Pressure reducing valve, pilot operated

Pressure reducing valve, pilot operated RE 689/. Replaces:.3 / Type DR Size to Component series X Maximum operating pressure 3 bar Maximum flow l/min K66/9 Table of contents Contents Page Features Ordering code Symbols Function, section 3 Technical data Characteristic curves to 7 Unit dimensions 8 to Installation bore Features For subplate mounting Porting pattern according to ISO 78 For threaded connection s cartridge valve adjustment types, optional: Rotary knob ushing with hexagon and protective cap Lockable rotary knob with scale Rotary knob with scale pressure ratings Check valve, optional (only subplate mounting) More information: Subplates Data sheet 6 Information on available spare parts: www.boschrexroth.com/spc

/ osch Rexroth G Hydraulics DR RE 689/. Ordering code DR X * Complete valve = no code (Subplate mounting or threaded connection) Pilot valve = C without main spool insert (cartridge valve) (do not enter size) Pilot valve = C with main spool insert (cartridge valve) (enter valve size 3) Size Subplate mounting " " Ordering code Threaded connection "G" = = (G/) 6 = (G3/) = = (G) = (G /) = 3 = 3 (G /) s cartridge valve = no code (version "C", without main spool insert) s cartridge valve = (version "C", with main spool insert) For subplate mounting = For threaded connection = G djustment type for pressure adjustment Rotary knob = ushing with hexagon and protective cap = (always with maximum pressure adjustment) Lockable rotary knob with scale = 6 ) Rotary knob with scale = 7 = Further details in the plain text Seal material No code = NR seals V = FKM seals (other seals upon request) ttention! Observe compatibility of seals with hydraulic fluid used! No code = With check valve (only for subplate mounting) M = Without check valve Pilot oil supply Pilot oil supply internal, pilot oil return external = Set pressure up to bar = Set pressure up to bar = Set pressure up to bar 3 = Set pressure up to 3 bar 3 = Set pressure up to 3 bar (only version "M") X = Component series to 9 ( to 9: unchanged installation and connection dimensions) ) H-key with Material no. R988 is included in the delivery. Symbols Type DR M Type DR

RE 689/. DR Hydraulics osch Rexroth G 3/ Function, section Pressure valves type DR are pilot operated pressure reducing valves that are controlled from the secondary circuit. The pressure reducing valves basically comprise of a main valve () with main spool insert (3) and pilot control valve () with pressure adjustment element. asic principle: In rest position, the valves are open. Hydraulic fluid flows from channel via the main spool insert (3) to channel without obstructions. The pressure available in channel acts on the lower main spool side. t the same time, the pressure is applied to the spring-loaded side of the main spool (3) via the nozzle () and at the ball (6) in the pilot control valve () via the channel (). It also acts on the ball (6) via nozzle (7), control line (8), check valve (9) and nozzle (). Depending on the spring () setting, a pressure builds up in front of the ball (6), in the channel () and in the spring chamber (), which keeps the control spool (3) in opened position. The hydraulic fluid in channel can flow via the main spool insert (3) to channel without obstructions until a pressure builds up in channel that exceeds the value set at the spring () and opens the ball (6). The control spool (3) moves in closing direction. The desired reduced pressure is achieved if there is a state of equilibrium between the pressure in channel and the pressure set at the spring (). The pilot oil return from the spring chamber () is always effected externally via the control line () into the tank. For the free flow back from channel to channel, you can optionally install a check valve (6). pressure gauge connection (7) allows for the control of the reduced pressure in channel. 9 6 3 8 7 7 a a 3 Type DR..--X/... Section a - a 6 without check valve with check valve

