Slam-shut safety devices for a fluid regulator

A slam-shut mechanism for operatively connecting a slam-shut control element of a fluid regulator with a controller for the slam-shut control element, the slam-shut mechanism comprising

• a shaft;
• a cam carried by the shaft, the cam having a cam surface adapted to be operatively connected to the slam-shut control element;
• a latching pin carried by the shaft;
• a latch;
• a lever operably connected to the latch, the lever adapted to be selectively engaged by the controller,
• wherein responsive to the controller engaging the lever, the latch is movable from a first position, in which the latch securely retains the latching pin, such that the cam surface is arranged to retain the slam-shut control element in a fully open position, to a second position, in which the latching pin is released from the latch, thereby allowing the slam-shut control element to move from the fully open position to a closed position;
• and
• a spring configured to apply a compressive force on the latch, wherein the spring is adjustable to adjust the compressive force applied to the latch.

A slam-shut mechanism for operatively connecting a slam-shut control element of a fluid regulator with a controller for the slam-shut control element, the slam-shut mechanism comprising:

• a housing adapted to be coupled to a regulator body of the fluid regulator;
• a shaft having a first end and a second end opposite the first end, the shaft extending through an opening formed in the housing;
• a cam carried by the shaft at a position outside of the housing and proximate the first end, the cam adapted to be operatively connected to the slam-shut control element;
• a latching pin carried by the shaft at a position between the first end and the second end such that the latching pin is spaced from the cam;
• a latch pivotably coupled to the housing;
• and
• a lever pivotably coupled to the housing and operably connected to the latch, the lever adapted to be selectively engaged by the controller,
• wherein responsive to the controller engaging the lever, the latch is movable from a first position, in which the latch securely retains the latching pin such that the cam is arranged to retain the slam-shut control element in a fully open position, to a second position, in which the latching pin is released from the latch, thereby allowing the slam-shut control element to move from the fully open position to a closed position.

A fluid regulator, comprising:

• a regulator body having an inlet, an outlet, and a flow path extending between the inlet and the outlet, the regulator body including a seat surrounding an orifice in the flow path;
• a slam-shut control element disposed within the regulator body and shiftable along a longitudinal axis between a fully open position in which the slam-shut control element is spaced away from the seat, and a closed position in which the slam-shut control element is seated against the seat;
• a controller for moving the slam-shut control element between the fully open position and the closed position, the controller coupled to a first portion of the regulator body;
• and
• a slam-shut mechanism for operatively connecting the slam-shut control element to the controller, the slam-shut mechanism comprising:
• a shaft having a first end and a second end opposite the first end, the shaft extending along a transverse axis that is non-parallel to the longitudinal axis;
• a cam carried by the shaft at a position proximate the first end, the cam having a cam surface operatively connected to the slam-shut control element;
• a latching pin carried by the shaft at a position between the first end and the second end such that the latching pin is spaced from the cam;
• a latch;
• and
• a lever operably connected to the latch, the lever configured to be selectively engaged by the controller,
• wherein responsive to the controller engaging the lever, the latch is movable from a first position, in which the latch securely retains the latching pin such that the cam surface is arranged to retain the slam-shut control element in the fully open position, to a second position, in which the latching pin is released from the latch, and
• wherein movement of the latch from the first position to the second position allows the slam-shut control element to move from the fully open position to the closed position.