Pressure cut-off valve, pilot operated Type DA 6 V

1 DA 6 V1/8RE 26 404 2003by Bosch Rexroth AG, Industrial Hydraulics, D-97813 Lohr am MainAll rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated usingelectronic systems, in any form or by any means, without the prior written authorisation of Bosch Rexroth the event of contravention of the above provisions, the contravening party is obliged to pay of contentsContentsPageFeatures1 Ordering details2 Preferred types2 Symbols2 Function, section3 Technical data4 Characteristic curves4 and 5 Unit dimensions6 and 7 Circuit examples8RE 26 404 : cut-off valve, pilot operatedType DA 6 VNominal size 6 Series 4 XMaximum operating Pressure 315 barMaximum flow 30 L/minType DA 6 For subplate mounting:Porting pattern to DIN 24 340 Form A, without locating pinhole (standard)Porting pattern to ISO 4401 and CETOP RP 121 H, withlocating pin hole, (ordering details.)

2 /60 at the end of the valvetype code)Subplates to catalogue sheet RE 45 052(separate order) As cartridge valve (Cavity to ISO 7789) 4 adjustment elements: Rotary knob Sleeve with hexagon and protective cap Lockable rotary knob with scale Rotary knob with scale 4 Pressure stagesRE 26 404 6 V*DA 6V 4X RE 26 404 detailsFurther details in clear textNo code = Without locating pin hole /60 1) = With locating pin holeM =NBR sealsV =FKM seals(other seals on request) Attention!The compatibility of the seals and pressurefluid must be taken into account!10 = Switching Pressure differential 10%17 =Switching Pressure differential 17%Settable Pressure range 50 = 30 to 50 bar100 = 50 to 100 bar200 = 100 to 200 bar315 = 200 to 315 barPressure cut-off valve= DANominal size 6= 6 pilot operated = VFor subplate mounting: Pump connection in P (standard)= P Pump connection in A= AAs cartridge valve (without check valve)= KRotary knob= 1 Sleeve with hexagon and protective cap= 2 Lockable rotary knob with scale= 3 Rotary knob with scale= 7 Series 40 to 49= 4X(40 to 49: unchanged installation and connection dimensions)Preferred types (readily available)Type DA 6 DA 6 (Y)ATP (X)B (X)PTA (Y)Further preferred types and standard units canbe found in the EPS (Standard Price List).

3 1)Locating pin 3 x 8 DIN EN ISO 8752, Material No. R900005694(separate order)TypeMaterial numberDA 6 VP2 4X/100 10MR900051309DA 6 VP2 4X/200 10MR900052037DA 6 VP2 4X/200 17MR900052038DA 6 VP2 4X/315 10MR900051311DA 6 VA2 4X/100 17MR900051318DA 6 VA2 4X/200 17MR900204554DA 6 VA2 4X/315 17MR900051322 TypeMaterial numberDA 6 VK1 4X/100 17MR900051334DA 6 VK1 4X/315 17MR900051336DA 6 VK2 4X/100 10MR900051337DA 6 VK2 4X/200 10MR900052034DA 6 VK2 4X/315 10MR900051339DA 6 VK2 4X/200 17MR900205113DA 6 V3/8RE 26 404 valves type DA are pilot operated Pressure cut-off purpose is to pass the pump flow into the accumulator circuituntil the accumulator is charged and the necessary accumulatorpressure is achieved. In systems with high and low Pressure pumps,the low Pressure pump flow is directed to tank when the cut-offpressure is Pressure cut-off valve basically comprises of the housing (1),cartridge valve (2) with adjustment element (3), pilot control element(4), main spool (5) and check valve (6).

4 Pressure cut-off valve type DA 6 VPDiverting the pump flow from P to B to P to pump delivers via the check valve (6) into the hydraulic system (Pto B). At the same time the Pressure fluid acts on spool (8) via controlline (7), and via orifice (9) on the spring loaded side of the mainspool (5) and via the orifice (10) on the pilot poppet (11). As soon asthe cut-off Pressure set at the adjustment element (3) in the hydraulicsystem is exceeded, the pilot poppet (11) lifts against the compressionspring (12), from seat (14). pilot oil flows via the orifices (9) and (10), as well as the seat (14) toport A. The resulting Pressure drop lifts the main spool (5) from itsseat and opens the connection P to T. The check valve (6) closes theFunction, sectionconnection from P to B. The pilot poppet (11) is now, due to the areadifferential between the spool and seat, held open by the actuatorpressure in port the pump flow from P to T to P to to the area differential of approx.

