| 摘要 |
An emergency shut-off valve includes a valve body (12), an inlet (14), an outlet (16), and a fluid passageway. A valve closure assembly (20) is positioned at least partially within the valve body, and includes a shaft (26), an arm coupled to the shaft, a closure member (22) coupled to the arm (24), and a biasing member (38). The arm, closure member, and shaft rotate about an axis between open position and a closed position. A valve actuation assembly to rotates the arm, closure member, and shaft, and includes a securement member and an electromagnet adapted to generate a first magnetic force in a first state and a second magnetic force in a second state. In the first state, a contact surface of the securement member magnetically couples to a surface of the electromagnet, and in the second state, the closure member, the arm, and the shaft are rotated into the second closed position by the biasing member. |
