Scavenging and Pressure Relief Valve Block SDVB Control Elements of the A4VSG and A2P RE 95533/03.96 Replaces 01.82 The scavenging and pressure relief valve block serves to maintain the feed pressure, to exhaust excess oil and to limit the operating pressure in a closed hydraulic circuit. Both service ports A and B can be pressurised with high or low pressure as required. The high pressure controlled scavenging spools ensure that upon changeover of the gigh and low pressure sides the scavenging valve is connected to the low pressure side. Pilot operation of the double acting pressure relief valves allows simple setting, with minimum force, of the required pressure value for both pressure sides of the circuit. These settings may be carried out independent of one another. On sizes 30 and 50, remote control is also possible via external pilot oil connections (X and ). When the relief valves are actuated, oil flows from the high pressure to the low pressure side. The set pressure value corresponds to the pressure drop between high and low pressure side. This valve type is extremely compact in relation to its flow capacity. The SDVB can also be used as a double-acting pressure relief valve. When used as a relief valve, the supply line to the scavenging valve is closed. By means of independently or direct mounted unloading valves, the pilot valves can be connected externally with the tank or internally with the low pressure side. With this function the SDVB 30 and 50 can serve as a bypass valve. For high dynamic swivel operations with flushing and pressure relief valve block SDVB, when changing the high pressure side there will be free flow between A and B for a short time. Direct operated valve blocks are suitable for this application and are available in sizes 16 and 30 on request. Brueninghaus Hydromatik 1
Ordering code Description scavenging and pressure relief valve block piloted Size size 16 size 30 size 50 SDVB / SDVB 16 30 50 Model (see unit dimensions) without direct operated flushing valve with direct operated flushing valve with direct operated flushing valve without pre-load valve without pre-load valve without pre-load valve N S T* without direct operated flushing valve with pre-load valve V with direct operated flushing valve with pre-load valve W with direct operated flushing valve with pre-load valve Z* * Model T and Z only for SDVB 16 (in prep.) and SDVB 30 Control type pilot oil pilot oil unloading supply drain with/ without internal internal internal external external internal external external internal external (de-energised when closed) internal internal with external pilot ports X- (plugged) internal external (de-energised when open) 1 ) both solenoids must be operated simultaneously 1 2 3 4 5 1 ) 6 7 1 ) Model of port plate port plate M 33 port plate M 42 port plate M 48 port plate SAE 1 1/2" without port plate A B C D N Series Symbols for control type 5 de-energised when closed A open 20 B 30 SDVB 16 SDVB 30/50 Voltages types for control type 5 12 V DC voltage - A closed 24 V DC voltage - B open 110-R AC voltage 220-R AC voltage 220-50 AC voltage 1 2 3 4 5 2 Brueninghaus Hydromatik
Construction SDVB 16 pre-load valve if A4VSG mounted SDVB 30 pre-load valve if A4VSG and A2P directly mounted SDVB 50 pre-load valve if A4VSG and A2P directly mounted Brueninghaus Hydromatik 3
Control type (with pre-load valve) Control Type 1 Control Type 2 K1 K 1 MB MA MB MA Control Type 3 Control Type 4 K1 K1 MB M A MB M A X A X A X B X B Control Type 5 Control Type 6 Control Type 7 K1 K1 K1 M B MA MB M A M B MA X A X B The types of control shown only apply to size 16. With the SDVB 30 and 50 there are two X and two ports. Control types for size 30 are same as those for sizes 16 and 50 but without gauge ports MA and MB. 4 Brueninghaus Hydromatik
Technical data (partly to VDI 3276) Design: combined scavenging and pressure relief valves controlled by operating pressure Mounting: flange model with O-ring seal (4 fixing holes in housing) Pipe connections and connection sizes: see Unit Dimensions Weight (kg) Size 16 30 50 without subplate 6,5 23 61 with subplate 30 68 Mounting position: optional Direction of flow: from A to B resp. B to A and from A to K 1 resp. B to K 1 Pressure setting range: Operating pressure: p v min p v max = 50 400 bar Scavenging pressure at nominal flow Q NSp : SDVB 16, 30 and 50 are infinitely adjustable. Please state the required pressure setting for operating pressure and scavenging pressure when ordering. More details see RE 92100. Fluid temperature range ϑ m min ϑ m max = 20 C +80 C Viscosity range ν min ν max = 10 1000 mm 2 /s Nominal flow Size 16 30 50 Main circuit Q N (L/min) 200 600 1200 Scavenging circuit Q NSp (L/min) 40 100 200 Operating pressure range: p N = 0 400 bar The pressure measured at port X A/B is only identical to the pressure in the service line as long as the pressure relief valve is not actuated. Once the pilot valve has begun to open, the operating pressure in the main line can be around 15% higher. It is therefore recommended to measure the operating pressure direct at M A or M B resp. A or B. p-q-characteristics Operating pressure p = f (Q) Scavenging pressure p Sp = f (Q Sp ) Operating pressure p (bar) Pressure differential p (bar) Size 16 Size 30 Size 50 Size 16 Size 16 Flow Q (L/min) Size 30 50 Size 30 Flow Q (L/min) Size 50 Pressure setting (Operating pressure) Size 16 30 50 p (bar/umdr.) approx. 150 105 105 Brueninghaus Hydromatik 5
