Four-way directional control valve

摘要

In a four-way directional control valve (6) of simplified construction and reduced manufacturing costs first and second hollow cylindrical valve elements (20a,20b) are arranged coaxially. Adjacent to opposite ends of said valve elements (20a,20b) first and second valve seats (13,14) and first and second valve closure elements (15,17) are provided. First and second pressure-regulating chambers (41,42) are arranged between separator walls (37,38) of said valve elements (20a,20b) and first and second partition walls (35,36) associated to said first and second valve seats (13,14). A pilot valve (30) can be switched between switching positions for introducing high-pressure fluid originating from a first pipe into the first or second pressure-regulating chamber (41,42) via a common high-pressure passage (31), a high pressure introducing hole (32) and two pilot holes (33,34) respectively associated to said pressure-regulating chambers (41,42). Said control valve (6) can be switched into a state where the first pipe (A) communicates with the fourth (C) and the second pipe (B) communicates with the third pipe (D) and to another state where the first pipe (A) communicates with the third pipe (D) and the second pipe (B) communicates with the fourth pipe (C).