| 摘要 |
Provided is a rotary valve device that can suppress the force for pressing a valve member against a valve seat surface. In a two-way valve (1), the cylindrical section (31) of a valve member (30) has a small-diameter cylindrical portion (31a), a large-diameter cylindrical portion (31b), and a cylindrical portion step surface (31c) formed between the outer peripheral surface (31a1) of the small-diameter cylindrical portion (31a) and the outer peripheral surface (31b1) of the large-diameter cylindrical portion (31b). Also, a valve main body (10) has a valve member support section (15) provided with: a small-diameter hole section (15a) to which the small-diameter cylindrical portion (31a) can rotatably fit; a large-diameter hole section (15b) to which the large-diameter cylindrical portion (31b) can rotatably fit; and a support section step surface (15c) formed between the inner peripheral surface (15a1) of the small-diameter hole section (15a) and the inner peripheral surface (15b1) of the large-diameter hole section (15b). Also, an annular seal ring (38) is provided in the seal space (R) encircled by the outer peripheral surface (31a1) of the small-diameter cylindrical portion, the cylindrical portion step surface (31c), the inner peripheral surface (15b1) of the valve large-diameter hole section, and the support section step surface (15c). |
