Actuator assembly for a fluid control device

A fluid control device comprising:

• a valve body having an inlet, an outlet, and a fluid flow path between the inlet and the outlet;
• a seat;
• a valve assembly having a stem and a control element that is coupled to the stem, wherein the control element and the stem are movable along a longitudinal axis and biased toward a closed position, in which the control element engages the seat;
• an actuator assembly including a shaft that is operatively coupled to the stem;
• a cage having circumferential openings and partially surrounding the valve assembly such that the fluid flow path extends around the valve assembly;
• wherein rotational motion of the shaft in a first rotational direction causes movement of the stem and the control element in a first translational direction to separate the control element from the seat;
• and
• a slam-shut trigger that is configured to control rotation of the shaft in a second rotational direction responsive to fluid pressure.

A fluid control device comprising:

• a valve body having an inlet, an outlet, and a fluid flow path between the inlet and the outlet;
• a seat;
• a valve assembly including a control element and a stem that is coupled to the control element, the control element and the stem being movable along a first axis and biased toward a closed position in which the control element engages the seat;
• and
• an actuator assembly including a first portion disposed inside the valve body and a second portion that is accessible outside the valve body, the first portion including a first shaft that is operatively coupled to the stem of the valve assembly, the second portion including a second shaft operatively coupled to the first shaft;
• a Scotch yoke mechanism operatively coupling the first shaft to the stem;
• and
• a cage having circumferential openings and partially surrounding the valve assembly such that the fluid flow path extends around the valve assembly;
• wherein rotational motion of the first shaft in a first rotational direction causes movement of the stem and the control element in a first translational direction.