ACTUATOR ASSEMBLY FOR A LOW FLOW-RESTRICTION SHUT-OFF VALVE WITH EXCESS FLOW CLOSURE FUNCTIONALITY

摘要

An actuator assembly (600) for use with a shut-off valve in a transport or storage system. The assembly is configured to be operatively coupled to a stem of the valve for controlling fluid flow there through. The assembly includes a mounting bracket (620) coupled to the bonnet (608), a mounting sleeve (616) coupled to the stem and movable relative to the mounting bracket, and an actuator (612) having a body and an inlet formed in the body (622). The body is defined by a first body portion (623A) coupled to the mounting bracket and a second body portion (623B) coupled to the mounting sleeve and movable relative to the first body portion to expand or contract the body. The inlet is adapted to receive pressurized fluid; the body expands or contracts responsive to the pressurized fluid, and responsive to the expansion or contraction of the body, the mounting sleeve moves relative to the mounting bracket, thereby moving the stem.