| 摘要 |
PROBLEM TO BE SOLVED: To reduce a pressure-receiving area of a valve body by reducing a diameter of each port, in a changeover valve which has a plurality of the ports at a valve seat member, slides the valve body by a plunger, and switches the ports by the valve body to make conductive.SOLUTION: A valve body 3 is made to penetrate a valve body attachment hole 43 of a plunger 4. A tapered surface 44 is formed around an opening part of the valve body attachment hole 43, and a cylindrical flow passage 44A is formed. A clearance is formed between the valve body attachment hole 43 and the valve body 3. A high-pressure fluid from a D-port 21 is made to flow into a C-changeover port 22 or an E-changeover port 23 via the flow passage 44A. Diameters of the C-changeover port 22 and the E-changeover port 23 are reduced by securing a flow rate by the flow passage 44A. The valve body 3 is reduced in size. A clearance between the plunger 4 and the valve seat member is narrowed by securing the flow rate by the flow passage 44A, and the plunger 4 is made to abut on the valve seat member without making the valve body 3 follow the abutment at a turn of the plunger 4. Similarly, a three-way changeover valve can be constituted. |
