Valve assembly for blowing or draw-blowing bottles made of polymer material

A valve assembly (1) comprising a control block (2) and a blowing block (3), wherein the blowing block (3) comprises an outer body (50) having a longitudinal axis (D), inside which a blowing cylinder (51) ending at the bottom with a nozzle (58) suitable to be coupled with the neck of a container (C), is slidingly accommodated, and wherein the control block (2) receives pressurized air from at least one pressurized air source and sends it to said blowing block (3) according to a predetermined pressure profile dependent on a selected blowing cycle, wherein the control block (2) comprises a plurality of dispensing valves (11a, 11b, 11c) for dispensing pressurized air at different pressures, and an air exhaust valve (39), characterized in that said dispensing valves and said air exhaust valve (11a, 11b, 11c, 39) are driven by pressurized air at a pressure between 15 and 40 bar,

• wherein the control block (2) comprises a first conduit (12a) for pressurized air at a first pressure (P1), a second conduit (12b) for pressurized air at a second pressure (P2) that is greater than the first pressure (P1), and a third conduit (12c) for pressurized recovery air at a third pressure (Px) that varies in a range greater than or equal to said first pressure (P1) and less than or equal to said second pressure (P2),
• wherein said first, second, and third conduits (12a, 12b, 12c) are intercepted by first, second, and third dispensing valves (11a, 11b, 11c) of pressurized air, at said first, second, and third pressure (P1, P2, Px), respectively,
• wherein said dispensing valves (11a, 11b, 11c) are connected to a transverse conduit (21) that comprises a connection opening (22) to the blowing block (3),
• wherein a first branch conduit (16), which is T-shaped and comprises a first portion (16′) perpendicular to the second conduit (12b) and a second portion (16″) extending along a transverse direction with respect to said first, second, and third conduits (12a, 12b, 12c) and which lies on a plane parallel to the plane on which axes of said first, second, and third conduits (12a, 12b, 12c) lie, starts from the second conduit (12b) for the pressurized air at the second pressure (P2), and
• wherein the following starts from said second portion (16″) of the first branch conduit (16):
• a second branch conduit (37a) that extends perpendicularly to the plane in which the first branch conduit (16) lies;
• a first driving channel (30c) intercepted by a first solenoid control valve (32c);
• and
• a second driving channel (33) intercepted by a second solenoid control valve (34),
• wherein a third branch conduit (37b) that extends on a plane parallel to the first branch conduit (16) starts from the second branch conduit (37a), and
• wherein a third and a fourth driving channel (30a, 30b) intercepted by a third and fourth solenoid control valve (32a, 32b), respectively, perpendicularly start from said third branch conduit (37b) in the same plane parallel to the first branch conduit (16).