Valve for dental suction systems

A suction valve for a dental treatment unit, the suction valve being adapted to be connected through tubings to a suction system placed downstream of the dental treatment unit, the suction valve comprising:

• an input conduit;
• an output conduit configured to be connected to the suction system, the output conduit being disposed perpendicularly to the input conduit and sharing a common edge at a connection therewith;
• a valve seat interposed between the input and output conduits;
• a diaphragm placed transversally to the input and output conduits and defining a chamber above the diaphragm, the diaphragm being mobile between a first resting position, wherein the diaphragm adheres against the valve seat blocking a passage of air and liquids between the input conduit and the output conduit, and a second active position, wherein the diaphragm is distanced from the valve seat, thereby allowing the passage of the air and the liquids between the input conduit and the output conduit;
• a connecting conduit having an entry point and allowing air passage between the chamber and the output conduit;
• and
• an electrically controllable pilot valve switchable between:
• a resting position, wherein the pilot valve allows passage of environmental air to the chamber through a terminal portion of the connecting conduit embedded in a body of the suction valve, the pilot valve comprising a first portion, a closing point, and a second portion, and
• an active position, wherein the pilot valve blocks the passage of the environmental air, and connecting the chamber with the output conduit through the connecting conduit;
• wherein, at an insertion point of the connecting conduit in the output conduit, there is provided a non-return valve preventing an input flow to the connecting conduit from the entry point, thereby preventing an upwelling of liquids from the output conduit into the connecting conduit and to the pilot valve and/or to the chamber.