Differential Lock Valve Series M..DV (for 2 motors) robust and reliable energy-optimised over the whole flow range simple control compact design offers space-saving installation reliable, uniform motion of the wheel-drives being controlled Description he differential lock valve consists essentially of a bi-directional flow divider (dividing and combining) and a directional valve for optionally bypassing the flow divider. It is intended for use in either open- or closed-loop hydrostatic drives with parallel-connected hydraulic motors. When the lock valve is switched OFF, the inlet flow can divide itself among the mo-tors in any required manner. When the lock valve is switched ON, however, the inlet flow is divided into two pressure compensated portions in accordance with the division ratio of the lock valve. he motors are thus driven at fixed speeds, regardless of their respective loads. his arrangement prevents any hydraulic wheel motor from spinning in conditions of poor traction. balancing orifice can optionally be arranged between the outlets and. his allows some redistribution of flow and prevents un-wanted torque build-up between wheels in these circumstances, and when turning. he differential lock valves can be supplied with either hydraulic, or electrohydraulic, actuation. 2 Symbols 2. Hydraulic actuation 2.2 Electrohydraulic actuation alance orifice can be fitted Issue: 03.207 Reference: 00--000002-EN-3 /8
3 echnical data Hydraulical characteristics Unit Description, value Size 08 Size 6 Nominal flow rate Q max l/min 00 250 Flow range ) 2) l/min 25, 50, 75, 00 20, 60, 200, 250 Operating pressure p max bar 420 ilot pressure p st min. - p st max. bar 0... 30 Viscosity range mm 2 /s 0... 300 Maximum fluid cleanliness ISO 4406, class 2/8/4 (NS 638 class 9); achievable with a filter rating of ß 0 75 Operating fluid temperature range C -20... +80 Division ratio (for others contact ucher Hydraulics) : Fluids Electrical characteristics (type of actuation: EH) Unit Description, value HL/HL mineral oils DIN 5524; other fluids consult ucher Hydraulics Voltage V Direct currant voltage2 or 24 DC ower consumption W 8 Nitrile seals NR Duty cycle 00 ED % mbient temperature C max. +60 Coil temperature C max. +80 (insulation class H) Enclosure protection DIN 40050 Electrical connection Connecting plug to DIN 43650: M Junior imer (2-pole) Deutsch-plug D04-2-E ) State the application's effective nominal flow when ordering 2) Note the minimum flow per section 4.2 I68 4 erformance graphs Measured with viscosity 35 mm 2 /s. 4. Flow resistance 4.. Dividing function switched OFF (in relation to the input Q zu ) 4..2 Dividing function switched ON (in relation to the flow range) p [bar] 20 5 p [bar] 20 Size 08 Size 6 0 5 Size 08 Size 6 0 0 0 50 00 50 200 250 Q zu [l/min] 0 0 25 50 75 00 Q zu [%] 2/8 00--000002-EN-3/03.207
4.2 Division accuracy ercentage of the applicable nominal flow without a balancing orifice between and (hole plugged) [%] 4 3 2 0 - -2-3 -4 Size 6 Size 08 30 40 50 60 70 80 90 00 Q zu [%] 5 Dimensions 5. M08DV (Serie index 3) 5.. Hydraulic actuation M08DV -*H-3*** 5..2 Electrohydraulic actuation M08DV -EH-3G 65,5 0,5 24 58 20 Optional auch als -nschluss verwendbar!! 8 3,5 57 0 9 58 33 84 32,5 42 85,5 20 24 Ø9 40 0,5 3,5 57 0 33 84 Ø 8,5 40 9 82,5 93,5 9 82,5 93,5 32,5 Clearance holes for M8 mounting cap screws to DIN 92 00--000002-EN-3/03.207 3/8
5.2 M6DV (Serie index 3) 5.2. Hydraulic actuation M6DV...-*H-2*** 5.2.2 Electrohydraulic actuation M6DV...-EH-2G 33 30,2 73 7 90 58,6 80 2 56 48,5 83 52,4 52,4 36 8 79 26,2 43 5 30,2 33 73 7 90 58,6 80 2 56 48,5 83 52,4 52,4 Ø8.4 36 8 79 205 26,2 43 8,5 46 8,5 46 Clearance holes for M8 mounting cap screws to DIN 92 5.3 Connection size M08DV ort threads: ort : M27 x 2 orts and : M22 x,5 orts and : M2 x,5 M6DV ort threads: ort : M 33 x 2 alternatively SE (3000 SI) R / 4 orts and : M 27 x 2 alternatively SE (3000 SI) R orts and : M 2 x,5 For SE flanges, see data sheet 00--000049 4/8 00--000002-EN-3/03.207
