VALVE ACTUATOR TORQUE LIMITER

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 adjusting a 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.

主权项

1. A valve actuator torque limiter including:
a moveable shaft moveable two ways in an axial direction and, in use, rotatable to cause rotation of a valve actuator drive shaft; a brake disc mounted on the moveable shaft; a first friction device located to a first side of the brake disc; a second friction device located to a second side of the brake disc; where, in use, contact between the brake disc and the first or the second friction device stops a motor rotating the moveable shaft; a casing housing at least the brake disc, the first friction device and the second friction device, and an adjusting arrangement for adjusting a position of the first friction device and/or the second friction device relative to the brake disc, wherein the adjusting arrangement is operable from outside the casing.