ONE-WAY FREE-FLOWING MATERIAL FEED VALVE Russian patent published in 2008 - IPC B65D47/20 

FIELD: engines and pumps.

SUBSTANCE: inventions relates to a one-way valve feeding a free-flowing material from a vessel, susceptible to reduction in volume, provided with a cover set onto the vessel neck with the material outlet. The valve seat is arranged in the said vessel neck while its base body bears against the vessel neck inner wall. The said valve has, at least, one through hole and a boss passing axially through the vessel neck towards the outlet, and a seal. The said seal is made from an elastic material and has a circular section that shuts off at least one through hole, and a sleeve-like section enveloping the boss with a minor radial gap except for the boss end part which, with the one-way valve closed, bears against the boss end part in the outlet hole. A sterilising element made of silver or any other oligodynamic effect metal may be arranged in an intermediate space between the valve seat boss and elastic seal. Bringing pressure on the vessel content makes the seal circular section opening, at least, one through hole and the sleeve-like seal end section extending from the outlet to clear it. Now, the seal goes back to its initial position.

EFFECT: vessel content is securely tight to prevent the penetration of harmful substances.

16 cl, 9 dwg