Proportional Directional Valve System

Transcription

1 roportional Directional Valve System Sectional Design and Flow Sharing rinciple Reference: EN-3 Stand: /2

2 2/ EN-3/9.216

3 Contents age 1 General Description Advantages Application examples EX-proof model Technical data General technical data ort sizes erformance graphs Control characteristics Secondary pressure relief Make-up valve ressure differential from to ressure differential from A/B to T Circuit diagram (example) Example of control valve block Dimensions Example of control valve block Inlet section End section Manual operator Ordering code Inlet sections End sections Actuator sections Symbols Inlet sections End sections Actuator sections Section configuration Control spool types Combinations of flow rates Conversion factors Fluid Note Fluid cleanliness EN-3/ /2

4 1 General 1.1 Description Our sectional proportional valves regulate the flow rate to the actuator by means of an internal closed-loop control system. The associated, independent section pressure compensators operate on the principle of proportional flow-sharing. The integral auxiliary functions and high power density make the LVS18 not only a highly adaptable modular valve, but also a very compact one. LVS18 valve blocks can be configured for both fixed- and variable-displacement pumps. The basic LVS18 valve block has 4 control options: hand lever, hydraulic, electrohydraulic proportional, or with onboard electronics. Unlike conventional load-sensing valves, with the proportional flow-sharing principle of the LVS18 valve, the load signal is fed directly to the variable-displacement pump or system pressure-control valve i.e. without using a series of shuttle valves. The highly adaptable modular system consists of an inlet section, actuator sections (with up to eight sections) and an end section. Specifically designed for use in mobile hydraulics, it provides the machine manufacturer with the ideal configuration for every application. 1.2 Advantages Safe volumetric flow control by flow sharing principle, ptevents the functional hold-up caused by undersupply. Load-independent flow control, even with parallel operation of several actuators Load feedback Actuator sections with individual pressure compensators Secondary pressure relief valves LS pressure relief for the whole control block With rapid-traverse and floating position Energy saving by low pressure drop 1.3 Application examples Mobile cranes Ground drilling rigs Container forklifts Excavators Wheel loaders Telehandlers 1.4 EX-proof model Our LVS18 proportional directional valve system is suitable for use in applications with EX-proof requirements (in a special version, on application) 2 Technical data 2.1 General technical data General characteristics Unit Description, value Design roportional valves, sectional design, max. 8 sections Types of operator electrohydraulic, proportional hydraulic manual (oil-tight enclosure) electrohydraulic proportional - manual, combined electrohydraulic proportional - hydraulic, combined onboard electronics for other types, please contact Bucher ort types threaded ports to DIN 3852 and DIN ISO 6162 SAE flange threaded ports to UN/UNF Mounting attitude unrestricted, but preferably with automatic air-bleeding Ambient temperature range C / EN-3/9.216

5 Hydraulic characteristics Unit Description, value Hydraulic fluid HL and HL mineral oil to DIN 51524; for other fluids please contact BUCHER HYDRAULICS GmbH Hydraulic fluid temperature range C -2 +8, recommended Viscosity range mm 2 / s [cst] 1 38, recommended 15 1 Minimum fluid cleanliness level NAS 1638, class 9 or ISO 446, code 2/18/15 Maximum inlet flow rate l/min 4 Maximum actuator flow rate l/min Q max = 26 ermissible range of pressure differential between bar 8 25 (Q max = 26 l/min) port on valve block and LS max. Maximum pump pressure bar 37 Maximum load pressure bar 42 Maximum tank pressure, port T bar 5 Maximum tank pressure for electrohydraulic pilot stage bar 5 (port Y or T) Hydraulic operation Unit Description, value ilot-pressure range bar 6 2 (can differ with rapid traverse and float) Maximum pressure rating of pilot circuit bar 5 Electrical characteristics Unit Description, value Control current at opening point Control current at max. stroke Hysteresis with 1 Hz WM signal (from control current at max. stroke) rotection class to EN Insulation class to VDE V 12 V 24 V 12 V ma 35 7 (can differ with rapid traverse and float) ma 7 14 (can differ with rapid traverse and float) ± 3 % I 65 Supply voltage V DC 24 / 12 Coil resistance at 2 C Coil resistance at 6 C 24 V 12 V 24 V 12 V ower consumption at max. spool stroke (coil resistance at 6 C) H 21.2 ± 5 % 5.3 ± 5 % VA ± 5 % 6.1 ± 5 % 2.2 ort sizes Type Threaded ports DIN 3852 SAE flanged ports (on application) UN/UNF Actuator G 1 ¾ 6 SI 1-5/16-12 ump G 1¼ 1 6 SI 1-5/8-12 Tank G 1½ 1¼ 3 SI 1-7/8-12 Load sensing G ¼ G ¼ 9/16-18 ump for pilot stage G ¼ G ¼ 9/ EN-3/ /2

