400−P−466101−E - BUCHER HYDRAULICS

Modular−mounting Check Valve, 6 mmPilot−operatedSeries SREZ ... 350 bar, 60 l/min, Pilot−operated1. DescriptionThese self−piloting modular checkvalves are designed for use in stackingassemblies. They ensure closure of theservice line with near−zero leakage,and therefore block the effects of:a) external forces on the actuator2. Symbols Closure of the service line(s) withnear zero leakageb) various leakages across the directionalvalve.The directional valve used must connectboth service lines A and B to TankT in its middle position (spool type G) toensure that the check valve pilot piston With ISO 4401 / CETOP R35H size 3,NFPA D03, DIN 24 340 A6 interfaceis fully unloaded. its middle position(spool type G) to ensure that the checkvalve pilot piston is fully unloaded. O−rings partially recessed in counterboresensure efective hydraulic sealingat the lower valve interface.P T Valve side B AP T1Valve sideB A P T2Valve sideBA3SREZ−A−6... SREZ−B−6... SREZ−AB−6...3. Main characteristicsDesignationpilot−operated check valveDesigndual poppet / seat constructionMounting methodmodular mounting design (sandwich)SizeISO 4401 size 03 interface, nominal 6 mmWeight kg 1,20Mounting attitudeunrestricted, but see symbol plateFlow directionsee symbolsOperating pressure range in P, A, B and T bar ... 350Cracking pressure (approx.) bar 1,3, see ∆p−Q curveArea ratio 1 : 6Flow rate, Qmax l/min 60, see ∆p−Q curvesFluids HL and HLP hydraulic oils to DIN 51 524;for other fluids, please consult BUCHERFluid temperature range C −25 ... +80Ambient temperature C −25 ... +80Viscosity range mm 2 /s (cSt) 10 ... 650, recommended 15 ... 250Minimum fluid cleanliness level 18/14 to ISO 4406 / CETOP RP70H; 8 ... 9 to NAS 1638Replaces: R−18c1/3 Classification: 430.10.66.22Reference: 400−P−466101−E−c/03.04

4. Performance graphsMeasured with oil viscosity 33 mm 2 /s(cSt)→ ∆p (bar)∆p−Q characteristics 10free flow direction9876pilot openreverse flow direction54321no check valve function(blanking plug)10 20 30 40 50 60→ Q (l/min)Cracking pressure approx. 1,3 bar5. DimensionsEnd plug8 A/F int. hex.Tightening torqueMa = 46 ... 54 NmDirectional valve sideBlanking plug,8 A/F int. hex.Tightening torqueMa = 46 ... 54 NmSWISS MADEP T B A251,340SREZ−A−6ø 12,68 966Directional valve sideSWISS MADEP T B ASREZ−B−6SREZ−B−66 9681128 96826,7 40,4ISO 4401 size 3 interface7,5T234631AB32,5ø 5,423PSREZ−AB−6400−P−466101−E−c/03.04 2/3

6. Schematic sectionshowing the relevant portsEx. SREZ−A−62 2Seal kit no. DS−032, comprising:Itm. Qty. Description Size1 4 O−ring no. 012 ∅ 9,25 x 1,78 N902 2 O−ring no. 017 ∅ 17,17 x 1,78 N9017. Installation and servicingAll installation and servicing must becarried out with care, and by qualifiedpersonnel only. At Installation, be sureto mount the valve the correct way up.Do not confuse the flat surface (directionalvalve side) and the surface withO−ring counterbores (actuator side).When changin seals, the new sealsshould by thoroughly oiled or greasedbefore fitting them to the valve. Use thecorrect tightening torque when fit−tingthe end plug and the blanking plug.8. Ordering codeS =R =E =A ... Q =Z =Y ... R =A =B =AB =6 =(Blank) =V =Modular mounting design (sandwich)check valvepilot operatedstandard model per current data sheetstandard model per current data sheetspecial features per arrangementcheck function in Acheck function in Bcheck function in A und BISO 4401 size 3 interface (nominal 6 mm)Nitrile seals (standard)Viton−sealsSpecial seals by arrangement1 ... 9 = design number (omit when ordering new units)z.B. S R E Z − A − 6 − _ −19. Related data sheetsOld no.New no.i−31 400−P−030501−E DIN 24 340 A6 interfaceBUCHER HYDRAULICSGermanyFrancePhone +49 7742 85 20Phone +33 389 64 22 44Fax +49 7742 71 16Fax +33 389 65 28 78info.de@bucherhydraulics.com info.fr@bucherhydraulics.comNetherlandsPhone +31 79 34 26 24 4Fax +31 79 34 26 28 8info.nl@bucherhydraulics.comUKPhone +44 24 76 35 35 61Fax +44 24 76 35 35 72info.uk@bucherhydraulics.comwww.bucherhydraulics.comUSAPhone +1 262 605 82 80Fax +1 262 605 82 78info.wi@bucherhydraulics.comSwitzerlandItalyAustriaChinaProduct Center (Elevator)Phone +41 33 67 26 11 1Fax +41 33 67 26 10 3info.ch@bucherhydraulics.comPhone +39 0522 92 84 11Fax +39 0522 51 32 11info.it@bucherhydraulics.comPhone +43 6216 44 97Fax +43 6216 44 97 4Phone +86 10 64 44 32 88Fax +86 10 64 44 32 35info.bj@bucherhydraulics.comPhone +41 41 757 03 33Fax +41 41 757 16 49info.nh@bucherhydraulics.comWe reserve the right of modification without notice.400−P−466101−E−c/03.04 3/3