Pressure relief valve, pilot operated, Types ZDB and Z2DB

Transcription

1 RE 5 76/0.0 Replaces:.95 Pressure relief valve, pilot operated, Types ZDB and ZDB Nominal size 0 Series 4X Maximum operating pressure 5 bar Maximum flow 00 L/min K 457/5 Type ZDB 0 VD 4X/ V Overview of contents Contents Page Features Ordering details Preferred types Symbols Function, section Technical data 4 Characteristic curves 4 Unit dimensions 5 to 7 Features Sandwich plate valve Porting pattern to DIN 4 40 Form A, ISO 440 and CETOP RP H 4 pressure stages 6 circuit options With or pressure relief cartridges 4 adjustment elements: Rotary knob Sleeve with hexagon and protective cap Lockable rotary knob with scale Rotary knob with scale 00 by Bosch Rexroth AG, Industrial Hydraulics, D-978 Lohr am Main All rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated using electronic systems, in any form or by means, without the prior written authorisation of Bosch Rexroth AG. In the event of contravention of the above provisions, the contravening party is obliged to pay compensation. ZDB, ZDB /8 RE 5 76/0.0

2 Ordering details Sandwich plate = Z With pressure valve cartridges = (only for versions VC and VD) Pressure relief valve = DB Nominal size 0 = 0 Relief function from to: A TA = VA P TA = VP TA = VT B = VB A TA and B = VC A B and B A = VD ) H-key to Material No. R is included within the scope of supply Z DB 0 4X V * V = Further details in clear text FKM seals (other seals on request) Attention! The compatibility of the seals and pressure fluid has to be taken into account! 50 = Settable pressure up to 50 bar 00 = Settable pressure up to 00 bar 00 = Settable pressure up to 00 bar 5 = Settable pressure up to 5 bar 4X = Series 40 to 49 (40 to 49: unchanged installation and connection dimensions) Adjustment element = Rotary knob = Sleeve with hexagon and protective cap = Lockable rotary knob with scale ) 7 = Rotary knob with scale Preferred types (readily available) Material No. R R R R R R R R R R R R Type ZDB 0 VA-4X/50V ZDB 0 VA-4X/00V ZDB 0 VA-4X/5V ZDB 0 VB-4X/50V ZDB 0 VB-4X/00V ZDB 0 VB-4X/5V ZDB 0 VP-4X/50V ZDB 0 VP-4X/00V ZDB 0 VP-4X/5V ZDB 0 VC-4X/50V ZDB 0 VC-4X/00V ZDB 0 VC-4X/5V Further preferred types and standard components can be found in the EPS (Standard Pric List). RE 5 76/0.0 /8 ZDB, ZDB

3 Symbols ( = component side, = subplate side) Type ZDB 0 VA.. Type ZDB 0 VB.. Type ZDB 0 VP.. Type ZDB 0 VT.. Type ZDB 0 VC.. Type ZDB 0 VD.. Function, section Pressure valves types ZDB and ZDB are pilot operated pressure relief valves of sandwich plate design. They are used to limit the pressure within a hydraulic system. They basically consist of the housing (7) together with one or two pressure relief valve cartridges. The system pressure is set by means of the adjustment element (4). At rest, the valve is closed. Pressure in port A acts on the spool (). At the same time pressure is applied via orifice (), on to the spring loaded side of the spool () and via orifice () on to the pilot poppet (6). If the pressure in port A rises above the value set on spring (5), then the pilot poppet (6) opens. Fluid can now flow from the spring loaded side of spool (), orifice () and channel (8) into port T. The resulting pressure drop moves the spool () causing this to open the connection from A to T, while the pressure set at spring (5) is maintained. Pilot oil return from the two spring chambers is taken externally via port T TA A P B Type ZDB 0 VA-4X/ V TA A P B ZDB, ZDB /8 RE 5 76/0.0

