BMG supplies a wide range of HydraForce electro-proportional valves, which are suitable for use in many applications in agriculture, construction, materials handling, fluid conveyance, mining and quarrying. They are proven for dependable operation in heavy-duty conditions. Efficiency, response times and signal integrity are optimised using Pulse Width Modulation (PWM) digital signal logic. PWM works by pulsating DC current and varying the amount of time that each pulse stays on, to control the amount of current that flows to a device. The main advantage of PWM is that power loss in the switching devices is negligible.
BMG’s range of Hydraforce proportional valves includes flow control (PV) and pressure compensating flow regulator valves (PFR), directional control (SP) and pressure control (TS) valves, with a focus on proportional control. Unlike directional control valves, which allow full flow when energised, proportional control directional valves control flow proportional to an electrical input signal.
Proportional valves provide a change in output pressure or flow in the same ratio as the change in the input signal. For example, a 4-20 mA input signal may correspond to a 50-200 bar pressure setting. If the input signal is 4 mA, then the output pressure setting will be 50 bar. As it gradually increases to 20 mA, so too does the pressure setting increase to 200 bar. This feature offers machine cycles, which are safely operated at greater speeds, with controlled start and stop characteristics. Regulated acceleration and deceleration results in improved overall machine cycle times and enhanced production rates.
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