Study of a Flapper-Nozzle system for a water hydraulic servovalve

摘要

The paper discusses the characteristics of a flapper-nozzle system for water hydraulic ser- vovalves. High pressure water at the supply port is first used as the working fluid for the hydrostatic bearings supporting the spool. Spool valve stiction induced by poor lubrication with water is thus avoided. The fluid is then led to the ends of the spool and is used as the working fllid of the flapper -nozzle system.