Pressure relief valve, pilot operated

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1 Pressure relief valve, pilot operated RE 7/0.0 Replaces: 08.0 /8 Type DB. K Nominal sizes 6 and 0 Component series 4X Maximum operating pressure bar Maximum flow 60 l/min (NS6) 00 l/min (NS0) K478- Overview of contents Merkmale Features Ordering details Preferred types Function, section, symbol Technical data Characteristic curves 4 Unit dimensions NS6 Cavity NS6 6 Unit dimensions NS0 7 Cavity NS0 8 Features Cartridge valve 4 pressure stages 4 adjustment types, optional: Rotary knob Sleeve with hexagon and protective cap Lockable knob with scale Rotary knob with scale For information regarding the available spare parts see:

2 /8 Bosch Rexroth AG Hydraulics DB. K RE 7/0.0 Ordering details DB K 4X Y V * Pressure relief valve, pilot operated = DB Nominal size 6 = 6 Nominal size 0 = 0 Cartridge valve = K Adjustment type Rotary knob = Sleeve with hexagon and protective cap = Lockable rotary knob with scale = ) Rotary knob with scale = 7 Component series 40 to 49 = 4X (40 to 49: unchanged installation and connection dimensions) ) H key with material No. R is included within the scope of supply. Y = Futher details in clear text Seal material V = FKM seals (other seals on request) Attention! The compatibility of the seals and pressure fluid is to be taken into account! Internal pilot oil supply, External pilot oil drain Pressure stage 0 = Settable pressure up to 0 bar 00 = Settable pressure up to 00 bar 00 = Settable pressure up to 00 bar = Settable pressure up to bar Preferred types Nominal size 6 Nominal size 0 Type Material No. Type Material No. DB 6 K-4X/0YV R DB 0 K-4X/0YV R DB 6 K-4X/00YV R DB 0 K-4X/00YV R DB 6 K-4X/00YV R DB 0 K-4X/00YV R90048 DB 6 K-4X/YV R DB 0 K-4X/YV R Further preferred types and standard components can be found within the EPS (Standard Price List).

3 RE 7/0.0 DB. K Hydraulics Bosch Rexroth AG /8 Function, section, symbol Pressure valves type DB..K.. are pilot operated pressure relief valves for installation in manifolds. They are used to limit the pressure in a hydraulic system. Setting of the system pressure is via adjustment element (4). At rest, the valves are closed. Pressure in the main port acts on the spool (). At the same time, pressure is passed through orifice () onto the spring loaded side of the spool () and through orifice () to the pilot poppet (6). If the pressure in main port rises above the value set at spring (), then the pilot poppet opens (6). Pressure fluid can now flow from the spring loaded side of the spool (), through the orifice () and 4 7 channel (7) into main port. The resulting pressure drop moves piston () causing this to open the main port from to, whilst the pressure set at spring () is maintained. Pilot oil drain from the two spring chambers is taken externally via main port. Note! Back pressures (main port ) are added to the set pressure. = Main port (P) Type DB 0 K-4X/.YV 6 = Main port (T) = Main port (Y) Technical data (for applications outside these parameters, please consult us!) General Nominal size 6 0 Weight kg Approx. 0. Approx. 0. Installation Optional Ambient temperature range C 0 to +80 Hydraulic Max. operating pressure ) Main port (P) bar Max. settable pressure Main port (P) bar 0; 00; 00; Max. permissible back pressure ) Main port (T) bar Main port (Y) bar Maximum flow l/min Pressure fluid Pressure fluid temperature range C 0 to +80 Viscosity range mm /s 0 to 800 Maximum permissible degree of pressure fluid contamination Cleanliness class to ISO 4406 (c) Mineral oil (HL, HLP) to DIN 4; fast bio-degradable pressue fluids to VDMA 468 (also see RE 90); HETG (rape seed oil); HEPG (polyglycole); HEES (synthetic ester); other pressure fluids on request Class 0/8/ ) ) Attention! The maximum operating pressure results from the sum of the set pressure and the back pressure! ) The cleanliness class stated for the components must be adhered to in hydraulic systems. Effective filtration prevents faults from occurring and at the same time increases the component service life. For the selection of filters see data sheets RE 0070, RE 0076, RE 008, RE 0086 and RE 0088.

4 4/8 Bosch Rexroth AG Hydraulics DB. K RE 7/0.0 Characteristic curves NS6 (measured with HLP46, ϑ oil = 40 C ± C) p E -q V -characteristic curves p E min -q V -characteristic curves Settable pressure in bar Min. settable pressrue in bar Flow in l/min Flow in l/min Attention! The characteristic curves are valid for an outlet pressure = zero over the entire flow range! Characteristic curves NS0 (measured with HLP46, ϑ oil = 40 C ± C) p E -q V -characteristic curves p E min -q V -characteristic curves Settable pressure in bar Min. settable pressure in bar Flow in l/min Flow in l/min Attention! The characteristic curves are valid for an outlet pressure = zero over the entire flow range!

5 RE 7/0.0 DB. K Hydraulics Bosch Rexroth AG /8 Unit dimensions NS6 (nominal dimensions in mm) 60 max max max 7 LS 0 4, 8 Adjustment type "" Adjustment type "" Adjustment type "" 4 Adjustment type "7" Space required to remove the key 6 Locknut 4A/F 7 Hexagon 0A/F 8 Key width 4A/F, tightening torque M A = 0 Nm = Main port (P) = Main port (T) = Main port (Y) LS = Location Shoulder

6 6/8 Bosch Rexroth AG Hydraulics DB. K RE 7/0.0 Cavity NS6; main ports; thread M0 x (nominal size in mm) Rz 6, H8 0, H8 M0 x 7, H8 C B A 0,0 A B C D D Rz 6 LS 0 min 4 4 ) , 8 +0, max , 0 0, Rz 6 = Main port (P) = Main port (T), location; optional about the circumference = Main port (Y) LS = Location Shoulder ) Depth of fit

7 RE 7/0.0 DB. K Hydraulics Bosch Rexroth AG 7/8 Unit dimensions NS0 (nominal dimensions in mm) 4 max max max 4 LS 0 49,4 8 Adjustment type "" Adjustment type "" Adjustment type "" 4 Adjustment type "7" Space required to remove the key 6 Locknut 4A/F 7 Hexagon 0A/F 8 Hexagon 0A/F, tightening torque M A = 0 Nm = Main port (P) = Main port (T) = Main port (Y) LS = Location Shoulder

8 8/8 Bosch Rexroth AG Hydraulics DB. K RE 7/0.0 Cavity NS0; main ports; thread M0 x (nominal dimensions in mm) Rz H8 H8 M4 x H9 0 H8 A B C 0,0 A B C D LS 0, +0, D 4 +0,,±0, +0, +0, 9,±0, ) 0 +0, max 0 Rz 6 0 = Main port (P) = Main port (T), location: optional about the circumference = Main port (Y) LS = Location Shoulder ) Depth of fit Bosch Rexroth AG Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Telefon +49 (0) 9 / 8-0 Telefax +49 (0) 9 / This document, as well as the data, specifications and other informations set forth in it, are the exclusive property of Bosch Rexroth AG. Without their consent it may not be reproduced or given to third parties. The data specified above 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 details stated do not release you from the responsibility for carrying out your own assessment and verification. It must be remembered that our products are subject to a natural process of wear and ageing.

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