Thermostatic cartridge

Abstract

A thermostatic cartridge (1) has a hollow casing (10); a thermostatic element (30); a return spring (40); a slide valve (20) which is movably mounted inside a chamber (11) of the casing to regulate the respective amounts of cold fluid (F) and hot fluid (C) entering the chamber, and which is axially translatably coupled to a thermosensitive portion (31) of the thermostatic element; an end piece (50) against which a portion (32) of the thermostatic element, axially translatably actuated by the thermosensitive portion, is axially pressed under the action of the return spring; a nut (60), axiallytranslatably mounted inside the chamber while being rotatably linked to the casing; an overtravel spring (70), axially inserted between the end piece and the nut in order to rigidly connect the end piece and the nut axially, as long as the slide valve can be freely moved axially by the thermosensitive portion; and a screw (80), which is screwed into the nut while being locked against axial translation relative to the casing and which extends from inside the chamber to the outside of the casing via a bore (18) in the casing. The screw has a threaded portion (81) which is screwed inside the nut,and a first screw seat (83) disposed in the bore and which, inside the bore, is guided relative to the casing in order to align the screw with the axis. To limit the clearance of the screw, the latter further includes a second seat (84), which is separate from the threaded portion and the first seat, and which is arranged inside the chamber but outside the bore, the second seat being guided inside the chamber and relative to the casing such that the screw is aligned with the axis.

Description

Technical field [0001] The invention relates to a thermostatic cartridge. Background technique [0002] The present invention is particularly suitable for the sanitary field, and is therefore suitable for checking, for example, mixing faucets for sinks and showers, which can "mix" the incoming cold water stream and the incoming hot water stream, that is, combine to form a single outlet stream , Which is called "mixed water", the temperature is between the respective temperatures of hot and cold water. [0003] When the temperature of the mixed water can be set to a substantially constant and adjustable value independent of the respective pressure and temperature of the cold water and hot water, and the flow rate of the mixed water can be set within a certain pressure and flow rate range, such The mixer is said to be thermostatic. This thermostatic function is performed by a special device, which is basically arranged in a hollow housing to form a pre-assembled assembly, which is ...

AI Technical Summary

Problems solved by technology

[0006] Although this possible free play of the screw has no effect on the performance of the spool after it is placed under hydraulic pressure, customers who handle the spool before it is put into service will have a bad feeling: in fact, These customers have the impression that the adjustment mechanism is poorly assembled or damaged

Even after the spool is hydraulically pressurized, the screw maintains a certain amount of clearance, which may be considered a defect by the user

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