Pressure switch valve, for hydraulic vehicle brake systems with traction control (ASR)

A pressure switch valve, for hydraulic vehicle brake systems with traction control (ASR), comprising a cylindrical chamber (16), having an inflow conduit and an outflow conduit for pressure fluid, a longitudinally movable valve closing first ball (18) and a second ball (19) in axial alignment in said cylindrical chamber, a compression spring (20) in contact with said second ball (19) that applies an axial force directly on said second ball and indirectly on said closing first ball in which said closing first ball cooperates with a valve seat (8), said closing first ball (18), said second ball (19) and said compression spring are received in said cylindrical chamber (16) with slight radial play and disposed along a longitudinal axis of said cylindrical cylinder, and said closing first ball (18) engages the valve seat (8), said second ball (19) is supported on the first ball (18), under the influence of the compression spring (20) specifically on a side remote from the valve seat (8), an outflow conduit (23) which branches off from the cylindrical chamber (16) at a point such that upon switching of the pressure switch valve (1) and movement of the first ball such that a plane (25) normal to a longitudinal axis (17) of said cylindrical chamber (16) and through a spherical center of the closing first ball (18), does not reach a mouth cross section of the outflow conduit (23) until after a corresponding plane (24) relative to said second ball (19) has already passed beyond the mouth cross section of said outflow conduit (23).