Patent Description:
The present invention further relates to an electromagnetic valve having a tubular element according to the present invention assembled to the valve body.

It is known that electromagnetic valves comprise a tubular element removably connected to the valve body. In particular, tubular elements are known which comprise: a housing, adapted to internally receive a core and allow it to slide therein; and a connection portion, adapted to be removably fixed to the valve body.

In the current state of the art, said tubular element is made as one monolithic piece, in which both said housing and said connection portion are formed.

It is also known that there is a tendency in the industry to reduce the costs and the number of parts that have to be assembled when manufacturing components for electromagnetic valves. Therefore, there is currently in the art a bias against manufacturing components that are normally made as one monolithic body as multiple parts to be then assembled together, since there is an increasing demand for reducing production and assembly costs.

The current state of the art does not consider the possibility of recovering parts of the electrovalve in a simple and quick manner, should it turn out to be unsuitable for use.

It must also be pointed out that the fixing of the tubular element to the valve body may vary from case to case as needed; for example, it may be achieved by interlocking or by means of a bayonet and/or threaded connection.

The fixing of the tubular element to the valve body must be such as to ensure hydraulic tightness while at the same time not affecting the proper operation of the valve element. In fact, in electromagnetic valves comprising a diaphragm element, which interacts, even only partially, with said tubular element, the movements for sealingly fasten such tubular element to the valve body should not jeopardize the proper operation of such diaphragm element. A technical problem known in the prior art relates to the need for preventing such diaphragm element from becoming deformed, e.g. twisted, when said tubular element is fastened to the valve body. This problem is particularly felt in implementations wherein said tubular element is screwed onto the valve body.

There is also an increasing demand for facilitating the assembly of the tubular element, ensuring that the core can position itself correctly while preventing it from jamming or sticking.

Patent <CIT> discloses an electrically operated valve for clothes washing and dish washing machines which comprises a body provided with water intake and discharge connections and a seat for a diaphragm closure member, and a solenoid capable of controlling the closure member by means of a movable system, the closure member being mounted on a hollow member in a single functional unit which encloses the movable system, said functional unit being fixed to the body of the valve by means of a ring which is screwed in an internal threaded portion of the body to clamp the peripheries of the member and of the diaphragm against the valve body.

In general, the present invention aims at solving these and other technical problems by providing a tubular element in which the housing and the connection portion have two distinct bodies that can be removably connected to each other to form an assembly.

One aspect of the present invention relates to a tubular element for electromagnetic valves having the features set out in the appended claim <NUM>.

A further aspect of the present invention relates to an electromagnetic valve having the features set out in the appended claim <NUM>.

Auxiliary features are set out in respective dependent claims appended hereto.

The features and advantages of the tubular element and electrovalve will become clear and apparent in light of the following description of several possible embodiments of the tubular element and electrovalve, provided herein by way of non-limiting example, as well as from the annexed drawings, wherein:.

With reference to the above-listed figures, reference numeral <NUM> designates as a whole a tubular element for electromagnetic valves according to the present invention, whereas reference numeral <NUM> designates as a whole an electromagnetic valve according to the present invention.

Tubular element <NUM> is particularly suitable for application to electromagnetic valves <NUM>. In particular, said tubular element <NUM> is adapted to be assembled to a valve body <NUM> comprised in an electromagnetic valve <NUM>.

Tubular element <NUM> according to the present invention comprises: a housing <NUM>, adapted to internally receive a core <NUM> and allow it to slide therein for switching said electromagnetic valve <NUM>; and a connection portion <NUM>, which is adapted to be removably fixed to said valve body <NUM> for assembling tubular element <NUM> to said valve body <NUM>.

In the preferred embodiment of tubular element <NUM> according to the present invention, said housing <NUM> has a body <NUM> which is separate from and independent of said connection portion <NUM>, the latter having in turn a body <NUM> of its own, in particular separate from and independent of said body <NUM> of tubular element <NUM>.

Said body <NUM> of said housing <NUM> is connectable, in a removable manner, to said body <NUM> of connection portion <NUM>, thereby forming an assembly.

The present solution makes it possible to obtain said tubular element <NUM> from two bodies that can be removably connected to each other.

Moreover, the present invention permits recovering at least one of the two bodies of the tubular element in case said tubular element <NUM> and/or electromagnetic valve <NUM> is not fully compliant with the specifications and must therefore be discarded. The present solution makes it possible to reuse at least one body (<NUM>, <NUM>) in another assembly of said tubular element <NUM> to be assembled to another valve body <NUM>.

In addition, said housing <NUM> and said connection portion <NUM> are not merely two independent elements, but are advantageously adapted to interact with each other, becoming an assembly even when tubular element <NUM> is a separate part not yet assembled to valve body <NUM>.

