Abstract: A vacuum pump with a circular translation cycle includes a fixed body (100) having a fixed disk (114) which is provided on at least one of its sides with a spiral-shaped protuberance (123), a movable disk (131) opposite to the stationary disk (114) and having also at least one spiral-shaped protuberance (133) interleaved with the spiral protuberance (123) of the fixed disk (114) and having the same angular amplitude, a mechanism by means of which the moveable disk (131) is connected to the body (100) and supported thereby in order to control a circular translation motion of the moveable disk (131) with respect to body (100), a motor (120) for driving the moveable disk (131) through a pump shaft (140), and a pump having a limiter device for limiting the circular translation motion. The mechanism includes two bearings (182, 190) carried by the pump shaft (140), which is in a central position with respect to the fixed body (100).

Abstract: A vacuum pump with circular translation cycle comprises a stationary body (10) with a stationary disc (13, 14) that includes, at least on one side thereof, a spiral-shaped projection (23, 24, 25), a movable disc (30) facing the stationary one (13, 14) and also including at least one spiral-shaped projection (33, 34, 35) interleaved with the projection (23, 24, 25) of the stationary disc (13, 14) and with the same angular range, a mechanism connecting the movable disc (30) to the body (10) so that it is supported thereby and controlling the circular translational motion of the movable disc (30) in relation to the body (10), and actuating unit (20) for driving the movable disc (30) by a pump shaft (50) that is centrally located in relation to the stationary body (10), the mechanism comprising at least one bearing (47) supported by the pump shaft (50) . The pump also includes a device for limiting undesirable travel in the circular translation of the disc, the device being a metallic bellows (60).

Abstract: A sealed transmission device for controlling a valve including a casing containing a transfer member coupled to a control shaft and to a receiver shaft. A bellows surrounds the receiver shaft and is fixed and sealed at its upper end to the transfer member and is fixed and sealed at its lower end to the casing. The transfer member is operably connected to a tilting member, which tilting member is adapted to protect the bellows from the effects of torsion due to rotation of the control shaft.

Abstract: A sealed rotary transmission device comprises a control shaft and a receiver shaft parallel to and spaced from the control shaft. A bellows surrounds the receiver shaft, and has one end fixed in a sealed way to a casing of the device. The device also includes a transfer member constrained to move parallel to a plane perpendicular to the receiver shaft. The other end of the bellows is fixed to this transfer member in a sealed way. On each of the control and receiver shafts is a respective crank, eccentric to its axis by the same distance. These cranks are coupled to the transfer member and spaced by the same distance as the shafts. This enables circular translation of the transfer member.

Abstract: A completely dry fluid-tight reciprocating vacuum pump comprises one or more pumping chambers defined between two rigid parts which face one another in the axial direction. One is reciprocated in a straight line relative to the other. They are connected to one another by at least one axially flexible member of appropriate radial stiffness. Each of these members comprises an outside part fixed to a first of these rigid parts. The side of the first rigid part facing the flexible member is shaped to have a profile in diametral cross-section which is substantially the same as the profile in diametral cross-section that this member tends to assume, by virtue of its stiffness, in the configuration with the aforementioned rigid parts moved towards one another. The pump can be used for pumping corrosive and radioactive gases, such as tritium, for example.