| 摘要 |
A piston (46) is configured by a piston body (68) and a support (70) such that the piston (46) is divided, along a direction of axis line, into the piston body (68), which is formed integrally with a valve element (44), and the support (70), which is provided separately from the valve element (44). A piston ring (72), which slides along a body, is held between the piston body (68) and the support (70). The piston body (68) is constantly in contact with one side face of the piston ring (72), and the support (70) is constantly in contact with the other side face of the piston ring (72). |
