High pressure valve control block

In the commercial vehicles sector, modern hydraulic drive and control technology has to meet high expectations regarding flexibility and versatility. M4 – a high pressure control valve from Rexroth, available from Hytec, offers all advantages of modern valve technology and due to its great flexibility, is used in many different applications namely commercial and municipal vehicles bodies.

The Rexroth M4 is a sandwich-type valve with up to 10 valve elements beside an inlet and an end element, and is available in both open and closed centre systems. The integrated pressure compensators and the load-sensing-pressure control allow every actuator to be independently controlled from the load for every actuator port. This guarantees ease of operation and reliable control.

The load-sensing blocks from the M4-series are available in sizes 12 and 15 for inlet flows of 150 l/min or 200 l/min. The ratings for the maximum outlet-flow on the actuator side are 100 l/min and 150 l/min, including a pressure compensator and a load hold function. The pressure range is 350 bars on the pump side and 420 bars on the actuator side.

Optimised loading and unloading systems are designed with open centre inlet units with the M4 valve block permitting sensitive proportional control of the individual loads. The actuating system can be mechanically, hydraulically or electro-hydraulically controlled and contains an emergency cut-off valve, which can be integrated into the inlet unit.

Regarding modern actuating systems, built-in electronic units for analogue (voltage or PWM signal) and digital signals (CAN-bus) are available. The modular design of the on-board-electronic unit can be combined with other actuating systems. If CAN-bus control is used, a daisy-chain wiring is possible. Time functions, as well as shape and gradient of the characteristic curve, can be modified directly via CAN-bus. For example, a linear or progressive characteristic curve may be selected for an automatic function to suit the operating situation.

For special applications, as for example dump trucks, the M4-valve can be combined with a compact hydraulic valve. The Rexroth compact hydraulic systems are designed to follow a “Plug&Play” principle. Optimisation includes a minimum number of standardised cavities and guarantees a vast array of valve functions. Modular technology is characterised by ease of maintenance, permitting component level or “block” level exchanges in the field. With the possibility of this combination, field serviceability, cost rationalisation, and quality standards can be reached.