Abstract: The invention relates to a safety device that ensures longitudinal sealing of the shaft of a primary pump following the rupture of one of the seals separating the high-pressure chamber from the low-pressure chamber of the fluid in the pump, the device made up of a hollow piston comprising an upstream side part of outer diameter D1, and a downstream side part of outer diameter D3, greater than D1, the piston coaxially surrounding the shaft and being placed in a chamber made in the seal housing, the device also comprising activation means which axially move the piston against the shaft when a seal ruptures, wherein two annular chambers are made on the downstream side of the piston, the first, whose outer diameter D2 is greater than D1, communicating with the low-pressure chamber.

Abstract: The invention relates to devices for anchoring one part (P) relative to another (M) comprising a nut (4) and a conical ring (5), the base (1) of the part to be anchored (P) made up of first part (2) around which said nut (4) passes and a second truncated cone shaped part (3) receiving the conical ring (5), a hole (6) in the anchoring part (M) receiving the base (1) and its conical ring (5), the bottom of said hole (6) being provided with spring washers (9).