| 摘要 |
A valve actuator torque limiter (103) includes a moveable shaft (208) moveable two ways in an axial direction and, in use, rotatable to cause rotation of a valve actuator drive shaft (202). The limiter further includes a brake disc (214) mounted on the moveable shaft; a first friction device (216A) located to a first side of the brake disc, and a second friction device (216B) located to a second side. In use, contact between the brake disc and the first or the second friction device stops a motor (302) rotating the moveable shaft. The limiter also includes a casing (102) housing at least the brake disc, the first friction device and the second friction device, and an adjusting arrangement (224A, 224B) for adjustinga position of the first friction device and/or the second friction device relative to the brake disc. The adjusting arrangement is operable from outside the casing. |
