A vacuum valve, comprising - a valve body with a valve opening surrounded by a valve seat, - a closure member which is adjustable parallel to a longitudinal adjustment direction between an open position, in which it uncovers the valve opening, and an intermediate position, in which it covers the valve opening but is lifted off from the valve seat, and which is adjustable parallel to a transverse adjustment direction between the intermediate position and the closed position, in which it lies against the valve seat, - at least one valve stem bearing the closure member and lying parallel to the longitudinal adjustment direction, - at least one guide piece (15a, 15b), - a longitudinal-stroke drive, by which the at least one valve stem is displaceable parallel to the longitudinal adjustment direction in order to adjust the closure member between the open position and the intermediate position, - a transverse-stroke drive, by which the at least one guide piece (15a, 15b) is adjustable parallel to the transverse adjustment direction in order to adjust the closure member between the intermediate position and the closed position, and - at least one sliding part which is guided displaceably relative to the valve body by at least one primary linear guide and which is guided displaceably relative to the at least one guide piece (15a, 15b) by at least one secondary linear guide, wherein the primary and secondary linear guides (26, 27) are each at an angle of less than 45° relative to the longitudinal adjustment direction and the at least one primary linear guide encloses an angle of more than 3° and less than 45° with the at least one secondary linear guide, and wherein the at least one sliding part is displaceable by the transverse-stroke drive in order to adjust the at least one guide piece (15a, 15b) parallel to the transverse adjustment direction, characterised in that the at least one valve stem is guided displaceably parallel to the longitudinal adjustment direction by at least one guide piece (15a, 15b) and is displaceable in relation to the at least one guide piece (15a, 15b) by the longitudinal-stroke drive in order to adjust the closure member between the open position and the intermediate position. - a valve body with a valve opening surrounded by a valve seat, - a closure member which is adjustable parallel to a longitudinal adjustment direction between an open position, in which it uncovers the valve opening, and an intermediate position, in which it covers the valve opening but is lifted off from the valve seat, and which is adjustable parallel to a transverse adjustment direction between the intermediate position and the closed position, in which it lies against the valve seat, - at least one valve stem bearing the closure member and lying parallel to the longitudinal adjustment direction, - at least one guide piece (15a, 15b), - a longitudinal-stroke drive, by which the at least one valve stem is displaceable parallel to the longitudinal adjustment direction in order to adjust the closure member between the open position and the intermediate position, - a transverse-stroke drive, by which the at least one guide piece (15a, 15b) is adjustable parallel to the transverse adjustment direction in order to adjust the closure member between the intermediate position and the closed position, and - at least one sliding part which is guided displaceably relative to the valve body by at least one primary linear guide and which is guided displaceably relative to the at least one guide piece (15a, 15b) by at least one secondary linear guide, wherein the primary and secondary linear guides (26, 27) are each at an angle of less than 45° relative to the longitudinal adjustment direction and the at least one primary linear guide encloses an angle of more than 3° and less than 45° with the at least one secondary linear guide, and wherein the at least one sliding part is displaceable by the transverse-stroke drive in order to adjust the at least one guide piece (15a, 15b) parallel to the transverse adjustment direction, characterised in that the at least one valve stem is guided displaceably parallel to the longitudinal adjustment direction by at least one guide piece (15a, 15b) and is displaceable in relation to the at least one guide piece (15a, 15b) by the longitudinal-stroke drive in order to adjust the closure member between the open position and the intermediate position.