Control valve with integral exhaust partic. for riveting machine

摘要

A substantially cylindrical outer element (4) has an axial bore, stopped at one end, and connected via its remaining open end with a silencer (18). It exhibits four substantially radial ducts. An inner element (7), capable of fluid-tight shift within the outer element, is embodied with an axial bore (10) and with two external circumferential undercuts (11,12). A piston (15) is capable of fluid-tight shift within the axial bore of the inner element between respective limit positions in which holes (13) that connect the axial bore with the relative circumferential under (11) are blocked and left clear. The inner element and the piston are biased by a spring (14) into an at-rest configuration where the first outlet duct (2) connects with the axial bores of the inner and outer elements and the second outlet duct (3) connects with the inlet duct (1).