SDVB 16 Low pressure p Sp (bar) Switching pressure In order to switch both sides of the circuit A and B to the scavenging valve, a pressure differential between the high pressure and low pressure sides is required. This pressure differential and therefore the switching pressure on the high pressure side is dependent on the setting on the low pressure side. With the SDVB 30 and 50, the spring force effect must also be taken into consideration, since this requires a pressure increase of around 9 bar until the valve poppet is fully open (see diagrams on left). SDVB 30 and 50 Low pressure p Sp (bar) p HD (bar) Cracking pressure Spring force effect Max. pilot oil volume Q St max (taken from main circuit) Size 16 30 50 Q St max (L/min) 4 5 6 Remote control To allow the setting of different pressure values for the pressure relief valves, external pilot oil connections "X" and "" are provided for remote control. Functional variations The SDVB 16 to 50 may also be used as a double acting pressure relief valve. If only the double acting pressure relief valve function is required, the supply line to the scavenging valve is closed or the pressure setting of the scavenging valve is set higher than that on the relevant low pressure side. p HD (bar) Co-ordination with axial piston units Direct mounting SDVB Axial piston unit A4VSG A2P, Series 5 40 71 125 180 250 355 500 750 1000 250 355 500 1000 16 30 50 6 Brueninghaus Hydromatik
Before finalising your design, please request a certified drawing. Subject to revision. Unit Dimensions Size 16 Control Type 1 44.5 209 O-Ring 22x3 A/B Z 85 12 80 129 38.5 ø16 M10 ø34 89 Pressure relief valve A Pressure relief valve B M22x1.5 Model V 12 67 Model W Control Type 2; 3; 4; 6 50 100 10 XB 11 1.5 (XB) Control Type 5; 7 221 10 View Z 87 43.5 B C 112 90 50 E D A 22.5 7.5 32.5 65 O-Ring 19x2 Section C-D Plug DIN 43650-AF2-Pg 11 is not included in supply (see RE 08000) ø9.5 70 Brueninghaus Hydromatik 7
Before finalising your design, please request a certified drawing. Subject to revision. Unit Dimensions Size 30 148 Model N (V) Control Type 1 263 51 B A O-Ring 39x3 A/B 173 Model T (Z) 76 125 Z ø30 Model S (W) 51 Pressure relief valve A Pressure relief valve B M16 24 62 137.5 Control Type 2; 3; 4; 6 225 XB 26 B 60 60 / XB/B Control Type 5; 7 225 XB 26 B 60 194 Plug DIN 43650-AF2-Pg 11 is not included in supply (see RE 08000) View Z D 51 33.5 C Section A-B Section C-D pre-load valve 35 54 110 19 ø34 140 M22x2 M33x2 8.3 ø16 8 Brueninghaus Hydromatik
Before finalising your design, please request a certified drawing. Subject to revision. Unit Dimensions Size 50 Control Type 1 188.5 A 378 142 77 71 40 40 B O-Ring 57x4 A/B 80 51 216 Model N (V) MA/MB 96 142 Z 91 ø50 97 Pressure relief valve A 71 Pressure relief valve B M24 32 92 178 Model S (W) Control Type 2; 3; 4; 6 320 XB 26 B 80 80 / XB/B Control Type 5; 7 320 XB 26 B 80 214 Plug DIN 43650-AF2-Pg 11 is not included in supply (see RE 08000) View Z B MB MA A Section A-B Section C-D pre-load valve 40 40 90 55 20 C M42x2 ø58 186 D E 185 21 M48x2 ø65 ø29 O-Ring 50.47x2.62 Brueninghaus Hydromatik 9
Before finalising your design, please request a certified drawing. Subject to revision. Subplate SDVB 16 (M33x2) SDVB 16 (M42x2) 164 150 164 150 40 46 92 78 7 92 78 60 7 64 ø16 ø9 ø16 17 18 ø9 ø47 M33x2 35 27 20 ø58 M42x2 45 SDVB 30 SDVB 50 20.5 20 20 122 72 ø140 ø24 ø30 22 50 45 96.8 224 22.25 22.25 62 62 ø50 M20 M48x2 ø56 ø14 ø50 0 ø14 10 Brueninghaus Hydromatik
Before finalising your design, please request a certified drawing. Subject to revision. Unit Dimensions A4VSG with scavenging block SDVB 16 2 Unit Dimensions Ports Size A 1 A 2 A 3 M A, M B M SP K 1 40 174 144 approx. 364 M14x1,5 M14x1,5 M22x1,5; 14 deep 71 177 166 389 M14x1,5 M14x1,5 M22x1,5; 14 deep 125 196,5 203 442 M14x1,5 M14x1,5 M22x1,5; 14 deep 180 196,5 203 442 M14x1,5 M14x1,5 M22x1,5; 14 deep 250 317 248 448 M14x1,5 M22x1,5 M33x2; 18 deep 355 319 248 455 M14x1,5 M22x1,5 M33x2; 18 deep 500 353 279 487 M14x1,5 M22x1,5 M33x2; 18 deep Brueninghaus Hydromatik 11
Bosch Rexroth AG Mobile Hydraulics Product Segment Axial Piston Units Plant Horb An den Kelterwiesen 14 72160 Horb, Germany Telefon +49 (0) 74 51 92-0 Telefax +49 (0) 74 51 82 21 info.brm-ak@boschrexroth.de www.boschrexroth.com/bri 2003 by Bosch Rexroth AG, Mobile Hydraulics, 89275 Elchingen 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 any means, without the prior written authorization of Bosch Rexroth AG. In the event of contravention of the above provisions, the contravening party is obliged to pay compensation. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The given information does not release the user from the obligation of own judgement and verification. It must be remembered that our products are subject to a natural process of wear and aging. 12 Brueninghaus Hydromatik