| 摘要 |
A balance of force acting on a pool 21 of a control valve 20 is expressed by (P1-P3).A=F+f When it is assumed that a pressure difference P1-P2 before and after a throttle 42 is DELTAP12 to modify the above expression, an expression DELTAP12.A+(P2-P3).A=f+F is obtained. According to the present invention, the force DELTAP12.A corresponding to the pressure difference DELTAP12 before and after the second throttle 42 of the first term of the left-hand side is applied to the control valve 20 as a force capable of canceling the flow force f at the first term of the right-hand side.
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