6 Type Threaded ports DIN 3852 SAE flanged ports (on application) UN/UNF Tank for pilot stage Y G ¼ G ¼ 9/16-18 Test point for pump pressure M G ¼ G ¼ 9/16-18 Test point for a2/b2 G ¼ G ¼ 7/ erformance graphs 3.1 Control characteristics Flow rate 1,% 9,% 8,% 7,% 6,% 5,% 4,% 3,% 2,% 1,%,% Δp [bar] 2 Control current [ma] 3.2 Secondary pressure relief 3.4 ressure differential from to Measured with main spool (26 l/min type) at max. stroke ressure differential Δp - [bar] Flow rate Q -A/B [l/min] 3.5 ressure differential from A/B to T ressure differential Δp A/B-T [bar] ressure differential Δp A/B-T [bar] Flow rate Q A/B-T [l/min] Flow rate Q A/B-T [l/min] 3.3 Make-up valve 1 Spool type C in neutral position 2 Spool type A at 1% energisation 3 Spool type C at 1% energisation ressure differential Δp T-A/B [bar] 12, 1, 8, 6, 4, 2, Flow rate Q T-A/B [l/min] 24 6/ EN-3/9.216

7 4 Circuit diagram (example) 4.1 Example of control valve block X1 Y X T b2 a1 b1 a1 b1 DUE7 DUE8 a b DUE7 DUE8 a b a2 DUE7 DUE8 a b b2 D1 32bar DUE1 DUE2 28bar FI D4 G1 G2 DUE DA DB DA DB 23bar 8bar 26bar M A A 26/16 B A C 21/21 B A C 7/3 B LVS18-MG X--X--A LVS18-Y1GA--A26/16-E24AX-X-HL-K23/K8-A-Z LVS18-GA--C21/21-E24AX-X-XX-X/X-A LVS18-GA-1-C7/3-XXX-Y-XX-S/K26-A LVS18-EXX-X-XXXX-A Option Z = control pressure tapped from A side Flow rates generally refer to a Δp (pump - LS) = 12 bar EN-3/ /2

8 5 Dimensions 5.1 Example of control valve block ca.216 ca ca ca ca X1 24 b1 a1 b1 a b2 a M1 x B A T Y X FI b2 -B 23 -A M1 x / EN-3/9.216

9 5.2 Inlet section LVS18-MG X--X--A M1x17 X Inlet sections on application LVS18-GG-28-1X--X--A LVS18-MG X--X-1-A LVS18-MF X-3545-X--A D4 11 T Y DUE1 M DUE2 45 X FI D1 M1 x End section LVS18-EXX-X-XXX-A 5.4 Manual operator Hand lever in position A M6 23 -A B ca ca Without hand lever = Z M6 23 -A -B End section on application LVS18-EGX-11X-XXXX-A 1 5 ca Hand lever in position L -A 23 -B ca M ca ca EN-3/ /2

10 6 Ordering code 6.1 Inlet sections LVS 18 - M- G X X A - Z LVS = Valve series 18 = Nominal size Section types D = 2-way pressure compensator G = connection section without system pressure relief M = conn. sect. with control function (apart from 3-way compensator = priority section V = 3-way pressure compensator + system pressure relief W = adaptor section ort type G = threaded ports to DIN 3852 F = SAE flanges U = UN/UNF threads System pressure relief 33 = system pressure relief D1 ( with section type G) Load-pressure relief 28 = load-pressure relief D4 ilot oil supply X = internal 1 = external ilot oil drain Y = internal 1 = external X = Not assigned ilot-pressure reduction D2 [bar]: 35 = standard = when not provided ilot-pressure reduction D3 [bar]: 45 = standard = when not provided ilot-pressure shut-off (valve V1): = without shut-off 1 = with shut-off ilot-pressure shut-off (valve V1): = without shut-off 1 = with shut-off X = Not assigned LS unloading (filter, 2x orifice, DUE2) = with 1 = without ressure-peak reducing valve = without 1 = V5 with > 5 l A = Series design stage = Option (to be filled in by the factory) 1/ EN-3/9.216

11 6.2 End sections LVS 18 - E G X - X - XX XX - A -. LVS = Valve series 18 = Nominal size Section types E = end section ort types, and T G = threaded ports to DIN 3852 and DIN ISO 6162 F = SAE flanges U = UN/UNF threads X = not provided X = Not assigned ort = plugged, or no port 1 open ort T = plugged, or no T port 1 open X = Not assigned XX = Not assigned XX = Not assigned A = Series design stage = Option (to be filled in by the factory) EN-3/ /2

12 6.3 Actuator sections Ordering code - part 1 LVS 18 - Y 3 G A - - C 2 / 15 - E 24 A - LVS = Valve series 18 = Nominal size Section types Y 3 = actuator section Actuator section number (max. 8) ort types G = threaded ports to DIN 3852 F = SAE flanges U = UN / UNF threads Body design A = standard C = float/rapid traverse Body design = standard 1 = for OBE Check valve = without 1 = with check valve C = Spool type (see section 7.5) 2 = Flow rate Q A in l/min, A side 15 = Flow rate Q B in l/min, B side Electrical operation E = with electrical operation X = when not provided Supply voltage = without electrical operation 12 = 12 V DC 24 = 24 V DC (standard) Connection type A = AM Junior Timer D = Deutsch DT4-2 B = Deutsch DT4-6 (OBE) K = cable (ex-proof) X = when not provided see ordering code part 2 12/ EN-3/9.216

