Pilot Operated Pressure Relief Valves with 2 or 3 Pressure Ratings Type DB 3U, Series 5X
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1 ilot Operted ressure Relief Vlves with or ressure Rtings ype D U, Series RE 6/.9 RE 6/.9 Sizes,, Up to r Up to 6 L/min Replces: Specil fetures: Suplte mounting Mounting to DIN form E, Connection pltes to dt sheet RE 6 (seprte order) hreded connection Mnifold mounting djustment elements: Rotry kno, Screw with internl hexgon nd protective cp, Lockle rotry kno with scle, Rotry kno with scle Solenoid operted control vi mounted directionl vlve K 9- Ordering Code ype D UE /..6GNZV D U * ilot operted vlve (complete) = No Code ilot operted vlve: without min spool ssemly = C (Size not stted) with min spool ssemly = C (Stte size or ) Size Mnifold mounted hreded connection " " "G" Ordering Code = = (/" S) = (/" S) = = (" S) = (" S /) = = (" S /) = E = H = D For mnifold mounting = For threded connection = G djustment device: Rotting kno = Socket screw nd protective cp = (lwys t mx. pressure rting) Lockle rotting kno with scle = ) Rotting kno with scle = 7 Series to 9 = ( to 9, externlly interchngele) ressure setting up to r = ressure setting up to r = ressure setting up to r = ressure setting up to r = ressure setting up to r = ) ilot oil supply: Lekge line = Ordering code = to symols = on pge = Further detils in cler text No Code = NR sels, suitle for use with oils (HL, HL) to DIN V = Viton sels, sutle for use with phosphte ester (HFD-R) Electricl connection Z =lug-in connector DIN 6 Z = Lrge plug-in connector ) ZL = Lrge plug-in connector with light No Code = Without emergency op. N = With emergency opertion N9 = With protected emergency op. G = V DC WR = DC solenoid with uilt-in rectifier for C V frequency independent (only for voltges V nd connector Z) W- = C solenoid V-Hz 6 = With stndrd directionl vlve ) 6 = With high performnce directionl vlve (only t pressure setting of up to r) Directionl vlves with solenoids protected from explosions on enquiry No Code = Stndrd model U = Vlve for minimum crcking pressure (not in model without min spool) Model "U" not suitle for cross-line relief ) H key with order no. is supplied. ) For the r model the directionl vlve must e ordered s high performnce vlve "6". ) For further electricl connections see dt sheet RE.
2 RE 6/.9 Functionl description, section ilot operted pressure relief vlves, type D U hve or independently djustle operting pressures. hey siclly comprise min vlve () with min spool () nd three pilot vlves (), (.), (.) with pressure setting elements (), (.) nd (.). Opertion is crried out electriclly y mens of the mounted directionl vlve. Depending on the dir. vlve model there re differences in: Spool pos. (dir. vlve) ressure Vlve type rtings D U.E p mx + zero Zero pressure p mx p mx press. ypss D U.H ypss. p. p D U.D djustment (Item) ressure djustment (Item) p mx p mx. p. p p mx p mx. p. p Wrning! lwys set mximum operting pressure t djustment (). sic principle: he system pressure present in chnnel cts on min spool (). t the sme time, vi control lines (6) nd (7) fitted with orifices () nd (), pressure is present on the spring loded side of min spool () nd ll () of pilot vlve (). his pilot vlve () is independent of the position of the directionl vlve nd is ressure djustment (Item) ressure continuously pressurised y the system pressure. If the pressure increses in chnnel due to the vlue set t spring (9), ll () opens ginst spring (9). he fluid on the spring loded side of min spool () now flows vi control line (7), orifice () nd ll () into spring chmer () nd from there on to the tnk vi control line (). Dependent on orifices () nd () pressure drop is creted t min spool (), so tht the connection from chnnel to chnnel is opened nd fluid flows wy whilst mintining the set operting pressure. ype D U.E ( pressure rtings) oth pilot vlves (.) nd (.) remin t zero pressure when the directionl vlve is t rest. y operting the directionl vlve the connection to one of the pilot vlves (.) or (.) is opened vi control line (9). he rest of the ction is identicl to the sic principle. ilot oil return from the spring chmers is internl vi control lines (7), () nd () or externl vi control line () to tnk. ype D U.H ( pressure rtings nd zero pressure ypss) he pilot vlve is controlled y mens of directionl vlve with H control spool, which only llows pressure rtings t the pilot vlve nd enles free flow in the neutrl position. ressure relief is only possile y mens of pilot vlves (.) nd (.). ype D U.D ( pressure rtings) he pilot vlve is controlled y directionl vlve with D spool. ressure relief is only possile y mens of pilot vlves (.) nd (.). ()
3 Symols Model " " (drin cse port) Model "" RE 6/.9 mx mx Model "" Model "" mx mx E - control spool echnicl dt (For opertion outside these prmeters, plese consult us!) Generl Instlltion position ny Weight D U D U D U D U D U Suplte mounting D U kg,6, 6, DC U kg, DC U or kg, hreded connection D U. G.. kg 7, 7, 7, 7, 6, Size of directionl vlve See dt sheet RE 77 Hydrulic H - control spool Operting pressure, ports,, r Up tp Opposing pressure, port D U.6 (stndrd directionl vlve) r Up to for DC nd up to for C solenoids D U.6 (high performnce dir. vlve) r Up to for DC nd C solenoids D U... (extr solenoid) r Up to 6 for DC solenoids; (electricl dt on enquiry) Setting pressure min. r Q dependent (see operting curves on pge ) mx. r Up to, up to, up to, up to, up to Mx. flow D U D U D U D U D U suplte mounting L/min 6 threded connection L/min 6 Fluid Minerl oils (HL, HL) to DIN ; phosphte ester (HFD-R) Fluid temperture rnge C to + (with NR sels) to + (with Viton sels) Viscosity rnge mm /s to Fluid clenliness Mximum permissile degree of contmintion of fluid to NS Clss 9. We therefore recommend filter with minimum retention rte of β 7. D - control spool
4 RE 6/.9 Operting Curves (mesured t ν = mm /s nd t = C) he operting curves were mesured with n externl, zero pressure pilot oil return. With internl pilot oil return the input pressure is incresed y the output pressure present t port. Minimum setting pressure nd ypss pressure dependent on flow ) Size Minimum pressure t setting "right/left" in r Model "U" Stndrd model he ypss pressure or minimum djustment pressure t the "centre" djustment is out r lower! ) he operting curves re vlid for output pressure p = within complete flow rnge. Flow in L/min Minimum pressure t setting "right/left" in r Size Model "U" Stndrd model Flow in L/min SIze Minimum pressure t setting "right/left" in r Model "U" Stndrd model 6 6 Flow in L/min
5 Operting Curves (mesured t ν = mm /s nd t = C) RE 6/.9 he operting curves were mesured with n externl, zero pressure pilot oil return. With internl pilot oil return the input pressure is incresed y the output pressure present t port. Input pressure dependent on flow 6 Input pressure in r Size Size Size 6 6 Flow in L/min Unit dimensions: Drilling for mnifold mounting (Dimensions in mm) Ø, x 9 ±, Ø Ø H7 Ø, +, Z, Ø, Z 6 ±, x M6, 7,/ mm Ø +, +, +,, View "Z" x M; x mx. R, Z Z 6 Ø 6 M; 6 Ø, +, Ø x y z = = = R mx R Z R Z he di. ore my enter the di. ore t ny position. However, cre must e tken tht port nd the fixing screw holes do not intersect. ck-up ring nd O ring must e fitted into the min ore efore ssemling the min spool. Orifices must e ordered seprtely.
