Fail safe retaining plug assembly for a slam-shut safety device
AssigneeEmerson Process Management Regulator Technologies, Inc.
InventorsDavid E. Woollums, Tung Nguyen, James C. Hawkins, Roman Alexandru-Vlad
Life of this patent
Estimating the term…
Abstract
A fail safe retaining plug assembly for a slam-shut safety device includes a reset pin, a retaining plug attached to the reset pin at a proximal portion, and a safety disk attached to the reset pin at a distal portion. The retaining plug assembly is sufficiently long to prevent the safety disk from falling off of the distal portion before the safety disk contacts a valve seat. The retaining plug assembly is also sufficiently long to prevent the retaining plug from falling off of the reset pin before the safety disk contacts the valve seat.
Claims17
A retaining plug assembly for a slam-shut safety device, the retaining plug assembly comprising:
- a reset pin;
- a retaining plug attached to the reset pin, the retaining plug including a distal section and a proximal section, the proximal section including a conical portion;
- a spring retainer, the reset pin extending through a bore in the spring retainer;
- a reset spring disposed between the spring retainer and the retaining plug;
- and
- a safety disk attached to the distal section of the retaining plug
- wherein the spring retainer includes a conical recess sized to receive at least part of the conical portion of the retaining plug.
A retaining plug assembly for a slam-shut safety device, the retaining plug assembly comprising:
- a reset pin;
- a retaining plug attached to the reset pin, the retaining plug including a distal section and a proximal section, the proximal section including a conical portion;
- and
- a safety disk attached to the distal section of the retaining plug,
- wherein the distal section includes a first distal portion and a second distal portion separated by an annular recess, and
- wherein the first distal portion is located between the annular recess and a reset spring flange, and the second distal portion is at least as long as the first distal portion.
A slam-shut safety device for a fluid distribution network, the slam-shut safety device comprising:
- a valve body having a fluid inlet and a fluid outlet connected by a fluid flow path;
- a valve seat located within the fluid flow path;
- a reset pin;
- a retaining plug attached to the reset pin, the retaining plug including a distal section and a proximal section;
- a spring locator and a reset spring disposed between the retaining plug and the spring locator, the reset spring biasing the retaining plug towards the valve seat;
- and
- a safety disk attached to the distal section of the retaining plug,
- wherein the reset pin is slide able towards and away from the valve seat so that the safety disk also slides towards and away from the valve seat and in a closed position, the safety disk contacts the valve seat to prevent fluid flow through the fluid flow path, and a length of the retaining plug is sufficient to prevent the safety disk from falling off of the distal section before the safety disk contacts the valve seat.
Dependencies are inferred from the claim text.