HYDRANT SHEAR VALVE AND METHOD

摘要

A system and method are disclosed for shutting off the flow of liquid to a hydrant. A break away frangible activator of a valve body becomes dislodged responsive to a hydrant receiving sufficient inadvertent impact. A valve member closes in response to the impact to close off the flow of fluid to the hydrant.

主权项

1. A hydrant shear valve for a hydrant coupled in fluid communication with a hydrant water supply pipe having a pipe flange, comprising:
a valve body having fastener receiving openings for mounting the valve in fluid communication between the hydrant and the water supply pipe; the valve body having a valve seat; a two-piece valve member pivotally mounted in the valve body to move between an open position and a closed position; the valve member having a pair of valve member portions for being disposed overlapping one another axially aligned within the valve body in the open position and for being disposed in a co-planar configuration in engagement with the valve seat in the closed position; at least one bias member for maintaining releaseably the valve member portions in the open position and for permitting the valve member portions to be moved to the closed position under the force of fluid flowing from the supply pipe; and at least one frangible actuator for breaking away when the hydrant is hit with sufficient impact to free the bias member for causing the valve member portions to move toward the closed position.