Patent ID: 9004094
Filing Date: 2015-04-14
Classification: F16K,Y10T

Abstract:
1. A system for injecting dry powder into a wet environment, the system comprising: a mixing vessel containing liquid under vacuum conditions, the liquid having a liquid surface; and a valve connected to a powder feed pipe for feeding powder into the valve and connected to the mixing vessel at a level under the liquid surface, such that the valve is in contact with the liquid, and the valve, when open, connecting the powder feed pipe with the liquid for supplying powder from the powder feed pipe into the liquid under the action of vacuum in the mixing vessel, wherein by closing the valve a valve closing body, in a closed position, extends from a piston through a first valve seat of the valve and into the wet environment, and wherein by opening the valve, the valve is adapted to allow air to flow in a space between the piston and a second valve seat.