Torsional spring for a slam-shut safety device
AssigneeEmerson Process Management Regulator Technologies, Inc.
InventorsTheodor Cojocaru, Adrian Valean, Roman Alexandru-Vlad
Life of this patent
Estimating the term…
Abstract
A cam assembly for use in a slam-shut safety valve includes a cam having an elongated first cam arm, and the cam is pivotable about a rotational axis. The cam assembly also includes a torsional spring having a pair of stationary outer arms and a pair of pivotable inner arms, wherein the pair of stationary inner arms is coupled to a portion of the first cam arm. The pair of inner arms is adapted to act on the first cam arm to bias the cam into a position that allows the cam to be relatched in a valve rearming process. The pair of inner arms is symmetrically disposed about the first cam arm to prevent lateral displacement of the cam.
Claims8
A slam-shut safety valve for a gas distribution system, the slam-shut safety valve comprising:
- a valve body;
- a diaphragm disposed at least partially within an interior portion of the valve body, with at least part of the diaphragm being displaceable into the interior portion of the valve body, the diaphragm having a first side being exposed to gas system pressure;
- a plunger connected to the first side of the diaphragm;
- a cam rotatably mounted within the interior of the valve body, the cam having a first cam arm and a third cam arm, wherein the first cam arm is coupled to the plunger;
- a torsional spring operatively coupled to the first cam arm and at least one surface disposed in the interior portion of the valve body;
- and
- a reset pin assembly, the reset pin assembly including an elongated reset rod and a relatch plug fixedly coupled to the reset rod, wherein the torsional spring is adapted to act on the first cam arm to bias the cam into a desired position that allows the third cam arm to engage a shoulder portion of the relatch plug when the reset rod is displaced towards the cam in a valve rearming process, thereby relatching the cam.
Dependencies are inferred from the claim text.