Block valve for vacuum line or network with emergency input

摘要

The valve (1) has a control device (5) e.g. manually controlled on/off ball valve, arranged on a main passage (2) and comprising a handle that is manually operated by an operator and moved between an open position and a closed position. The control device allows fluid communication between two orifices in the open position, and interrupts the fluid communication between the orifices in the closed position. An auxiliary passage is connected to the main passage provided between the control device and one of the orifices through an upstream end of the auxiliary passage that has third orifice.