/ osch Rexroth G Hydraulics DR RE 689/. Technical Data (For applications outside these parameters, please consult us!) general Size 6 (type DR..) (type DR..) Weight Subplate mounting Type DR.. kg 3..3 8. Installation position Cartridge valve Type DRC kg. Type DRC 3 kg. Threaded connection Type DR..G kg.3....8 mbient temperature range C 3 to + (NR seals) to + (FKM seals) hydraulic ny Maximum operating pressure Port bar 3 ) Maximum inlet pressure Port bar 3 ) Maximum outlet pressure Port bar 3 ) Operating pressure range Port bar to 3 ) Maximum backpressure Port bar 3 ) Minimal set pressure bar Flow-dependent (see characteristic curves page ) Maximum set pressure bar ; ; ; 3; 3 ) Maximum flow Subplate mounting l/min 3 Hydraulic fluid Threaded connection l/min 3 3 See table below Hydraulic fluid temperature range C 3 to +8 (NR seals) to +8 (FKM seals) Viscosity range mm /s to 8 Maximum permitted degree of contamination of the hydraulic Class /8/ ) fluid - cleanliness class according to ISO 6 (c) Hydraulic fluid Classification Suitable sealing materials Standards Mineral oils and related hydrocarbons HL, HLP, HLPD NR, FKM DIN HETG NR, FKM Environmentally Insoluble in water HEES FKM compatible ISO 38 Soluble in water HEPG FKM ISO 38 Water-free HFDU, HFDR FKM ISO 9 Flame-resistant HFC (Fuchs Hydrotherm 6M, Water-containing Petrofer Ultra Safe 6) NR ISO 9 Important information on hydraulic fluids! For more information and data on the use of other hydraulic fluids refer to data sheet 9 or contact us! Flame-resistant water-containing: Maximum operating pressure bar Maximum hydraulic fluid temperature 6 C Expected service life as compared to HLP hydraulic oil There may be limitations regarding the technical valve 3 % to % data (temperature, pressure range, service life, maintenance intervals, etc.)! ) 3 bar only possible with version without check valve ) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and at the same time increases the service life of the components. For the selection of the filters see www.boschrexroth.com/filter.

RE 689/. DR Hydraulics osch Rexroth G / Characteristic curves (measured with HLP6, ϑ oil = C ± C) Outlet pressure in bar 3 3 3 Outlet pressure p depending on the flow q V ( to ) 3 3 3 Flow in l/min Size Size 3 Size Minimum set pressure with p min depending on the flow q V ( to ) 6 6 Reduced pressure in bar 8 6 3 3 3 Flow in l/min 7 Size Size 3 Size p min Performance limit (system-dependent) Size 6 Size 7 Size The characteristic curves apply to the pressure at the valve output p T = bar across the entire flow range.

6/ osch Rexroth G Hydraulics DR RE 689/. Characteristic curves (measured with HLP6, ϑ oil = C ± C) p-q V characteristic curves ( to ; lowest pressure differential adjustable) Pressure differential in bar 8 6 3 3 3 Flow in l/min Size Size 3 Size Pilot flow depending on flow ( to ) and pressure differential, Pilot flow in l/min,, 3 3 3 Flow in l/min Size Size 3 Size p = bar p = bar

RE 689/. DR Hydraulics osch Rexroth G 7/ Characteristic curves (measured with HLP6, ϑ oil = C ± C) 3 p-q V characteristic curves across the check valve ( to ) Pressure differential in bar 3 3 Flow in l/min 3 Size Size 3 Size Flow resistance across check valve, main stage closed Flow resistance across check valve with completely opened main stage

8/ osch Rexroth G Hydraulics DR RE 689/. Unit dimensions: Type DRC ; cartridge valve (dimensions in mm). 7 3 ; 6 8 9 9 G/; 8 69 8 3 39, 3 9 8 6 3 3, 8 6 8, 9 Installation bore, see page. X 3 9 6 37,. Name plate. port for pilot oil return external. port optionally for pilot oil return external 3 djustment type "" djustment type "" djustment type "6" 6 djustment type "7" 7 Hexagon SW 8 Space required to remove the key 9 Valve mounting bores Seal rings Main spool insert Seal ring 3 Seal ring Seal ring Support ring 6 Support ring Valve mounting screws (separate order) hexagon socket head cap screws ISO 76 - M8 x -.9-flZn-h-L with friction coefficient µ total =.9 to., Tightening torque M = 3 Nm ± %, Material No. R9

