Slam shut safety device having disc arrestor assembly

摘要

A slam-shut safety device having a disc arrestor includes a valve body, a valve seat between an inlet and an outlet, and a reset pin shiftable between untripped and tripped positions. A valve disc support includes has a threaded stem and is operatively coupled to the reset pin. A valve disc fits on the stem of the support and shifts in response to movement of the valve disc support between an open position and a closed second position in which the valve disc is seated against the valve seat. A threaded nut is securable to the threaded portion of the stem of the valve disc support, and an arrestor spring is positioned on the stem of the valve disc support and is secured by the threaded nut. The arrestor spring is arranged to apply a biasing force to valve disc.

主权项

1. 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 including a stem having a threaded portion, 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 including a central aperture sized to fit on the stem of the valve disc support, the valve disc shiftably disposed within the valve body and movable 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 threaded nut securable to the threaded portion of the stem of the valve disc support; an arrestor spring positioned on the stem of the valve disc support and secured by the threaded nut, the arrestor spring arranged to apply a biasing force to valve disc.