Cartridge for a mixing valve and process for its instrumental assembly

A cartridge including the operating mechanisms for a hydraulic equipment unit, functionally comprising an envelope,

• a bottom member connected to the envelope,
• a first operatively fixed plate made of a hard material and a second operatively movable plate, also made of a hard material, the plates being manufactured via the process of injection molding thermosetting materials such that the plates may be configured into complex shapes,
• a slide for guide and movement of the mobile plate, operating means,
• a support member for the operating means,
• a retaining cover and
• a plurality of packings necessary for sealing among said component parts and toward the outside, wherein at least one packing having a U-shaped cross section, is directly molded upon the projections presented by the first operatively fixed plate such that said packing also acts as the bottom member,
• characterized in that
• (a) the bottom member and the operatively fixed plate constitute a single structural element, forming a plate-bottom unit, which is produced by means of one of the processes for making plates of hard material that make it possible to confer to the plates relatively complex configurations;
• (b) the cartridge envelope has, close to its bottom end, an internal shoulder suitable for retaining the plate-bottom unit;
• and
• (c) the plate-bottom unit itself and all of the other component parts of the cartridge are so shaped as to be housed and mutually engaged in the cartridge envelope due to the effect of their introduction into the envelope according to the axial direction of the envelope and in the only direction that extends toward said bottom internal shoulder.