Slam shut safety device having disc arrestor assembly

A slam-shut safety device having a disc arrestor, the slam-shut safety device comprising:

• a valve body, the valve body having an inlet, an outlet, and defining a flow path extending between the inlet and the outlet, the valve body including a valve seat surrounding an orifice disposed between the inlet and the outlet;
• a reset pin mounted within the valve body and arranged to respond to an actuator, the reset pin shiftable relative to the valve body along an axis between an untripped position and a tripped position;
• a valve disc support, the valve disc support mounted within the valve body and operatively coupled to the reset pin, the valve disc support shiftable relative to the valve body in response to movement of the reset pin between the untripped position and the tripped position;
• a valve disc, the valve disc shiftably disposed within the valve body and movable axially along the axis of the reset pin in response to movement of the valve disc support between an open first position in which the valve disc is spaced away from the valve seat and a closed second position in which the valve disc is seated against the valve seat;
• a valve disc arrestor assembly, the valve disc arrestor assembly including an arrestor spring operatively coupling the valve disc to the valve disc support and an adjustable connection securing the valve disc to the valve disc support, the arrestor assembly arranged to apply a biasing force to valve disc in a direction parallel to the axis.

A slam-shut safety device, comprising:

• a valve body, the valve body having an inlet, an outlet, and defining a flow path extending between the inlet and the outlet, the valve body including a valve seat surrounding an orifice disposed between the inlet and the outlet;
• a valve disc, the valve disc disposed within the valve body and shiftable along a slam-shut axis between an open first position in which the valve disc is spaced away from the valve seat, and a closed second position in which the valve disc is seated against the valve seat;
• a reset pin operatively shiftable along an axis relative to the valve body between an untripped position and a tripped position, the reset pin arranged to respond to an actuator to shift the reset pin from the untripped position toward the tripped position, wherein the valve disc is axially shiftable along the axis of the reset pin;
• a valve disc support operatively coupled to the reset pin and shiftable in unison with the reset pin;
• and
• arrestor means operatively coupling the valve disc to the valve disc support, the arrestor means arranged to reduce a transfer of fluid forces from the valve disc to the reset pin.

A method of arresting movement of a valve disc in a slam-shut safety device, comprising:

• providing a valve body having an inlet, an outlet, and defining a flow path extending between the inlet and the outlet, the valve body including a valve seat surrounding an orifice disposed between the inlet and the outlet;
• providing a valve disc within the valve body and shiftable along a slam-shut axis between an open first position in which the valve disc is spaced away from the valve seat, and a closed second position in which the valve disc is seated against the valve seat;
• providing a reset pin operatively shiftable along an axis relative to the valve body between an untripped position and a tripped position, and arranging the reset pin to respond to an actuator to shift the reset pin from the untripped position toward the tripped position;
• providing a valve disc support operatively coupled to the reset pin and shiftable in unison with the reset pin;
• providing an arrestor spring operatively coupling the valve disc to the valve disc support, the arrestor spring arranged to reduce a transfer of fluid forces from the valve disc to the reset pin;
• providing a stop, the valve disc arranged to engage the stop when the valve disc is in the open first position;
• and
• arranging the arrestor spring to apply a biasing force to the valve disc against the stop when the valve disc is in the open first position.