Block valve for vacuum line or network with emergency input

A block valve with emergency input, comprising a valve body traversed by a main fluid passage between a first orifice located at an upstream end of the said main passage and a second orifice located at a downstream end of the main passage, the valve body further comprising:

• a control device arranged on the main passage, comprising an on/off type ball valve operable manually by an operator and movable between at least:
• an open position in which the control device allows fluid communication between the first and second orifices, and
• a closed position in which the control device interrupts any fluid communication between the first and second orifices, and
• an auxiliary fluid passage fluidly connected via its upstream end to the main passage between the control device and the first orifice, the auxiliary passage comprising a third orifice at its downstream end, the third orifice having a shutter device that shuts the third orifice when the control device is in the open position wherein the upstream and downstream ends of the main passage having the first and second orifices, respectively, and the downstream end of the auxiliary passage having the third orifice, are provided with connecting means suitable and designed for connecting lines to the ends,
• wherein the control device comprises a rotating member operable by the operator between the open and closed positions, wherein the valve body is formed of two sub-units which are joined to one another, the first sub-unit comprising the part of the main passage comprising the downstream end of the main passage with the second orifice and the control device, and the second sub-unit comprising the part of the main passage comprising the upstream end of the said main passage with the first orifice and the auxiliary passage with the third orifice, and
• wherein a negative pressure gauge is connected to the main passage or to the auxiliary passage between the control device and the first orifice or the third orifice.