| 摘要 |
An adjustable high pressure, low flow metering valve provides a sleeve extending about a restrictor shaft, the sleeve having a narrow helical groove formed in the inside diameter. A restrictor shaft within the sleeve encloses the groove and forms a sealed helical flow channel. The length of the flow channel is varied by withdrawing the restrictor shaft in the sleeve, whereby only a selected axial extent of the groove is enclosed by the sleeve to form a confined flow path. The shaft is provided with a threaded engagement in the body of the metering valve, so that rotation of an adjustment knob provides extremely fine control of the length of the flow path, and thus highly accurate selection of the flow resistance.
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