Control block EDD Modular Directional Valve

Transcription

1 Control block EDD Modular Directional Valve

2 2 Control block EDD Modular Directional Valve Bosch Rexroth Oil Control S.p.A. introduces this innovatory Directional Control Valve size 8 which allows to create electro-hydraulic control of actuators (motor or cylinders) in open circuits. It is the ideal solution for any possible mobile and industrial application when the required flow rate it is over standard NG06. Features Modular system product line Escala Size 08. Possibility to work on single functions up to 80 l/min. Solution ED flangiable and combinable with ED series Integrated antishock valve on A/B. Valve elements with solenoid operated directional spool. Advantages Cast body design for performance to size and weight comparison. Streamlined design for minimized pressure drop. Eicient solenoid system to maximize flow capacity and spool shift performance. Zinc plated body and push tubes for superior corrosion resistance. EDD - Technical Data Max Pressure: 310 bar (P, A and B) (4500 psi) Inlet flow max: 100 l/min Outlet flow: 80 l/min (A-B) Ports connection: P and T: ½ Gas, ¾ Gas and SAE 12

3 Modular Directional Valve Control block EDD Mobile Applications 1.Telehandler 2. Cranes 3. Drilling machine 4. Dozer 5. Road sweeper 6. Garbage truck 7. Hook loader 8. Truck mounted crane 9. Special excavators 10. Forest machinery 11. Fork lift truck 12. Aerial work platform 13. Scissor lift 14. Tractors 15. Harvesters

4 4 Control block EDD Modular Directional Valve EDD - Control block Solenoid Operated, spring return directional control valves 4/2 or 4/3. Load sense option available, antishock and anticavitational valve available. Anticavitational and antishock EDD Modular valve Assembly Drawing Compact design Solution ED flangeable and combinable with ED Series (Modular Escala System). Hydraulic circuit simplified Integrated antishock valve on A/B Size 08, with the possibility LS system, electrical operated on-o direct acting

5 Modular Directional Valve Control block EDD 5 EDD - Modular directional valve Size 08 Port 1/2 Gas SAE10 Flow Q l/min 80 Maximum operating pressure P, A, B Pmax bar 310 T P max bar 250 Number of directional-control valves, max 10 Actuation Electrical V DC 12, 13, 24, 27, 48 Connection type EN Deutsch DT 04-2P AMP-J

6 6 Control block EDD Modular Directional Valve Configurations Configurations Configurations EDD - Configurations Options Options Options Secondary Valves possible configurations Only Only flangiable flangiable version version = M Only flangiable version Only flangiable version = M Spool variants Spool Variants

7 Modular Directional Valve Control block EDD 7 EDD - Section Principles of operation, cross section The sandwich plate design directional valve elements D8_5 are compact direct operated solenoid valves which control the start, the stop and the direction of the oil flow, with the option to adjust the spool switching time. These elements basically consist of a stackable housing (1) with a control spool (2), one or two solenoids (5), and one or two return springs (4). The spring chambers are connected to the tank port. When the coil is energized, the spool (2) travels and oil is pushed to tank from one of the spring chambers: if the cross section of the orifices changes, the switching time changes as well. Three orifice sizes are available: smaller orifice results in longer switching time, even though the actual time is dependent upon pressure, flow and viscosity. When energized, the force of the solenoid (5) pushes the control spool (2) from its neutral-central position to the required position, and the required flow from P to A (with B to T), or P to B (with A to T) is achieved. Once the solenoid is de-energized, the return spring (4) pushes the spool thrust washer (3) back against the housing and the spool returns in its neutral-central position. Each coil is fastened to the solenoid tube by a ring nut (6). A pin (7) allows to push the spool (2) in emergency conditions, when the solenoid cannot be energized, like in case of voltage shortage. The secondary cartridge valves are designed for quick response and stable pressure control (8); they also incorporate a reverse flow check for anti-cavitation.

8 Bosch Rexroth Oil Control S.p.A. Via L. da Vinci, 5 I Nonantola (MO), Italy Tel Fax compact-directional-valves@oilcontrol.com RE 98352/03.12 Bosch Rexroth Oil Control S.p.A. - All rights reserved. Printed in Italy.