Pulse Width Regulating Valve

Abstract

A pulse-width-regulating valve is for the regulation of a fluid flow or a fluid pressure. The pulse-width-regulating valve comprises a cut-off valve connected in series with an inflow valve, at least one of the cut-off valve and the inflow valve being provided with an axially displaceable or rotatable valve element which has an opening position or a closing position at a distance from a starting position of the valve element. A method of operating a pulse-width-regulating valve comprises: regulating a valve gear device by a valve synchronizer, in accordance with at least two displacement curves; and by one or more valve actuators, displacing or rotating corresponding valve elements arranged in the pulse-width-regulating valve.

Description

technical field [0001] A pulse width regulator valve for controlling fluid flow and / or fluid pressure is described. A method of operating the pulse width regulator valve is also described. Background technique [0002] Electrical Pulse Width Modulation has an analog in fluid flow in which fluid flow is controlled in a cyclic fashion by one or more valves operating in such a way that when the valve is in the open position, or fully open (On), or completely off (Off). This is also consistent with electrical pulse width modulation, where an electronic switch (usually in the form of a transistor) is fully on or fully off. Variable flow is achieved by varying the relationship between on time and off time, but generally the frequency remains constant. The relationship between the time in the on state and the time in the off state is often referred to as the duty cycle, usually represented by the symbol "D" and given as a percentage. During cyclic operation at a given operating...

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Problems solved by technology

[0008] However, some of them have the problem of obtaining a sufficiently fast acceleration or possibly a sufficiently short opening / closing time of the valve element when switching states

This means that although the valve mechanism is actually close to pulse width modulation, the valve is actually operating with considerable losses due to the throttling exhibited by the valve as it transitions between closed and open states

[0010] Furthermore, it is difficult to achieve a low enough floor for the duty cycle; that is, cutoff and thus a reduction of the duty cycle to 0% is difficult to achieve, especially without a throttling element and the associated losses

In particular, tuning the cutoff point below eg 5-10% is difficult to achieve, which means that steam engines are difficult (to some extent impossible) to tune for low power draw

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