| 摘要 |
The invention relates to a switching and/or proportional valve with a valve drive (1), a valve body (2) actuated indirectly or directly by the valve drive (1), and at least one valve seat (3) that, together with the valve body (2), delimits a flow cross-section for a flow medium conducted through the valve, wherein the flow cross-section is variable depending on the position or placement of the valve body (2) relative to the valve seat (3). The valve drive (1) comprises a rotary drive having an actuator (8) rotatable via a rotational shaft (9), the actuator being coupled to the valve body (2) in such a manner that the position or placement of the valve body (2) relative to the valve seat (3) changes depending on the rotary position of the actuator (8). A cam element (11), mounted eccentrically on the rotational shaft (9) or another rotational shaft, is associated with the actuator (8), the cam element being connected for conjoint rotation on the actuator (8) or in driving connection with the actuator (8). A spring-actuated return device (14) with a plunger (13) pressed by means of a spring (15) against the cam element (11) is associated with the cam element (11), the return device operating, in an initial placement, in the direction of a return rotation of the cam element (11) via the rotational shaft (9) thereof. |
