The ball valve is a device for the interception of fluids. It is composed by: • body or cover, it’s the external part of the valve in which the shaped connections are machined for mounting the valve on the pipeline; • shutter (ball) it’s the effective interception device of the valve; the tightness is obtained by means of the compression of two soft material seats against the ball; • system is the connection system between the shutter and the operation organ; • operation organ is the device to operate the valve; this device which is normally a lever handle, is also available on request in other op.