| 摘要 |
A proportional directional control valve having a linearly movable valve element, a magnetic assembly operatively connected to the valve element where the magnetic assembly provides a magnetic field responsive to the linear motion of the valve element, a linear Hall-effect sensor assembly configured to generate an electrical signal responsive to a change in the magnetic field, and a control system that controls the linear movement of the valve element in response to a comparison of the electrical signal and a command electrical input signal. The magnetic assembly includes a non-magnetic housing defining an axial passageway, first and second magnets disposed in the passageway, first and second magnetic pole pieces disposed be in the passageway between the first and second magnets, and a non-magnetic spacer disposed in the passageway between the first and second magnets and between the first and second magnetic pole pieces.
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