4 Technical data (for applications outside these parameters, please consult us!) Pressure fluid Mineral oil (HL, HLP) to DIN 5 54; Fast bio-degradable pressure fluids to VDMA (also see RE 90 ); HETG (rape seed oil); HEPG (polyglycols); HEES (synthetic ester); Other pressure fluids on request Pressure fluid temperature range C 0 to +80 Viscosity range mm/s 0 to 800 ISO code cleanliness class Maximum permissible degree of contamination of the pressure fluid is to ISO 4406 (C) class 0/8/5 ) Maximum operating pressure bar 5 Maximum settable pressure bar 50; 00; 00; 5 Maximum flow L/min 00 Weight Type ZDB 0 kg Approx..4 Type ZDB 0 kg Approx..6 ) The cleanliness class stated for the components must be adhered too 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 catalogue sheets: RE , RE and RE Characteristic curves (measured with HLP46, ϑ oil = 40 C ± 5 C) p E -q V -characteristic curves p E min -q V -characteristic curves Settable pressure in bar Lowest settable pressure in bar Flow in L/min Flow in L/min The characteristic curves are valid for the outlet pressure = zero over the entire flow range! VD (A to B) VA VB, VC 4 VP, VD (B to A) RE 5 76/0.0 4/8 ZDB, ZDB

5 Unit dimensions: types ZDB 0 VA, VP and VT (dimensions in mm) L L L H H Ø Ø 5,7,5 50,5 48,5 Ø L Ø TA A P B 46 B 9 4 L5 L6 L7 50,8 4 x Ø 6,7 0,0/00mm R max4 Required surface finish of the mating piece VA and VP VT B H 6 5 L 7 8 L 0 94 L 7 05 L L L L Name plate Adjustment element "" Adjustment element "" 4 Adjustment element "" 5 Adjustment element "7" 6 Space required to remove the key 7 Valve fixing holes 8 Locknut 4A/F 9 Hexagon 0A/F 0 Identical seal rings for ports A, B, P, TA, Seal plate 70 x 80 x.5 (only for versions VA and VP) Counter bores (only for version VT) Versions ZDB 0 VA and VP 4 Version ZDB 0 VT 5 Hexagon 0A/F, = 50 Nm Valve fixing screws M6 DIN 9-0.9, = 5.5 Nm, must be ordered separately. For X and Y ports (e.g. for NS 0 pilot operated directional valves) the special version SO0 is required! ZDB, ZDB 5/8 RE 5 76/0.0

6 Unit dimensions: type ZDB 0 VB (dimensions in mm) , Ø Ø 0, Ø 0 54 P 8 0,7 A B 46 5 Ø 5 69 TA 4 x Ø 6,7 4, ,0/00mm R max4 Required surface finish of the mating piece Name plate Adjustment element "" Adjustment element "" 4 Adjustment element "" 5 Adjustment element "7" 6 Space required to remove the key 7 Valve fixing holes 8 Locknut 4A/F 9 Hexagon 0A/F 0 Identical seal rings for ports A, B, P, TA, Seal plate 70 x 80 x.5 5 Hexagon 0A/F, = 50 Nm Valve fixing screws M6 DIN 9-0.9, = 5.5 Nm, must be ordered separately. For X and Y ports (e.g. for NS 0 pilot operated directional valves) the special version SO0 is required! RE 5 76/0.0 6/8 ZDB, ZDB

7 0 9 8 Unit dimensions: types ZDB 0 VC and VD (dimensions in mm) L L4 6 L L5 L L6 L7 Ø 0 Ø 0 6,5 Ø 0,5 Ø 5, P Ø 5 5 A B 0, ,5 9 TA L8 L0 4 x Ø 6,7 L L9 VC VD L L 07 L L L L L L L L0 6 L 6 Name plate Adjustment element "" Adjustment element "" 4 Adjustment element "" 5 Adjustment element "7" 6 Space required to remove the key 7 Valve fixing holes 8 Locknut 4A/F 9 Hexagon 0A/F 0 Identical seal rings for ports A, B, P, TA, 5 Hexagon 0A/F, = 50 Nm Valve fixing screws M6 DIN 9-0.9, = 5.5 Nm, must be ordered separately. For X and Y ports (e.g. for NS 0 pilot operated directional valves) the special version SO0 is required! 0,0/00mm R max4 Required surface finish of the mating piece ZDB, ZDB 7/8 RE 5 76/0.0

8 Notes Bosch Rexroth AG Industrial Hydraulics D-978 Lohr am Main Zum Eisengießer D-9786 Lohr am Main Telefon / 8-0 Telefax / 8-58 Telex documentation@boschrexroth.de Internet Bosch Rexroth Limited Cromwell Road, St Neots Cambs, PE9 ES Tel: / 56 Fax: / info@boschrexroth.co.uk 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. RE 5 76/0.0 8/8 ZDB, ZDB