A pneumatic valve comprising: • a valve body obtained in a single piece by casting or bar processing or by moulding a plastic material; • a shaft or spool; • at least a downward gasket and an upward gasket, each gasket consisting of a single piece annular gasket; • at least one spacer (42,44); and wherein - the valve body comprises: i) a transversal compartment translatably accommodating the a shaft or spool and suitable for the insertion of the annular gaskets (32a,32b) for sealing with the shaft according to an insertion direction along said transversal axis; ii) at least one inlet duct leading to the transversal compartment by means of an inlet opening and at least one outlet duct (16a,16b) leading to the transversal compartment by means of an outlet opening (16a',16b'), said inlet duct and outlet duct (16a,16b) being side-by-side and parallel with each other; iii) wherein, according to said insertion direction, downwardly of the outlet opening (16a',16b'), the transversal compartment is annularly delimited by a downward support surface suitable for the radial containment of the downward gasket, and upwardly of the outlet opening (16a', 16b'), the transversal compartment is annularly delimited by an upward support surface suitable for the radial containment of the upward gasket, iv) and wherein the diameter of the upward support surface is greater than the diameter of the downward support surface for a convenient insertion of the downward gasket; - the downward gasket is placed on the downward support surface and the upward gasket is placed on the upward support surface, and the upward gasket and the downward gasket have the same seal internal diameter and different external diameter, according to the diameter of the corresponding support surface; - the at' least one spacer (42,44) is placed in abutment with the downward gasket and the upward gasket, and comprises a centre annular portion permeable to the air flow, and, at the transversal ends thereof, a proximal base and a distal base having a different external diameter for the support to the respective support surfaces. • a valve body obtained in a single piece by casting or bar processing or by moulding a plastic material; • a shaft or spool; • at least a downward gasket and an upward gasket, each gasket consisting of a single piece annular gasket; • at least one spacer (42,44); - the valve body comprises: i) a transversal compartment translatably accommodating the a shaft or spool and suitable for the insertion of the annular gaskets (32a,32b) for sealing with the shaft according to an insertion direction along said transversal axis; ii) at least one inlet duct leading to the transversal compartment by means of an inlet opening and at least one outlet duct (16a,16b) leading to the transversal compartment by means of an outlet opening (16a',16b'), said inlet duct and outlet duct (16a,16b) being side-by-side and parallel with each other; iii) wherein, according to said insertion direction, downwardly of the outlet opening (16a',16b'), the transversal compartment is annularly delimited by a downward support surface suitable for the radial containment of the downward gasket, and upwardly of the outlet opening (16a', 16b'), the transversal compartment is annularly delimited by an upward support surface suitable for the radial containment of the upward gasket, iv) and wherein the diameter of the upward support surface is greater than the diameter of the downward support surface for a convenient insertion of the downward gasket; i) a transversal compartment translatably accommodating the a shaft or spool and suitable for the insertion of the annular gaskets (32a,32b) for sealing with the shaft according to an insertion direction along said transversal axis; ii) at least one inlet duct leading to the transversal compartment by means of an inlet opening and at least one outlet duct (16a,16b) leading to the transversal compartment by means of an outlet opening (16a',16b'), said inlet duct and outlet duct (16a,16b) being side-by-side and parallel with each other; iii) wherein, according to said insertion direction, downwardly of the outlet opening (16a',16b'), the transversal compartment is annularly delimited by a downward support surface suitable for the radial containment of the downward gasket, and upwardly of the outlet opening (16a', 16b'), the transversal compartment is annularly delimited by an upward support surface suitable for the radial containment of the upward gasket, iv) and wherein the diameter of the upward support surface is greater than the diameter of the downward support surface for a convenient insertion of the downward gasket; - the downward gasket is placed on the downward support surface and the upward gasket is placed on the upward support surface, and the upward gasket and the downward gasket have the same seal internal diameter and different external diameter, according to the diameter of the corresponding support surface; - the at' least one spacer (42,44) is placed in abutment with the downward gasket and the upward gasket, and comprises a centre annular portion permeable to the air flow, and, at the transversal ends thereof, a proximal base and a distal base having a different external diameter for the support to the respective support surfaces.