MULTI-CIRCUIT PROTECTION VALVE ASSEMBLY AND AIR PROCESSING UNIT

The invention relates to a multi-circuit protection valve assembly (2), comprising, attached to or integrated into a main housing (2b), an air inlet; main outlets (6); main supply lines; and main overflow valves for protecting the main outlets (6), wherein it further comprises an extension part (20) having, attached to or integrated into an extension housing (25), an extension inlet (21); an extension outlet (7); an extension line; and an extension overflow valve for protecting the at least one extension outlet (7), wherein the extension housing (25) is detachably fixed to the main housing (2b) such that the extension inlet (21) is flow-connected to an auxiliary outlet (19) in the main housing (2b).According to the invention, the extension housing (25) is detachably fixed to the main housing (2b) by a hollow screw (30) having a cavity, wherein said hollow screw (30) passes through the extension housing (25) and is screwed into the auxiliary outlet (19) such that the extension housing (25) is clamped to the main housing (2b), and such that compressed air discharged through the auxiliary outlet (19) can be conducted through the cavity inside the hollow screw (30) to the extension overflow valve and the at least one extension outlet (7).