Abstract: A cylindrical housing (1) and a body (4) having a shape matching the shape of the housing (1). The body (4) is immobilized, so as to compress the elastically compressible part (3), by a split ring (6) placed in a groove (7) of the cylindrical wall of the housing (1). The shape and dimensions of the ring (6) are selected in such a way that it bears against a peripheral surface of the body (4) in order to prevent it from moving outwards. The ring (6) is locked in the groove (7) by a collar (8) having zones (82) which, by virtue of their shape, prevent the ring (6) from moving out of the groove (7) and bulges (81) interacting with a groove (41) of the body (4) for the fixing by snap-fitting of the collar onto the body.

Abstract: The object of the method is to form a restraint intended to retain a split ring 5 for fixing a part, in particular a circular part 3 on an internal bearing surface 4 of the tubular part. The method consists in deforming a thinned portion 7 of the tubular part by means of a tool 9 using the split ring 5 as a means for forming the restraint.

Abstract: The three-way valve has a chamber in the body which is adapted to provide a connection from an outlet passage to both inlet passages. One inlet passage is closed by a valve lid which bears on a valve seat and which functions as an automatic outlet valve when the armatures moves into a top position. The other valve lid moves independently in dependance on the inlet pressure of the second inlet passage and the pressure in the outlet passage. In the illustrated rest position, the armature acts by way of a convex closure member to press the lower valve lid onto a valve seat about the second inlet passage.

Abstract: A valve with four passages controls a piston (15) disposed in a cylinder (16). Between the body (1) of the valve and the cylinder (16) is disposed a plate (23) having passages (24, 25) which are used and a passage (26) which is not used in FIG. 1. By turning plate (23) 180.degree., the passage (24) is located in the non-use position, while the passage (26) connects the conduits (19 and 13) in such a way as to cause the space (21) of the cylinder (16) to communicate continuously with an exhaust orifice (6).