Abstract: A retractable cleaning nozzle for spray cleaning an interior surface of a pipe or a tank includes a nozzle housing configured to be stationary mounted in a hole of the side wall of the pipe or tank and having a front side arranged to face towards the interior of the pipe or tank and a rear side arranged to face away from the interior of the pipe or tank, an inlet port configured for receiving a cleaning fluid, and a cylindrical interior bore with a central axis defining an axial direction, wherein the interior bore is open towards the front side of the nozzle housing.

Abstract: A valve stem-plug and seal assembly includes a valve stem-plug having first and second axially spaced peripheral shoulders forming a groove there between. A floating seal gasket is arranged in the groove. The floating seal gasket is an annular ring with a central opening through which the valve stem-plug extends. Further, the outer surface of the floating seal gasket includes an upper and a lower circumferential extending segment, wherein the segments are arranged for sealing against a valve seat and thereby forming a double-contact seal. The outer surface of the floating seal is concave between the upper and lower circumferentially extending segments such that a leakage chamber is formed between the valve seat and said upper and lower circumferentially extending segments when the double-contact seal is formed. The floating seal gasket itself and a valve assembly in which the valve stem-plug and seal assembly is used are also disclosed.

Abstract: The Valve device comprises two paths communicating depending on the position of a movable valve which includes a first and a second flap one of which being hollow. A third flap is freely mounted between the first and the second flaps assisting either the first and second flap in sealing either path.