Abstract: A test-gas leak detector (1) includes a connection (27) for a device under test, a sniffer, or a leak detector chamber, a high-vacuum pump (2), a test-gas detector (5) that is connected on the intake side of said pumps, and a test-gas conduit (28) leading from the connection of the leak detector (27). The conduit is connected to at least one intermediate stage of the high-vacuum pump (2) in addition to the pre-vacuum zone of the high-vacuum pump (2) via conduit sections (31, 32, 35) and valves (33, 34, 36). A housing (9), in which at least some of the conduits and valves and the high-vacuum pump (2) are integrated, forms part of the leak detector (1) and a detachable slide-in module (51) forms part of the high-vacuum pump. The slide-in module has an external jacket construction (53) comprising passages (58, 61) and when the leak detector (1) is operational, is situated in a receiving opening (52) that is provided in the housing (9).

Abstract: A test-gas leak detector (1) includes a connection (27) for a device under test, a sniffer, or a leak detector chamber, a high-vacuum pump (2), a test-gas detector (5) that is connected on the intake side of said pumps, and a test-gas conduit (28) leading from the connection of the leak detector (27). The conduit is connected to at least one intermediate stage of the high-vacuum pump (2) in addition to the pre-vacuum zone of the high-vacuum pump (2) via conduit sections (31, 32, 35) and valves (33, 34, 36). A housing (9), in which at least some of the conduits and valves and the high-vacuum pump (2) are integrated, forms part of the leak detector (1) and a detachable slide-in module (51) forms part of the high-vacuum pump. The slide-in module has an external jacket construction (53) comprising passages (58, 61) and when the leak detector (1) is operational, is situated in a receiving opening (52) that is provided in the housing (9).

Abstract: A valve for safeguarding the outer container of a double wall vacuum-insulated container for low boiling liquified gases against a pressure increase in the insulation space after a loss of vacuum comprises a valve housing fastened in the outer container, a valve plug and an O-ring which, as a result of deformation, act as a sealing element between the valve housing and the valve plug. The dimensions of the valve housing and seal plug causing deformation of the O-ring in the radial direction and the influence of the outside air pressure causing simulataneous deformation in the axial direction.