| 摘要 |
A spool type control valve, comprising: a valve block having a cylinder bore with drilled holes on the cylinder bore internal wall; a valve spool inserted in the cylinder bore; wherein the valve spool having separation sleeves each being spaced apart on the valve spool; wherein an all-metal-seal ring is assembled and fitted on each of the separation sleeves; and wherein each of the all-metal-seal rings is constructed with three different functioning ring layers: a cylinder seal layer, an absorption layer, and a shaft seal layer; wherein the cylinder seal layer seals the cylinder bore internal wall and does come into contact with the valve spool surface; wherein the absorption layer absorbs any dimensional variations during dynamic movement of the valve spool; and shaft seal layer seals the valve spool and does not come into contact with the cylinder bore internal wall.
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