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Abstract: The non-circular opening spool valve is one of basic
construction of hydraulic valve, which places axisymmetrically several
notches on the spool to form the restriction configuration. This type of
valve is widely used in direction and velocity control for hydraulic
actuators. Its restriction location, shape and flowing angle are shifted
with the spool motion, and therefore it is difficult to achieve a
reasonable prediction of the flow force by the traditional theoretic
methods. The computational fluid dynamic method is used to investigate
the three dimensional flowing fluid in a typical flow-direction control
valve. The numerical result of the steady flow force and flow-pressure
characteristics on the whole opening range agree well with the observed
one. The results show that direction of steady flow force in the
non-circular opening spool valve changes with the shift of the flow
direction on the notch pass. A very useful guidance on the prediction of
the steady flow force and other performances of non-circular opening
spool valve is provided.
Key words: Non-circular opening spool valve Fluid simulation Steady
flow force
CLC No: TH137.52
国家自然科学基金(50175097)和高等学校博士点基金(20010335037)资助项目.
Received 20020815, received in revised form 20021120
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