Mechanically actuated valve assemblies

A valve assembly for detecting and mitigating a liquid leak comprising:

• a valve having an open position and a closed position, the valve being configured to permit passage of liquid through a plumbing system when the valve is in the open position and restrict passage of the liquid through the plumbing system when the valve is in the closed position;
• a sensor configured to detect a presence of the liquid proximate a base of a liquid storage device fluidly connected to the plumbing system;
• an electronically controlled plunger being in electrical communication with the sensor, the electronically controlled plunger configured to retract in response to the sensor detecting the liquid;
• and
• an actuating system in mechanical communication with the electronically controlled plunger and in mechanical communication with the valve, the actuating system comprising a lever, a release latch, and an energy storage device, wherein the retracting of the electronically controlled plunger causes the release latch to disengage from the lever, wherein the energy storage device is configured to store energy when the valve is in the open position and release energy to cause the lever to transition from a first position to a second position to close the valve when the release latch disengages from the lever.