Check valve hydraulically pilot operated

Transcription

1 Check valve hydraulically pilot operated RE 6/7.5 Replaces:. / Types SV and SL Nominal sizes to Component series X Maximum operating pressure 5 bar Maximum flow 55 l/min H555 Overview of contents Contents Page Features Ordering details Preferred types Symbols Function, section Technical data Characteristic curves 5, 6 Unit dimensions 7, Features For subplate mounting Connection location to ISO 57 Subplates to data sheet RE 56 (separate order) For threaded connections With internal or external pilot oil drain, optional With or without decompression feature, optional Version with decompression feature for dampened decompression (minimising possible pressure shocks) opening pressures, optional Information on available spare parts:

2 / Bosch Rexroth G Hydraulics SV; SL RE 6/7.5 Ordering details S X * Internal pilot oil drain = V External pilot oil drain = L Type SV Type SL Connection type G P G P Ordering details Nom. size = = = = Nom. size 6 = 5 = 5 Nom. size = = = = Nom. size 5 = 5 = 5 Nom. size = = = = For subplate mounting For threaded connections With decompression feature Without decompression feature = P = G = = B Further details in clear text Seal material No code = NBR seals V = FKM seals ttention! The compatibility of the seals and pressure fluid used has to be taken into account! X = Component series to 9 ( to 9: unchanged installation and connection dimensions) Opening pressure = = See Δp-q V -characteristic curves = to B, = Pages 5 and 6 Preferred types Type SL Material No. Type SV Material No. SL G-X/ R97 SV G-X/ R96 SL GB-X/ R955 SV GB-X/ R955 SL P-X/ R97 SV P-X/ R969 SL PB-X/ R99 SV PB-X/ R9677 SL 5 G-X/ R95755 SV 5 G-X/ R95759 SL P-X/ R SV G-X/ R95755 SL PB-X/ R SV P-X/ R SL 5 G-X/ R SV 5 G-X/ R95755 SL G-X/ R SV G-X/ R95755 SL P-X/ R95756 SV P-X/ R95755 Further preferred types and standard units can be found within the EPS (Standard Price List). Symbols Version SV (internal pilot oil drain) B Version SL (external pilot oil drain) B X X

3 RE 6/7.5 SV; SL Hydraulics Bosch Rexroth G / Function, section The SV and SL valves are hydraulic pilot operated check valves of poppet type design which may be opened to permit flow in the reverse direction. These valves are used for the isolation of operating circuits which are under pressure, i.e. as a safe guard against the lowering of a load when a line break occurs or against creeping movements of hydraulically locked actuators. The valve basically comprises of the housing (), the poppet (), a compression spring (), the control spool () as well as an optional decompression feature as a ball poppet valve (5). Type SV The valve permits free-flow from to B. In the reverse direction, the poppet () is held firmly on to its seat in addition to the spring force by the system pressure. By applying pressure to connection X, the control spool () is moved to the right. This lifts poppet () off its seat. Now the valve also permits free-flow from B to. In order to ensure that the valve opens due to the pressure applied to the control spool (), a certain minimum pilot pressure is required (see page ). Types SV... and SL... (with decompression) This valve is fitted with an additional decompression feature. When pressure is applied to port X, the control spool () is moved to the right. This firstly lifts the ball (5.) and then the poppet () off their seats. The valve now permits flow from B to. Because of the decompression feature there is a dampened decompression of the pressurised fluid. Due to this possible pressure shocks are avoided. Type SL... The function of this valve corresponds to that of the type SV. The difference is the external connection. Here, the annular area of the control spool () is separated from the port. Pressure present in port only acts on area (9) of the control spool () ; 5. X B Type SV..P.-X/... (without pilot oil drain, with decompression) rea 7 rea rea 9 rea X B Type SL..PB.-X/... (with pilot oil drain, without decompression)

4 / Bosch Rexroth G Hydraulics SV; SL RE 6/7.5 Technical data (for applications outside these parameters, please consult us!) General Nominal sizes NS NS6 NS NS5 NS Weight Subplate mounting kg Threaded connections kg Installation Optional mbient temperature range C to + (NBR seals) to + (FKM seals) Hydraulic Maximum operating pressure bar 5 Maximum flow l/min See characteristic curves, pages 5 and 6 Control pressure bar 5 to 5 Pressure fluid Pressure fluid temperature range C to + (NBR seals) to + (FKM seals) Viscosity range mm /s. to 5 Mineral oil (HL, HLP) to DIN 55 ) ; fast bio-degradable pressure fluids to VDM 56 (also see RE 9); HETG (rape seed oil) ) ; HEPG (polyglycoles) ) ; HEES (synthetic ester) ) ; other pressure fluids on request Maximum permissible degree of contamination of the pressure fluid. Cleanliness class ISO 6 (c) Flow direction Class //5 ) Free-flow from to B, from B to when opened Control volume Port X cm Port (only type SL) cm Control areas (areas according to sectional drawing, see page ) rea cm rea cm rea cm rea cm ) Suitable for NBR and FKM seals ) Only suitable for FKM seals ) 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 57, RE 576, RE 5, RE 56 and RE 5.

