| 摘要 |
Disclosed is a valve having a body having an inlet channel, an outlet channel in fluid communication with the inlet channel, and a flow-monitoring region situated medially between the inlet and outlet channels. Further provided within the body is a secondary channel having a first end and a second end, the first end in fluid communication with the inlet side of the flow-monitoring region and the second end extending to the outside of the body. The first end of the secondary channel is provided with an area of constriction proximal to the inlet side of the flow-monitoring region. Within the secondary channel is a piston slideably moveably situated. The piston is a pole magnet having a magnetic axis substantially co-linear with the axis of the secondary channel. The diameter of the piston is greater than the diameter of the constriction. Secured within the second end of the secondary channel is a plug. This plug is a pole magnet having a magnetic axis in alignment with the axis of the secondary channel. The polarity of the magnetic axis is opposite to the polarity of the magnetic axis of the piston, thereby causing magnetic repulsion between the plug and the piston in the direction of the first end of the secondary channel and of the constriction of the secondary channel. Further provided is a by-pass channel having an upper end and a lower end, the upper end in fluid communication with the secondary channel in an area above the location of the piston and below the location of the plug. The lower end of the by-pass channel is in fluid communication with the outlet side of the flow-monitoring region.
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