Differential Lock Valve

Transcription

1 Differential Lock Valve Series M..DVV (for 4 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 three 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 four 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. hree balancing orifices can optionally be arranged between the outlets A, B, C and D. 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 electrohydraulic, actuation. 2 Symbols 2. Hydraulic actuated 2.2 Electrohydraulic actuated D C B A D C B A 2 2 S S Balancing orifice D2 can be fitted 2 Balancing orifice D can be fitted Reference: EN-02 Issue: /8

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 HL/HL mineral oils DIN 5524; other fluids consult Bucher Hydraulics Electrical characteristics (type of actuation: EH) Unit Description, value Voltage Volt DC 2 or 24 ower consumption W 8 Nitrile seals NBR Duty cycle 00 ED % Ambient temperature C max. +60 Coil temperature C max. +80 (insulation class H) Enclosure protection DIN I68 Electrical connection GDM plug DIN 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. 2/8

3 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 [%] 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 %] 3/8

4 5 Dimensions 5. M08DVV -*H-0*** (hydraulic actuated) x Mounting thread M0-20mm deep 5.2 M08DVV -EH-0G (elektrohydraulic actuated) x mounting thread M0-20mm deep 4/8

5 5.3 M6DVV -*H-0*** (hydraulic actuated) 5.4 M6DVV -*EH-0G (elektrohydraulic actuated) clearance holes for M8 mounting cap screws to DIN Connection size M08DVV M6DVV ort ort threads ort ort threads G ¾ M33 x 2 and SAE ¼ (3000 SI) ) A, B, C, D, S G ½ A, B, C, D M27 x 2 and SAE (3000 SI) ), G ¼,, S M2 x,5 ) SAE flanges see data sheet /8

6 6 Models 6. Sockets GDM plug to DIN G.. AM Junior imer -J..- Deutsch plug D04-2-E Ordering code Series: = M..DV Nom. size : = 08 oder 6 M 0 8 D V V E H -. G 2 * * D =... 2) D2 =... / 4-way differential lock valve: = V Division ratio, A + B to C+D: : = 0 :,5 = 5 etc. ) Division ratio A to B: : = 0 :,5 = 5 etc. ) Division ratio C to D: : = 0 :,5 = 5 etc. ) Control flow range: z. B. 25 l/min = 025 per section.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 operating mode *H = *** Option (see section 7.): with make-up valve = 0 with anti-shock valves = 02 ) With unequal division: Between A+B to C+D, the larger flow goes to C+D, Between A and B, the larger flow goes to B, Between C and D, the larger flow goes to D 2) 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 6/8

7 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) 7.. Examples 7... M..DVV -EH-0G../0 With make-up valve D C B A M..DVV...-EH-0G../02 With anti-shock valves (pressure-relief+make-up valves) D C B A S S 8 Application example 8. 4-wheel drive with the same flow rates at all 4 wheel motors. S D C B A 7/8

8 9 Accessories 9. ipe flanges - high pressure type (thread flange) - Max. operating pressure 420 bar - Flange size SAE J58 code 6 / ISO 662- hreaded pipe flanges are spot-faced for DIN 2353 pipe fittings Material: S37 / for Viton seals, contact Bucher Hydraulics GmbH H F E L R Y D G 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 ¼ ,2 58,6 40,86x3,53 M0x40 60 Other pipe flanges on request 0 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 Number of particles / 00 ml ISO m 6 m 4 m NAS /2/ /20/ /20/ /20/ /9/ /8/ /7/ /6/ /5/ /4/ /4/ /3/ /2/ // info.kl@bucherhydraulics.com 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: /8