Abstract: A butterfly valve disc arrangement comprising a valve disc arranged to be rotatably movable between an open position and a closed position of a valve body, said valve disc comprising a circumferentially arranged recess disposed about a periphery of the valve disc; a sealing ring arranged in said circumferentially arranged recess of said valve disc and configured to provide a radial seal against an inner surface of said valve body when said valve disc is arranged in the closed position; and a resilient member arranged between a first surface of the circumferentially arranged recess and a first surface of the sealing ring for providing a seal between a second surface of the sealing ring and a second surface of the circumferentially arranged recess.

Abstract: A vehicle carried system for camouflage with foam includes a plant for generating water-based foam. The foam generating plant includes a reservoir for foaming liquid or a water tank with a reservoir for a foaming agent, which are connected to produce foaming liquid. The foaming liquid is pumped, or delivered in another way, under pressure to the foam generator for generating camouflage to be applied to the ground or to be filled into containers. Containers and free foam are preferably colored to give the protected object a good visual camouflage.