Abstract: A valve has a valve housing in which a closure element having at least one sleeve section is movable along its sleeve longitudinal axis by an actuator to open and close a fluid connection between a fluid inlet and outlet. The actuator has stationary and movable parts relative to the valve housing. At least the movable parts and the closure element are arranged entirely within an enclosed fluid space between the fluid inlet and outlet. To close the fluid connection spaced first and second seal devices of a double-sealed seat are in sealing contact with equally-spaced first and second counter-seal devices on the valve housing along first and second closed seating lines, respectively. With regard to the at least one double-seal seat, the ratio between first and second areas enclosed by first and second sealing lines in projection along the sleeve longitudinal axis, respectively, is between 6/10 and 10/6.

Abstract: A valve has a valve housing in which a closure element having at least one sleeve section is movable along its sleeve longitudinal axis by an actuator to open and close a fluid connection between a fluid inlet and outlet. The actuator has stationary and movable parts relative to the valve housing. At least the movable parts and the closure element are arranged entirely within an enclosed fluid space between the fluid inlet and outlet. To close the fluid connection spaced first and second seal devices of a double-sealed seat are in sealing contact with equally-spaced first and second counter-seal devices on the valve housing along first and second closed seating lines, respectively. With regard to the at least one double-seal seat, the ratio between first and second areas enclosed by first and second sealing lines in projection along the sleeve longitudinal axis, respectively, is between 6/10 and 10/6.