6 RE 6/.9 Unit dimensions: suplte mounting (Dimensions in mm), 9, 7 g g g 9 6; L9 /" G /; S; 9 Ø /" G /; S; Ø 9, (,) 9 (6,) 9 Ø 6 M x ; Ø 6 9 L L L7 L L6 L L L Ø D Required surfce finish of mting piece. 9. Connection pltes to dt sheet RE 6 nd vlve fixing screws must e ordered seprtely. Connection pltes for: D U D U G / (/" S) G / (/" S) G6/ (/" S) G 9/ (" S) D U G / ( /" S) G / ( /" S) Vlve fixing screws for: D U : off M x DIN 9.9; tightening torque = Nm D U : off M x DIN 9.9; tightening torque = Nm D U : off M x DIN 9.9; tightening torque = Nm DC U nd DC U or : off M x DIN 9.9; tightening torque = 7 Nm See pge 7 for position description,/mm R mx 6 ype L L L L L L6 L7 L L9 Ø D R ring R ring orts, ort D U 9,, 7,, 7,, 7, 7,6 x, x,6 9, x, x,7 D U 66,7,,,,6,,, 7, x, x, 9, x, x,7 D U 7,,9,,7 76,,,6, x, x, 9, x, x,7
7 Unit dimensions: hreded connection RE 6/.9 (Dimensions in mm), g 6 /" G /; S; Ø /" G /; S; 9 9,, g (6,) (6,) 9 Ø Ø D Ø D Ø 9, ; 7 g 7 6 D Ø D ype D ØD D U.G /" S D U.G /" S D U.G " S 7 D U.G /" S D U.G /" S 6 ipe threds to ISO / Nmeplte ort for externl pilot oil feed 9 ort for externl pilot oil return djustment element djustment element. djustment (solenoid ""). djustment (solenoid "") 6 djustment element 7 djustment element 7 9 Socket screw /F. Ø 7. 9 Spce required to remove key Fixing pin Vlve fixing ore Directionl vlve size 6 (see RE 77) Solenoid Solenoid "" Connector Z 7 Connector Z nd ZL Dimension for stndrd directionl vlve "6" 9 Dimension for high performnce directionl vlve "6" Spce required to remove connector Solenoid with emergency opertion "N"; optionl Omitted for internl pilot oil return ilot vlve "left/right" Sleeve Directionl vlve with solenoid (D control spool) 7
8 RE 6/.9 Unit dimensions: ilot vlve with (DC U or ) or without (DC U) min spool (Dimensions in mm), 9, 7 g g 6 Ø 9, (,) (,) 9 9 6; 7 g Ø 7, 9 /" G S; /; Ø 9 9, 9 6 Ø,. Drilling for mnifold mounting see pge. 9 Vlve fixing screws see pge , Nmeplte ort for externl pilot oil return djustment element djustment element. djustment (solenoid ""). djustment (solenoid "") 6 djustment element 7 djustment element 7 9 Socket screw /F Spce required to remove key. Vlve fixing ore Dir. vlve size 6 (see RE 77) Solenoid Solenoid "" Connector Z 7 Connectors Z nd ZL Dimension for std directionl vlve "6" 9 Dimension for high performnce directionl vlve "6" Spce required to remove connector Solenoid with emergency opertion "N", optionl ilot vlve "left/right" Sleeve Directionl vlve with solenoid (D control spool) 6 R ring 9, x, x,7 7 Min spool O ring, x,7 9 O ring 7, x, O ring, x,6 ck-up ring 9, x, ck-up ring, x x,7 Mnnesmnn Rexroth GmH D-97 Lohr m Min Jhnstrße - D-97 Lohr m Min elefon 9 / - elefx 9 / - elex 6 9 G.L.Rexroth Ltd., Cromwell Rod, St. Neots, Cmridgeshire, E9 ES. el: 76 Fx: 9 ll rights reserved Suject to revision
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