Abstract: A break away check valve that minimizes water hammer effect while closing and for use with a wet barrel fire hydrant and water main is provided. The valve includes a controllable resistance system that applies a desired resistance (dampening) to the valve's valve plates as the valve plates translate from an open position to a closed position. The resistance system includes a hydraulic piston with a tapered end that moves through an orifice filled with oil. As the increasing diameter of the piston moves into and passes through the orifice, the resistance to the piston increases. With the piston physically engaged with the valve plates, the valve plates are dampened accordingly.

Abstract: A break-away check valve is provided. The check valve may be configured between two passageways and may regulate the flow of liquid between the passageways. The check valve may include an actuation assembly that may actuate the check valve upon the system becoming dislodged or otherwise dislocated from at least one of the passageways.