| 摘要 |
A sliding valve spool and method of making the same for a directional, reversing flow control air valve, such as a four-way valve, a three-way valve, a two-way valve, and the like. A plurality of annular valve members and a pair of annular centering seals are integrally molded on a valve body, in a single molding operation and which function to maintain the center position of the valve spool during use of the same in a valve spool bore in an air valve, and which also provide a sealing function with said bore. The outer, equal diameter peripheries of the molded valve members and the molded annular centering seals are simultaneously ground together with an annular pressure seal groove adjacent each of the annular centering seals.
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