Abstract: A sealer (10) for vacuum containers comprises a valve unit (12) and a removable vacuum-pump head (14). The valve unit consists of a valve housing (24) which can be connected to a vacuum container to be evacuated, for example through a flange (16), and a cylindrical valve element (42) inserted into the valve housing. The valve element has a top transverse opening (46) for interaction with a driving tool, a middle transverse hole (48) for connection to a source of vacuum through the above-mentioned vacuum pump head when the latter is fitted onto the valve element, a bottom transverse hole (52), and an axial bore (50) which connects the middle transverse hole to the bottom transverse hole. The valve element also has a threaded portion (44) which engages an inner thread (36) formed in the valve housing, so that the valve element can be screwed into the valve housing, and can interact with saddle (40) in the valve housing.

Abstract: A valve with improved sealing properties comprises a housing (10a) with an inlet pipe (12a), an outlet pipe (16a) and a flange (54) which is closed by a first cover (52). An annular copper seal (24a) is placed between the flange (54) and the first cover. The first cover is closed with a thrust cover (60) which is connected to the flange by bolts (68) which pass through holes (64) in the first cover and are threaded to the flange. A valve stem (36a), a threaded portion (34a) of which is screwed into a central threaded opening (62), is inserted into the valve housing. The valve stem carries a valve head (38a) which is rotatable with respect to the valve stem and engages a valve seat 48a inside the housing. The threaded connection between the valve stem and the interior of the valve housing is sealed by a bellows (50a).