5 17% (10%) the effective forceon spool (8) is correspondingly larger, so that the actuator pressurein port B must first fall by this amount, before the compression spring(12) can push the pilot poppet (11) onto its seat. Due to this, on thespring loaded side of the main spool (5), the Pressure increases, themain spool closes supported by the compression spring (13), theconnection P to T and the pump again delivers via the check valve (6)into the hydraulic system (P to B). Pressure cut-off valve type DA 6 VAWith this type of valve the pump is not connected to P but to A. Thevalve delivers the pump flow from A to P to A to switching sequence is the same as with valve type DA 6 VP.(This valve variant is used for simple interconnection with standardmanifolds).Type DA 6 DA 6 26 404 26 404 6 V10864201020301086420102030 GeneralInstallationOptionalAmbient temperature range C 30 to + 80 (NBR seals) 20 to + 80 (FKM seals)WeightManifold operating Pressure at ports B (P)bar315 (after switching P to T, A to T)Maximum flowL/min30 Pressure fluidMineral oil (HL, HLP) to DIN 51 524 1);Fast bio-degradable Pressure fluids toVDMA 24 568 (also see RE 90 221); HETG (rape seed oil) 1);HEPG (polyglycols) 2); HEES (synthetic ester) 2);Other Pressure fluids on requestPressure fluid temperature range C 30 to + 80 (NBR seals) 20 to + 80 (FKM seals)Viscosity rangemm2/s10 to 800 Cleanliness class to ISO codeMaximum permissible degree of contamination of the pressurefluid is to ISO 4406 (C) class 20/18/15 3)Switching differential%10.

6 17 (see characteristic curves on page 5)Technical data (for applications outside these parameters, please consult us!)1)Suitable for NBR and FKM seals2)Only suitable for FKM seals3)The cleanliness class stated for the components must be adhered too in hydraulic systems. Effective filtrationprevents faults from occurring and at the same time increases the component service the selection of filters see catalogue sheets RE 50 070, RE 50 076 and RE 50 in L/min p-qV-characteristic curves over the check valveFlow in L/min Type DA 6 VA (A to P)Type DA 6 VP (P to B) Pressure differential in bar Pressure differential in bar Characteristic curves (measured with HLP46, oil = 40 C 5 C)DA 6 V5/8RE 26 404 210140180242016128200220260300320240280 Type DA 6 VP (P to T) Pressure differential p = f (qV)Flow in L/min Type DA 6 VA (A to T) Pressure differential p = f (qV)Flow in L/min Example spread at a switching Pressure differential of.

7 17% 10% Pressure stage 50 barSwitching Pressure differential in % cut-off Pressure in bar Pressure differential in bar Pressure differential in bar Pressure stage 100 barSwitching Pressure differential in % cut-off Pressure in bar Pressure stage 200 barSwitching Pressure differential in % cut-off Pressure in bar Pressure stage 315 barSwitching Pressure differential in % cut-off Pressure in bar Characteristic curves (measured with HLP46, oil = 40 C 5 C)RE 26 404 6 V0,01/100mmR 4max 30 ABPT4 3527335640,5454 x 5,55136,5 (34)719234685 31171130382901821860 3231,750,751010 Porting pattern to ISO 4401 andCETOP RP 121 H with locating pinholeSubplates(without locating pin hole)G 341/01 (G 1/4)G 342/01 (G 3/8)G 502/01 (G 1/2)(with locating pin hole) G 341/60 (G 1/4)G 342/60 (G 3/8)G 502/60 (G 1/2)to catalogue sheet RE 45 052 andValve fixing screwsM5 x 60 DIN , MA = Nm,must be ordered plate2 Dim.

8 () type DA 6 element "1"4 Adjustment element "2"5 Adjustment element "3"6 Adjustment element "7"7 Identical sealsfor ports A, B, P, T8 Space required to remove the key9 Porting pattern to DIN 24 340 Form A,without locating pin holeUnit dimensions: for manifold mounting (dimensions in mm)Type DA 6 DA 6 surface finish of themating pieceDA 6 V7/8RE 26 404 32 303331156914 1)XX 28 19H8M22 x 1,5 23,8+0,1A 0,05 A45 15 2,4+0,31721,5 2)23,5-0,332,5 1)43 2)45,5-0,354 1)65 2)Y 17H8 15H8 YYYXX35 3)57 3)67,4 0,275 3) 0,05 A73P 5)1030 30 30 35274T 5)X 4)Y 4)Unit dimensions: cartridge valve (dimensions in mm)3 Adjustment element "1"4 Adjustment element "2"5 Adjustment element "3"6 Adjustment element "7"8 Space required to remove the key9 Seal rings10 Connection holes can be positioned atwill about the circumferenceCavityto ISO 77891)Min.

9 Dimension2)Max. dimension3)Depth of fit4)At least 4 mm5)At least 7 mm=X=YRZ8RZ 16 Type DA 6 26 404 6 VBosch Rexroth AGIndustrial HydraulicsD-97813 Lohr am MainZum Eisengie er 1 D-97816 Lohr am MainTelefon 0 93 52 / 18-0 Telefax 0 93 52 / 18-23 58 Telex 6 89 data specified above only serves to describethe product. No statements concerning a certaincondition or suitability for a certain applicationcan be derived from our details stated do not release you from theresponsibility for carrying out your ownassessment and verification. It must beremembered that our products are subject to anatural process of wear and Rexroth LimitedCromwell Road, St Neots,Cambs, PE19 2 ESTel: 0 14 80/22 32 56 Fax: 0 14 80/21 90 52E-mail: system with accumulatorHydraulic system with high and low Pressure pumpsCircuit examples: type DA 6 pressurepumpLow pressurepump Attention!

10 With high and low Pressure applications the selection of thepressure stage for the DA 6 Pressure cut-off valve is dependenton the maximum high Pressure , the next highest Pressure stagehas to be selected!Example: cut-off pressurepmin = 60 barHigh pressurepmax = 200 barresults in the selection of the following Pressure cut-off valve:Type DA 6