Valve to be mounted in a housing.

摘要

1. A sealing unit such as a safety valve to be mounted in a body (1) provided with a seat (6), comprising, for its automatic opening, a flap valve (8), which is formed by cup (9) accommodating a seal (10), which is held fast against the base (11) of the cup (9) by a securing means (12), the flap valve resting with the said seal (10) on the seat (6) under the action of a spring (13), which rests on the opposite face (14), called the rear face, of the flap valve, and which extends upwards in the chamber (2) of the body (1), such that the upper portion of the spring (13) also rests beneath an abutment (17), which is connected to the body (1) in an adjustable manner by any known means, such as a threaded joint, comprising, for its manual opening, a manual lifting rod (21), the foot (22) of which is held fast in a housing (23) arranged at the said rear face of the flap valve, and which, after freely passing through the spring and the abutment (17), has its head gripped by a key (24), the said securing means (12), which holds fast the seal (10) against the base (11) of the cup (9), being formed by a flange (28) supported by a finger (29), which ; on the one hand, axially penetrates both a central bore disposed in the seal (10), and the cup (9), and on the other hand, bears the axial housing (23), which receives the foot (22) of the manual lifting rod (21), which is held fast therein, the said rod (21) having, to this end, a transverse dimension at the level of the end (30) of the axial housing (23), which, at least locally, is less than that of the foot (22), the said finger (29) of the securing means (12) having in its portion (32) which penetrates the seat (10), a diameter which is larger than in its middle portion (33) penetrating the cup (9), and which is larger than the diameter of the bore of the said cup, such that the free-cut face (34) separating the two portions (32, 33) abuts against the base (11) of the cup, the said unit being characterized in that ; at its end, the finger (29) of the securing meaéns (12) comprises a tubular portion (30), in order to form the axial housing (23) for the foot of the rod (22), after assembly, the edge (31) of the tubular portion (30) of the finger (29) is turned inwards towards the rod until the opening of the axial housing has a transverser dimension which is less than that of the foot (22) of the rod, the tubular portion (30) of the finger (29) has a diameter which is less than the middle portion (33) penetrating the cup (9), and in the free-cut face (35) separating the two portions (30, 33) of the finger, an annular groove (36) is cut, which, in the middle portion (35), defines the end of a tubular wall (37), which, after assembly, is folded back behind the edge of the central bore of the cup (9).