| 摘要 |
<p>A flow control valve assembly which shows high liquid-tightness and good flow controllability even if a high-pressure, low-viscosity fluid is used. It has a housing (1) formed with an inlet port (2) and an outlet port (3), and a spool (4) inserted in the housing. First and second fluid chambers (5,6) for applying fluid pressures on both ends of the spool communicate with each other through a fluid passage (8) having an orifice (7). The opening of the valve portion is adjusted by the movement of the spool so that the spool driving force produced by the difference in the pressures applied to both ends of the spool balances with the force of a biasing means (10), whereby a fluid flows through the orifice at a controlled rate. This control valve assembly has an elastic annular seal (11). When the spool moves toward the annular seal, the land portion on the spool outer periphery is adapted to butt the seal, thereby closing the fluid passage. In this closed state, fluid leakage is reduced substantially to zero. Also, it is possible to control the fluid flow even while the flow rate is very low. <IMAGE></p> |