6 Ordering code Differential lock valve = M..DV Nom. size = 08 or 6 Division : = 0 :,5 etc. 3) = 5 Control flow range per. sect. 3. e. g. 25 l/min = 025 ype of actuation hydraulic = *H electro-hydraulic = EH Design no. Coil voltage DC 2Volt = G2 DC 24Volt = G24 with actuation type *H = *** Options (see section 7): with make-up valve = 0 with anti-shock valve = 02 with make-up valve and inch-size port threads = 07 M 0 8 D V 0 0 2 5 - E H -. G 2 / * * D... 4) 3) With unequal division, the larger flow goes to port 4) Size of balancing orifices must be plainly stated (see also sect. 2) e.g. 0.6 / 0.8 /.0 : if balancing orifice D is to be 0.8 mm, then D = 08 7 Options In addition to the standard versions, differential-lock valves can also be equipped with numerous auxiliary functions and combined in customer-specific manifold blocks. In these cases, technical datas and performance graphs may differ from standard. /0 = With make-up valve /02 = With anti-shock valve (pressure-relief+make-up valve) /07 = with make-up valve and inch-size port threads 7. Examples 7.. M..DV../0 With make-up valves S 7..2 M..DV../02 With anti-shock valves (pressure-relief+make-up valves) S 00--000002-EN-3/03.207 5/8
8 pplication example 8. 2-wheel drive 8.2 4-wheel drive 9 Installation Horizontal mounting is recommended. Do not bolt the valve body onto an uneven mounting surface. 0 Fluid Differential lock valves require fluid with a minimum cleanliness level of NS 638, Class 9 or ISO 4406, code 0/8/5. We recommend the use of fluids that contain anti-wear additives for mixed-friction operating conditions. Fluids without appropriate additives can reduce the service life of pumps and motors. he user is responsible for maintaining, and regularly checking the fluid quality. ucher Hydraulics recommends a load capacity of > 30 N/mm2 to rugger DIN 5347-2. Fluid cleanliness class Cleanliness class (RK) onto ISO 4406 and NS 638 Code Number of particles / 00 ml ISO 4406 4 m 6 m 4 m NS 638 23/2/8 8000000 2000000 250000 2 22/20/8 4000000 000000 250000-22/20/7 4000000 000000 30000 22/20/6 4000000 000000 64000-2/9/6 2000000 500000 64000 0 20/8/5 000000 250000 32000 9 9/7/4 500000 30000 6000 8 8/6/3 250000 64000 8000 7 7/5/2 30000 32000 4000 6 6/4/2 64000 6000 4000-6/4/ 64000 6000 2000 5 5/3/0 32000 8000 000 4 4/2/9 6000 4000 500 3 3//8 8000 2000 250 2 6/8 00--000002-EN-3/03.207
2 System augmentation 2. Switch valve for traction drives 2.. USV08 und USV6 series hese valves enable switching from a serial connection, for example drive mode, into a parallel connection using a differential lock valve. For the user, such solutions mean reliable output and fast operating speeds. 2..2 pplication examples Sweepers lack-top pavers Cold milling machines rench rollers Farm sprayers 2..3 Circuit diagram USV08-J2 USV6-0G2 2 3 4 M08DV USV08-J2 2 00--000002-EN-3/03.207 7/8
2..4 echnical data Hydraulical characteristics Unit Description, value Size 08 Size 08 Operating pressure p max bar 420 420 Nominal flow rate l/min 20 60 Dimensions (valve body without solenoid) mm 60x05x30 220x8x85 Ordering information and order number USV08-J2 = 00032930 USV6-0G2 0 00028253 Fluid temperature range C -20... +80 Viscosity range mm 2 /s 0... 300 Maximum fluid cleanliness ISO 4406, class 20/8/5 (NS 638 class 9); achievable with a filter rating of ß 0 75 Nitrile seals ort threads:: USV08 USV6 NR (Nitril-utadien-Kautschuk), 2,, = M27x2, C = M8x,5 = M4x,5 according to DIN EN ISO 9974- - 4,, = M27x2 = M4x,5 = M4x,5 according to DIN EN ISO 9974- Electrical characteristics Unit Description, Value Supply voltage V DC 2 or 24 Supply voltage tolerance 0% Nominal power consumption - version N - version E V DC V DC = 27 W / V C = 25 W V DC = 7 W / V C = 7 W Switching time Version E (7W): 25 70 (energising) 5 50 (deenergising) Version N : (27/25W): 25 00 (energising 20 70 (deenergising) hese times are strongly influenced by fluid pressure, flow rate and viscosity, as well as by the dwell time under pressure. Relative duty cycle 00% rotection class to EN 60 529 I68 (when connector plugs are properly fitted) Electrical connection 3-pin square plug to ISO 4400 / DIN 43 650 (standard), Deutsch-plug D04-2-E, M Junior imer (2-pole) info.kl@bucherhydraulics.com www.bucherhydraulics.com 207 by ucher Hydraulics GmbH, D-7977 Klettgau ll rights reserved. Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. he information does not relieve users from the duty of conducting their own evaluations and tests. ecause the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification: 430.30.336.346.000 8/8 00--000002-EN-3/03.207