Abstract: The invention relates to a leak detector comprising a primary pump unit, a secondary pump unit having at least one secondary pump, a gas analyzer, a test module, a calibration module, a delivery module of the secondary pump unit, valves, and link segments. In the invention the leak detector includes a one-piece main block provided with spaces making it possible to integrate at least some of the component elements of the leak detector.

Abstract: A gas/liquid mixture passes through a duct in which a filter device is interposed, the filter device being disposed such that its outlet duct is essentially vertical. The outlet duct opens out into a collecting enclosure placed above the filter device. A side outlet duct from the enclosure is disposed below the level of the liquid collected in the enclosure, a top portion collecting the gas given off above the level. The top portion communicates with the inlet of a jet which reinjects the gas into the outlet flow so as to form a homogeneous gas/liquid stream. The invention may be used, in particular, in the lubrication circuit of a vacuum pump having vanes and oil seals.

Abstract: A Roots-type machine is connected to an enclosure to be evacuated via a suction inlet portion, and to a primary pump via a delivery outlet portion. A bellows is disposed transversely in the inlet portion, one end of the bellows being fixed in gastight manner in the wall, and the other end being closed and movable, so that the bellows forms a regulating member for regulating the gas-flow sectional area in the inlet portion. The outside face of the movable end of the bellows is subjected to the pressure in the inlet portion, and the inside face of the movable end is subjected to the pressure in the delivery outlet portion via a rod passing through the wall, and via a channel. The invention applies to Roots-type machines, in particular for automatically regulating the pumping speed so as to match it to the flow-rate of the corresponding primary pump.

Abstract: A pumping apparatus for pumping a gas having application to helium leak detectors has a vane and oil-seal type vacuum pump immersed in a closed tank (9) partially filled with oil (10). The apparatus also includes an oil pump (20) for renewing the oil seal located inside the tank. The oil pump is equipped with a noise-reducing mixing device enabling the oil for constituting the oil seal to be mixed with a noise-reducing gas. The noise-reducing gas is fed from the outside of the tank to the mixing device by means of a pipe (24) passing through the wall of the tank and opening via a Venturi tube to the suction duct of the immersed oil pump.

Abstract: An anti-return safety apparatus for an installation comprising a vacuum vessel connected to a vacuum pump having an oil seal, wherein the apparatus comprises a valve constituted by a rigid tube having a flexible tube situated therein with the two ends of the flexible tube being fixed in sealed manner to the ends of the rigid tube, a control orifice being provided through the wall of the rigid tube in the vicinity of the middle thereof, the valve being connected between the vessel and the suction inlet to the pump, and in that a slide valve suitable for establishing two different communication paths is provided suitable for establishing a connection between a common outlet C and one or other of two distinct inlets a, and b, the common outlet C being connected to the control orifice of the valve having the flexible tube, the inlet a being connected to the suction inlet of the pump, and the inlet b being opened to atmospheric pressure, the slide valve being electromagnetically controlled by a coil, itself contro

Abstract: A valve comprising a rigid tube in which a flexible tube is situated with the two ends of the flexible tube being connected in sealed manner to the ends of the rigid tube, a control orifice being provided through the wall of the rigid tube in the vicinity of its middle region, and a core also being disposed inside the flexible tube, the core being smaller in cross-section than the inside section of the tube when in the rest state, wherein the core has a calibrated internal passage. The valve is suitable for preventing hammer in an installation having two zones at different pressures P1 and P2.

Abstract: A valve which opens on reduced pressure comprises: a hollow body (1) divided into first and second portions (2 and 3) by an internal partition (4), with the first portion being provided with a first opening (5) for connection to an enclosure to be evacuated and with a second opening (6) for connection to the aspiration side of a vacuum pump; a moving valve plate (7) disposed inside the first portion; a spring (8) urging the valve plate to close the first opening; a rod (10) having one end connected to the valve plate and passing through the internal partition; and a piston (b 11) which is connected to the other end of the rod, and which divides the second portion into a first chamber (13) and a second chamber (14) which are sealed from each other, the first chamber being on the rod side of the piston and being in communication with the outside (19), and the second chamber including an orifice (22) for communication with the outside, which orifice is fitted with closure means (23), the second chamber further i

Abstract: Oil-sealed vane pump has a stator and a rotor assembly housed in an oil-filled tank, said stator comprising an oil injection orifice, a suction port connected to a tank inlet pipe and a discharge port opening into said tank, said discharge port being provided with a check valve, said check valve being mounted in a spot facing in the stator and said tank further comprising a discharge outlet. The stator is provided with at least one slot opening into the spot facing.