Pilot operated valves are available with 2 types of actuation: electrohydraulic + hydraulic. They are designed for flows of up to 1 100 litres per min...
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There are 5 models of these valves available from Bosch Rexroth for operation at up to 350 bar, with maximum flows up to 150 litres per minute.
VIEW PRODUCTDirectional solenoid valves differ from manually and hydraulically pilot-operated valves as they are electrically controlled instead of using complex mechanical links or bulky hydraulic pilot lines to actuate the valve. The use of directional solenoid valves can simplify installations, resulting in substantial cost savings as an additional benefit.
Directional solenoid valves that are pilot operated are the most widely used solenoid valves. Pilot-operated directional solenoid valves use system line pressure to open and close the main orifice in the valve body. In a piston-style valve, the main orifice is held closed with a piston seal pressed against the main orifice by both the combination of fluid and spring pressure. In a normally closed valve, the piston is shifted or opened when the pilot operator is energized.
This allows fluid behind the piston to evacuate through the valve outlet. At this point, the system line pressure moves the piston, opening the main orifice of the valve allowing high capacity flow through the valve. When energizing the coil of a normally open valve, fluid pressure builds up behind the piston, forcing the piston to seal the main orifice of the valve.
Directional solenoid valves that feature direct operation directly open or close the main valve orifice. This is the only flow path in the valve. Direct operated directional solenoid valves are used in systems that require low flow capacities and in applications with a low pressure differential across the valve orifice.
The sealing surface that opens and closes the main valve orifice is connected to a solenoid plunger. Directional solenoid valves operate from a zero pressure differential to a maximum rated pressure differential – regardless of line pressure. Pressure drop across the valve is not required to hold the valve open.
Hytec South Africa is the only certified Bosch Rexroth Service Centre in Africa. This means that when you send in a Bosch Rexroth hydraulic component to Hytec SA for service or repair, it will be configured according to the same precise quality standards as adhered to at the Bosch Rexroth facility in Lohr, Germany – ensuring you maintain German-engineered standards of quality in Africa.
In addition, Hytec SA has established a series of operations centres to provide customers outside of South Africa with access to leading hydraulics, pneumatics, control and other technologies and products from within the Bosch Rexroth Africa. Bosch Rexroth Africa Development distribution centres represent all of its 24 brands, along with every solution-based service that Bosch Rexroth Africa has to offer.
Hytec SA has also appointed a series of distributors to provide customers outside of South Africa with the same access.
Our range of hydraulic products consists of over 500 different components. This extensive range includes directional poppet type valves manufactured by Bosch Rexroth. In addition to this range of hydraulic products, we also offer world-class repair, service, testing and calibration and installation facilities to meet the requirements of any application. Our hydraulic products include hydraulic pumps, gearboxes, coolers, valves, pilot control units, motors, cylinders, hoses and fittings, maintenance tools and accessories.
A hydraulic solenoid valve is a directional valve used to open, close and change the flow of liquid in a hydraulic system. This control unit holds an electric coil with a central, ferromagnetic core.
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