Differential Lock Valve
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1 Differential Lock Valve Series M..DVD (for 3 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 two bidirectional flow dividers (dividing and combining) and a directional valve for optionally bypassing the flow dividers. 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 motors in any required manner. When the lock valve is switched ON, however, the inlet flow is divided into three 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. wo balancing orifices can optionally be arranged between the outlets A, B and C. hese allow some redistribution of flow and prevent unwanted torque build-up between wheels in these circumstances, and when turning. he differential lock valves can be supplied with either hydraulic, or electro-hydraulic, actuation. 2 Symbols 2. Hydraulic actuation 2.2 Electrohydraulic actuation C B A C B A 2 2 Balancing orifice D2 can be fitted 2 Balancing orifice D can be fitted Reference: EN-3 Issue: /0
2 3 echnical data Hydraulical characteristics Unit Description, value Size 08 Size 6 Nominal flow rate Q max l/min Flow range ) 2) l/min 25, 50, 75, 00 20, 60, 200, 250 Operating pressure p max bar 420 ilot pressure p p min. - p p max. bar Viscosity range mm 2 /s Max. admissible level of contamination of the hydraulic fluid NAS 638 class 9 or ISO 4406 code 20/8/5, achievable with a filter rating of ß 0 75 Fluid temperature range C Division ratio (for others, contact Bucher Hydraulics) :: Fluids Electrical characteristics (type of actuation: EH) Unit Description, value Voltage V DC 2 or 24 ower consumption W 8 Nitrile seals HL/HL mineral oils DIN 5524; other fluids consult Bucher Hydraulics NBR Duty cycle 00 ED % Ambient temperature C max. +60 Coil temperature C max. +80 (insulation class H) Enclosure protection DIN Electrical connection GDM plug Deutsch-plug, D04-2-E04 AM Junior imer plug connector (2-pole) ) State the application's effective nominal flow when ordering 2) Observe minimum flow rate in accordance with section 4. 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 volume flow rate) 4..2 Dividing function switched ON (in relation to the flow range) p [bar] 20 5 Size 6 p [bar] Size Size Size Q zu [l/min] Q zu [%] 2/0
3 4.2 Division accuracy ercentage of the applicable nominal flow without a balancing orifice between A and B (hole plugged) [%] Size 6 Size Q [ zu %] 5 Dimensions 5. M08DVD (Serie index 3) 5.. Hydraulic actuation M08DVD...-*H-3*** 5..2 Electrohydraulic actuation M08DVD...-EH-3G , , , ,5 Ø ,5 76, Clearance holes for M8 mounting cap screws to DIN 92 6,5 76,5 03 3/0
4 5.2 M6DVD (Serie index 2) 5.2. Hydraulic actuation M6DVD...-*H-2*** Electrohydraulic actuation M6DVD...-EH-2G ,5 48,5 52,4 52, ,2 58, ,2 5 48,5 52, , ,2 26, , ,5 26,2 Ø0, ,5 46 8, Clearance holes for M8 mounting cap screws to DIN Connection size M08DVD M6DVD ort ort threads ort ort threads M27 x 2 M33 x 2 and SAE /4 (3000 SI) ) A, B, C M22 x,5 A, B, C M27 x 2 and SAE (3000 SI) ), M2 x,5, M2 x,5 ) SAE-flange see datasheet /0
5 6 Models 6. Sockets GDM plug to DIN G.. AM Junior imer -J..- Deutsch plug D04-2-E Ordering code M 0 8 D V D E H -. G 2 * * D =... 4) D2 =... / Series: = M..DV Nom. Size: = 08 or 6 3-way differential lock valve: = D Division ratio, A to (B+C): : = 0 :,5 = 5 etc. 3) Division ratio B to C: : = 0 :,5 = 5 etc. 3) Control flow range: e.g. 25 l/min = 025 per sect. 3 ype of actuation : hydraulic = *H electrohydraulic = EH Design stage 0-9 ( insert by Bucher Hydraulics) lug connector: GDM-plug (DIN 43650) = G AM-Junior imer = J Deutsch-plug D04-2-E04 = Coil voltage: DC 2 Volt = 2 DC 24 Volt = 24 bei Betätigungsart *H = *** Option: (see section 7.): with make-up valve = 0 with anti-shock valves = 02 with make-up valve + inch-size port threads 3) With unequal division between A and (B+C), the larger flow goes to (B+C) between B and C, the larger flow goes to C 4) Size of balancing orifices must be plainly stated (see also sect. 2) e.g. 0.6 / 0.8 /.0 e.g. if balancing orifice D is to be 0.8 mm, then D = 08 if balancing orifice D2 is to be.0 mm, then D2 = 0 5/0
6 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 valves (pressure-relief+make-up valves) /07 = with make-up valves and inch-size port threads C B A S C B A S 7.. Examples 7... M..DVD../0 With make-up valve M..DVD../02 With anti-shock valves (pressure-relief+make-up valves) C B A 8 Application example 8. 3-wheel Drive 9 Accessories 9. ipe flanges - high pressure type (thread flange) H F E L R Y D G 6/0
7 Orderingnumber Ordering code Size D E F H L R Y Viton seal 90 Shore A Retaining screws DIN / [Nm] RF 03-R G ,2 52,4 32,99x2,62 M0x RF 04-R2 G / ,2 58,6 40,86x3,53 M0x Installation Horizontal mounting is recommended. Do not bolt the valve body onto an uneven mounting surface. Fluid Differential lock valves require fluid with a minimum cleanliness level of NAS 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. Bucher Hydraulics recommends a load capacity of > 30 N/mm2 to Brugger DIN Fluid cleanliness class Cleanliness class (RK) onto ISO 4406 and NAS 638 Code ISO 4406 Number of particles / 00 ml 4 m 6 m 4 m NAS /2/ /20/ /20/ /20/ /9/ /8/ /7/ /6/ /5/ /4/ /4/ /3/ /2/ // /0
8 3 System augmentation 3. Switch valve for traction drives 3.. USV08 and 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 Application examples Sweepers Cold milling machines Black-top pavers Forklifts Compact rollers 3..3 Circuit diagram USV08-J2 USV6-0G A B A B C B A USV08-J2 2 M08DVD A B 8/0
9 3..4 echnical data Hydraulical characteristics Unit Description, value Size 08 Size 6 Operating pressure p max bar Nominal flow rate l/min Dimensions (valve body without solenoid) mm 60x05x30 220x8x85 Ordering Information and order number USV08-J2 = USV6-0G2 = Fluid temperature range C Viscosity range mm 2 /s Maximum fluid cleanliness ISO 4406, class 20/8/5 (NAS 638 class 9); achievable with a filter rating of ß 0 75 Nitrile seals ort threads:: USV08 USV6 NBR (Nitril-Butadien-Kautschuk), 2, A, B = M27x2, C = M8x,5 = M4x,5 according to DIN EN ISO , A, B = M27x2 = M4x,5 = M4x,5 according to DIN EN ISO 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 AC = 25 W V DC = 7 W / V AC = 7 W Switching time Version E (7W): (energising) 5 50 (deenergising) Version N : (27/25W): (energising (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 I68 (when connector plugs are properly fitted) Electrical connection 3-pin square plug to ISO 4400 / DIN (standard) Deutsch-plug D04-2-EB04, AM Junior imer (2-pole) 9/0
10 by Bucher Hydraulics GmbH, D-7977 Klettgau All 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. Because the products are subject to continual improvement, we reserve the right to amend the product specifications contained in this catalogue. Classification: /0
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