There are four valves in the heart and each one has strong flaps called “leaflets” that control blood flow. Leaflets open to let blood move through the heart and out to the rest of the body. They then ...

A roundabout in Plymouth city centre has been partially closed after a tractor collided with a water main valve. Derrys Cross Roundabout is closed at the southern end due to damage to the valve ...

On Tuesday morning, the City of Clarksville’s official Facebook page posted a heads-up that water would be turned off for repairs near Trenton Road, but the post did not specifically mention ...

The ‘pinching’ arm is raised and lowered by an RC Car servo. When the valve is in the closed position, the servo does not need to continually apply pressure, the servo is powered down and the ...