13 6.3.2 Ordering code - part 2 See ordering code part 1 X - Y - H L - D 35 / K 2 - A - Z Manual override = without manual override 1 = with manual override (only in conjunction with electrical operation E) Not assigned Hydraulic operation Y = hydraulic operation X = not provided Manual operation H = manual operation X = not provided Hand-lever position A = hand-lever position A L = hand-lever position L Z = without hand-lever X = not provided ressure relief / make-up, secondary, in bar, A side N = make-up K = combination pressure relief and make-up S = closure plug X = not provided 35 = ressure setting [bar], secondary, A side (S,N = ) ressure relief / make-up, secondary, in bar, B side N = make-up K = combination pressure relief and make-up S = closure plug X = not provided 2 = ressure setting [bar], secondary, B side (S,N = ) Series design stage Special model EN-3/ /2

14 EN-3/ /2 7 Symbols 7.1 Inlet sections LVS18-MG X--X--A 1 1 Y X T M G2 G1 DUE3 X1 D4 FI DUE2 28bar D1 32bar DUE LVS18-GG-28-1X--X--A DUE3 1 1 Y X T G2 G1 D4 FI DUE2 28bar M LVS18-MG X--X-1-A 1 1 Y X T M G2 G1 DUE3 X1 D4 FI DUE2 28bar D1 32bar DUE LVS18-DG-28-X--X--A M Y X T D4 DUE2 28bar FI 1 1 DUE3 G2 G1

15 7.1.5 LVS18-MG X-3545-X--A LVS18-VG-28--1X--X--A D1 32bar D4 28bar DUE1 X1 X 45bar DUE2 DUE2 28bar D2 D3 FI Y T 35bar DUE G2 FI D4 DUE3 1 1 Y X T G1 G2 DUE3 1 1 M M 7.2 End sections LVS18-EXX-X-XXXX-A LVS18-EGX-11X-XXXX-A E TE EN-3/ /2

16 7.3 Actuator sections Type of operator Electrohydraulic proportional = E Hydraulic = Y Manual = H Electrohydraulic proportional and manual = E + H Electrohydraulic proportional with onboard electronics = E24B s 16/ EN-3/9.216

17 7.4 Section configuration Optional: With check valve (load-holding valve) 1 1 DA DB A B Secondary valve Standard: with no installation options Optional: K = Combination pressure relief and make-up valve N = Make-up valve S = lug EN-3/ /2

18 7.5 Control spool types Standard: Rapid-traverse position A R B C * on application T D * on application Float position U * on application S * on application 18/ EN-3/9.216

19 7.6 Combinations of flow rates referred flow-rate combinations with the standard pressure differential of 12 bar between the port on the valve block and LS max [l/min]. Q A /Q B Q A /Q B Q A /Q B Q A /Q B Q A /Q B Q A /Q B 26/26 21/21 16/16 11/11 7/7 3/3 26/21 21/11 16/11 11/7 7/3 26/16 16/7 26/11 For other combinations, contact Bucher Hydraulics 7.7 Conversion factors While holding a constant spool position, the flow rate at the actuator ports can be varied by varying the Δp setting (pump LS) at the compensator or pump controller. The corresponding conversion factors are shown in the following table. If this facility is used, the actuator flow rate must be limited to a maximum of 26 l/min. LS Δp Conversion factor 8 bar,8 1 bar,9 12 bar 1, 14 bar 1,5 16 bar 1,15 18 bar 1,25 2 bar 1,3 25 bar 1,45 8 Fluid The oil for the proportional valves must have a minimum cleanliness level of 2/18/15 to ISO 446 or class 9 to NAS We recommend the use of fluids that contain anti-wear additives for operation with boundary lubrication. Fluids without appropriate additives reduce the service life of valves. The user is responsible for maintaining, and regularly checking, the fluid quality. Bucher Hydraulics recommends a Brugger EN/DIN load capacity > 3 N/mm 2. 9 Note This catalogue is intended for users with specialist knowledge. The user must check the suitability of the equipment described herein in order to ensure that all of the conditions necessary for the safety and proper functioning of the system are fulfilled. If you have any doubts or questions concerning the use of these valves, please consult Bucher Hydraulics. 1 Fluid cleanliness Cleanliness class to ISO 446 and NAS 1638 Code ISO 446 Number of particles / 1 ml 4 m 6 m 14 m NAS /21/ /2/ /2/ /2/ /19/ /18/ /17/ /16/ /15/ /14/ /14/ /13/ EN-3/ /2

20 by Bucher Hydraulics Remscheid GmbH, D Remscheid Alle Rechte vorbehalten. Die angegebenen Daten dienen allein der roduktbeschreibung und sind nicht als zugesicherte Eigenschaften im rechtlichen Sinne zu verstehen. Die Angaben entbinden den Anwender nicht von eigenen Beurteilungen und rüfungen. Auf Grund kontinuierlicher Verbesserungen der rodukte, sind Änderungen der in diesem Katalog gemachten roduktspezifikationen vorbehalten. Classification: / EN-3/9.216