Abstract: An anti-tampering bottle closure comprising an outer member in the form of a sleeve which is insertable into the neck of a bottle and an inner member in the form of a tubular valve body made of a substantially more rigid material than the sleeve. A ball valve is trapped within the valve body and adapted to allow liquid to be poured from the bottle when it is inverted but prevent liquid from being poured into the bottle when it is upright. The sleeve has a thickened wall portion and the valve body is axially insertable into the sleeve to compress the thickened wall portion against the neck of the bottle so as to resist radially inward deformation of the thickened wall portion of the sleeve and thereby lock the closure in the neck of a bottle. Preferably, the thickened wall portion of the sleeve forms an inwardly convex annular protrusion which is deformed outwardly into locking engagement with the bottle neck when the valve body is inserted into the sleeve.

Abstract: A device is provided which is non-removably mounted in the mouth of a bottle and which prevents or obstructs the addition of adulterating liquids to the contents of the bottle. The device includes a plastics tubular body 13 having detachably attached to its lower end a non-return valve comprising a ball 14 and a seating ring 15, and a baffle disc 18 formed integrally with the body covers the ball. The body 13 is secured in the bottle mouth by a flanged plastics collet 16 having at its lower end integral resilient tongues 31 which are forced into engagement with a shallow channel 11 on the internal surface of the neck by the act of pressing the body 14 and valve down into the position shown, the valve seating ring 15 having a frusto-conical external surface for this purpose. Upward movement of the body relative to the collet is prevented by a shoulder 22 on the body which comes into abutment with the lower ends of the tongues 31.