RE 689/. DR Hydraulics osch Rexroth G 9/ Unit dimensions: Type DR ; threaded connection (dimensions in mm) 9 G/; 8. 69 8 7 3 ; 6 8 Ø3 Ø 3 Ø, G/; D ØD T 7 6 T D ØD 7 9 7 8 Ø7 Ø39, 3 9 8 7 9 Size D ØD T G/ 3 6 (Type DR G ) G3/ 6 (Type DR G ) G 7 8 (Type DR G ) G / 8 (Type DR 3 G ) G / 6 Name plate. port for pilot oil return external 3 djustment type "" djustment type "" djustment type "6" 6 djustment type "7" 7 Hexagon SW 8 Space required to remove the key 9 Valve mounting bores 7 Pressure gauge connection

/ osch Rexroth G Hydraulics DR RE 689/. Unit dimensions: Type DR ; subplate mounting (dimensions in mm) 9 8 69 8 3 H G/;. 7 3 ; 6 8 39, 3 9 8 H 9 6 H3 G/; 7 8. L L3 L6 6 L L L 9 9 3 Item explanations, subplates, and valve mounting screws, see page. L7 L8 9 X L9 L,/ Rzmax Required surface quality of the valve mounting face Size L L L3 L L L6 L7 L8 L9 L 96 3. 33.9. 7.. 3.8 3.8 6 37. 3. 6.3 39.7..6. 9. 33 9.8 8. 9.. 6.7.6 6.7 67. Size 3 H H H3 8 66.7 8.8 7.9 9 8 9. 79. 73 6. 38 76 96.8 9.8 3.8 3 6

RE 689/. DR Hydraulics osch Rexroth G / Unit dimensions Name plate. port for pilot oil return external. port optionally for pilot oil return external 3 djustment type "" djustment type "" djustment type "6" 6 djustment type "7" 7 Hexagon SW 8 Space required to remove the key 9 Valve mounting bore 7 Pressure gauge connection 8 Identical seal rings for ports and ; identical seal rings for ports X and 9 Port without function (blind hole) Locating pin Subplate mounting: Subplates according to data sheet 6 (separate order) Size G 6/ (G3/8) G 6/ (G/) Size G / (G3/) G 3/ (G) Size 3 G / (G /) G / (G /) Valve mounting screws (separate order) Size hexagon socket head cap screws metric ISO 76 - M x -.9-flZn-h-L with friction coefficient µ total =.9 to., Tightening torque M = 6 Nm ± %, Material no. R937 Size ISO 76 - M x 6 -.9-flZn-h-L with friction coefficient µ total =.9 to., Tightening torque M = 6 Nm ± %, Material no. R936 Size 3 6 ISO 76 - M x 7 -.9-flZn-h-L with friction coefficient µ total =.9 to., Tightening torque M = 6 Nm ± %, Material no. R936

/ osch Rexroth G Hydraulics DR RE 689/. Installation bore (dimensions in mm) Z Rz 8 9, 6,,8, H7 8, +,,/, x 3 Rzmax x X, x Rz 8 Rz 6 7 3 max R,3 6 +, +, +,,, 8,8 +, M; 6 3 View "Z" 6 x M8; X Note! The Ø bore can tap a Ø bore at any point. However, it must be observed that the connection bores and the valve mounting bores are not damaged! support ring and seal rings must be inserted into the bore before assembly of the main spool 6 3 Nozzle, separate order osch Rexroth G Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +9 () 93 / 8- Fax +9 () 93 / 8-3 8 documentation@boschrexroth.de www.boschrexroth.de This document, as well as the data, specifications and other information set forth in it, are the exclusive property of osch Rexroth G. It may not be reproduced or given to third parties without its consent. The 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. 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.