Abstract: Improvement in pneumatic sensors for the control of pneumatic cycles, in which a liquid jet vacuum pump is supplied at the input by a compressed air circuit and connected at the output to a nozzle of which the obturation provokes a rise in pressure in the vacuum pump used as signal for controlling a pneumatic component. The space 4 comprised between the jets 2, 3 of the vacuum pump is connected on the one hand to an output orifice 14 emitting the control signal and on the other hand to an airing valve 13b which, open during the ejection leakage, admits the atmospheric pressure in the space 4, the output 14 and the duct 15 preventing the creation of a depression and which is closed during obturation of the leakage. The invention is used for the control of pneumatic cycles.

Abstract: The present invention relates to improvements in pipe fittings and in particular to fittings for high pressure fluid pipes, the said fittings of the crimping ring type comprising a rigid body provided with a bore and, at one of its ends, a threaded outer part on which is screwed a rigid nut.The part 3 forming a tight seal cooperates with the gripping part 4 which has several functions: the thin lip 4a is pushed by the seal and comes into close contact with the pipe 5 thereby producing a perfect seal anti-extrusion means, and the conical part 4d locked by tightening determines on the conical part 1d of the body a second perfect seal anti-extrusion means, the face 4e being in resting contact on the face 1b of the body and limiting the tightening of the seal; the rear part of the ring 4 produces the direct clamping of the pipe.The invention finds an application to ensure the reliable tightness of high pressure pipes.