monitored pressure in bar 35 30 5 0 5 0 5 0 3 5 0 5 0 5 30 35 45 50 Switching differential adjustable Clamping pressure in bar Clamping pressure in bar Monitored pressure in bar 00 90 80 70 60 50 30 0 0 Pressure rating 00 3 Switching differential adjustable Note! Switching differentials for flow q V = 0 l/min. At flows > 0 l/min, the switching differential is reduced. Clamping pressure Signal "clamp" 3 Signal unclamp 0 0 0 30 50 60 70 80 90 00 Clamping pressure in bar
8/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Unit dimensions (dimensions in mm) 5 7; 9 4 65,5 4 A B 0 8 5 30 6 P A B 36 0 39 3 9 8 A B X 0 5 X 3 4 4 M 5 6 A 6 B 7 G/4 G/4 M X X 3 05 G/4 0 37 A 70 B 45 35 A 83 B X P 8 6 F F4 F F3 38 Position explanations and valve mounting screws see page 9. 0,0/00 Rzmax 4 Required surface quality of the valve mounting face
RE 6576/04.09 DRHD; ZDRHD Hydraulics Bosch Rexroth AG 9/0 Unit dimensions Nameplate Mating connector without circuitry (separate order, see page ) 3 Mating connector with circuitry (separate order, see page ) 4 Space required to remove the mating connector 5 Shuttle valve (only with sandwich plate valve, version Y ) 6 Pressure connection plate (only with version X ) 7 Adjustment type 8 Adjustment type 9 Adjustment type 3 0 Seal ring for port X Identical seal rings for ports A, B,, P (plate side) Internal hexagon 6 A/F 3 Hexagon 7 A/F 4 Diversion plate for subplate mounting 5 Space required to remove the key 6 Porting pattern according to ISO 4-03-0-0-05 (differing from standard: port X) Valve mounting screws (separate order) 4 hexagon socket head cap screws ISO 476 - M5-0.9-flZn-h-L Friction coefficient µ total = 0.09 to 0.4, tightening torque M = 7 Nm ±0%
0/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. he data specified 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. he 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.
RE 6576/04.09 DRHD; ZDRHD Hydraulics Bosch Rexroth AG /0 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. he data specified 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. he 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.
/0 Bosch Rexroth AG Hydraulics DRHD; ZDRHD RE 6576/04.09 Notes Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 (0) 93 5 / 8-0 Fax +49 (0) 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. he data specified 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. he 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.