| 摘要 |
<p>A port block 10 as a housing 24 is formed with a first port 11 communicating with one end portion of a communicating hole 31, and a second port 12 communicating with the other end portion of the communicating hole 31, and a needle valve shaft 18 formed with a tapered portion 18a is movably mounted in an axial direction in the communicating hole. The needle valve shaft 18 is driven in an axial direction by rotating a screw shaft 27 by an electric motor 20, and the rotation of the needle valve shaft 18 is controlled by a rod 42 as a guide. The needle valve shaft 18 is provided with a pressure counteracting shaft 36 having a pressure receiving piston 38, and counteracts an axial thrust applied to the needle valve shaft 18 toward the screw shaft 27 by the fluid in the second port 12.</p> |