5 RE 6/7.5 SV; SL Hydraulics Bosch Rexroth G 5/ Characteristic curves: subplate mounting (measured with HLP6, ϑ oil = C ± 5 C) Δp-q V -characteristic curves NS NS NS 7,5 5,5 7,5 5,5 to B B to Opening pressure in bar NS NS NS Control pressure-load pressure-characteristic curves Control pressure in bar Without decompression 6 Control pressure in bar With decompression 6 6 Load pressure in bar 6 Load pressure in bar Scatter range Limiting value Valve poppet Decompression

6 6/ Bosch Rexroth G Hydraulics SV; SL RE 6/7.5 Characteristic curves: threaded connections (measured with HLP6, ϑ oil = C ± 5 C) Δp-q V -characteristic curves NS NS5 and NS6 and 7,5 5,5 7,5 5,5 to B B to Opening pressure in bar NS NS6 and NS5 and Control pressure-load pressure-characteristic curves Control pressure in bar Without decompression 6 Control pressure in bar With decompression 6 6 Load pressure in bar 6 Load pressure in bar Scatter range Limiting value Valve poppet Decompression

7 RE 6/7.5 SV; SL Hydraulics Bosch Rexroth G 7/ Unit dimensions: subplate mounting (nominal dimensions in mm),5 H H H L L L 5 6 Ø H B Ø6 L5 L7 L L L6 L9 L Port with valve type "SL" (with valve type "SV" this port is plugged) Name plate Locating pin B B5 B B B B6 Identical seal rings for ports and B for ports X and 5 Valve with opening pressure versions and (dim. L) 6 Valve with opening pressure versions and (dim. L) X 7 6 valve fixing holes for type SV/SL Connection location to ISO 57 7 L L L,/mm Rzmax Type NS L L L L L5 L6 L7 L L9 L L SV SL, 5,5 5,5 7,,9,5 7, 5,,5 5 7,7 7,7 7 6, 7,5, 9,,6 56, 6, 6,,, 9 6,7 67,5,6, 5,5 5,5 7,,9,5 7, 5,,5,5 5 7,7 7,7 7 6, 7,5, 9, 9,5,6 56, 6, 6,,, 9 6,7 67,5 59,5,6 Type NS L L B B B B B5 H H H B6 SV SL Required surface finish of the valve mounting surface, 66,7 5, 5 9 6,,5 79, ,7, 6,7 96, 75 9, 5,5 7,, 66,7 5, 7, ,,5 79, 6 7 6, ,7, 6,7 96, 75 9,, 5,5 7, Subplates NS G 6/ (G/) G 6/ (G/) NS G / (G/) G / (G) NS G / (G /) G 5/ (G /) to data sheet RE 56 (separate order) Valve fixing screws (separate order) NS off ISO 76 - M x NS off ISO 76 - M x NS 6 off ISO 76 - M x (friction value µ ges =.); Tightening torque M = 75 Nm ± % (with changed surfaces please adapt)

8 / Bosch Rexroth G Hydraulics SV; SL RE 6/7.5 Unit dimensions: threaded connections (nominal dimensions in mm) H H,5 L L 5 L 6 Ø H B 7 L5 X L L6 L B L7 L Port for valve type "SL" (for valve type "SV" this port is plugged) Name plate 5 Valve with opening pressure versions and (dim. L) 6 Valve with opening pressure versions and (dim. L) 7 valve fixing holes B Ports L9 7 B Type NS, B X, SV SL G/ 6 G/ G 5 G / G / G/ 6 G/ G 5 G / G / G/ G/ Type NS L L L L L5 L6 L7 L L9 L B B B H H, 5,5 5,5 7, 56,5,5,5,5 7, 7 66,7, SV 6, 7,7 7,7 5 7,5 7 5, , 9,7 6 5, 56, 5,7 5,7, 9 96,, 5,5, 5,5 5,5 7, 56,5,5,5,5 7, 7 66,7, SL 6, 7,7 7,7 5 7,5 7 5, , 9,7 6 5, 56, 5,7 5,7, 9 96,, 5,5 Bosch Rexroth G Hydraulics Zum Eisengießer 976 Lohr am Main, Germany Telefon +9 () 9 5 / - Telefax +9 () 9 5 / - 5 documentation@boschrexroth.de This document, as well as the data, specifications and other informations set forth in it, are the exclusive property of Bosch Rexroth G. 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.