In an embodiment of tubular element <NUM> according to the present invention, said body <NUM> of connection portion <NUM> has an annular structure. Such an embodiment allows placing said body <NUM> of connection portion <NUM> around body <NUM> of housing <NUM>; for instance, body <NUM> of housing <NUM> can be suitably inserted into the hole defined by annular body <NUM> of connection portion <NUM>, e.g. by making a movement along the axis that defines the longitudinal extension of said housing <NUM>.

In a preferred embodiment of said connection portion <NUM>, and in particular of body <NUM>, it is adapted to be fastened to valve body <NUM> by means of an at least partly rotational movement. In such an embodiment, said body <NUM> of connection portion <NUM> has an annular structure.

More generally, the connection of connection portion <NUM> to pvalve body <NUM> by means of an at least partly rotational movement can be achieved by means of a bayonet connection or by means of threaded portions or other connection systems comprising at least one at least partly rotational movement.

In a preferred embodiment of tubular element <NUM> according to the present invention, the removable connection between said body <NUM> of housing <NUM> and body <NUM> of connection portion <NUM> is such that the movements imparted to connection portion <NUM> will not jeopardize the proper operation of one or more diaphragm elements <NUM> comprised in valve body <NUM>.

In an even more preferable embodiment, the removable connection between said body <NUM> of housing <NUM> and body <NUM> of connection portion <NUM> is such that at least the rotational component of a movement of said body <NUM> of connection portion <NUM>, for removably fixing tubular element <NUM> to valve body <NUM>, is not transmitted to body <NUM> of said housing <NUM>. The present embodiment makes it possible to prevent that, in electromagnetic valves <NUM> comprising a diaphragm element <NUM> interacting, at least partly, with said tubular element <NUM>, and in particular with said housing <NUM>, e.g. with said body <NUM> of housing <NUM>, such diaphragm element <NUM> might be adversely affected, e.g. twisted, by the rotational component of the movement made by said connection portion <NUM>.

In a preferred embodiment of tubular element <NUM> according to the present invention, said body <NUM> of connection portion <NUM> comprises a threaded portion <NUM>. Said threaded portion <NUM> is located on the outer edge of the annular structure of said body <NUM>. In such an embodiment, connection portion <NUM> permits fastening tubular element <NUM> onto valve body <NUM> by screwing said connection portion <NUM>. In particular, in the preferred embodiment the rotational movement of said body <NUM> of connection portion <NUM> for threadedly fixing tubular element <NUM> to valve body <NUM> is not transmitted to body <NUM> of said housing <NUM>. The present embodiment prevents such rotational movement from being transferred to a diaphragm element <NUM> comprised in a valve body <NUM> of an electromagnetic valve <NUM>. It has been observed, in fact, that such rotational movements imparted to a diaphragm element <NUM> may twist, even only partly, such diaphragm element <NUM>, thereby impairing its sealing function. This problem is particularly important in indirect electromagnetic valves <NUM>, wherein said diaphragm element is particularly sensitive and, should it undergo any distortion, may no longer ensure a proper sealing in case of low pressure of the liquid flow entering electrovalve <NUM>.

Describing now more in detail the construction of an embodiment of tubular element <NUM> according to the present invention, body <NUM> of housing <NUM> comprises a cylindrical portion <NUM> and a sealing portion <NUM>.

Said cylindrical portion <NUM> has a distal end, which is closed, and an open proximal end.

The distal end of cylindrical portion <NUM> is that end which is farthest from valve body <NUM> and from connection portion <NUM> when tubular element <NUM> is assembled to valve body <NUM>; conversely, the proximal end of cylindrical portion <NUM> is that end which is closest to valve body <NUM> and to connection portion <NUM> when tubular element <NUM> is assembled to valve body <NUM>.

According to the invention, said sealing portion <NUM> is adapted to act, at least partly, upon a diaphragm element <NUM> comprised in electromagnetic valve <NUM>.

In a preferred, but merely illustrative and non-limiting embodiment in which said electromagnetic valve <NUM> is an indirect valve, said diaphragm element <NUM> is adapted to be arranged in a seat defined by said sealing portion <NUM>, in connection with said sealing portion <NUM>. In such an embodiment, said sealing portion <NUM> advantageously has a circular profile defining a dome-shaped structure that joins said cylindrical portion <NUM> of housing <NUM>. This embodiment facilitates assembling tubular element <NUM> and diaphragm element <NUM> to valve body <NUM>.

In the embodiment in which said electromagnetic valve <NUM> is a direct valve, said sealing portion <NUM> is adapted to define at least one stopper element, in the form of a shutter, for diaphragm element <NUM>.

More generally, said sealing portion <NUM> is located at the open proximal end of cylindrical portion <NUM>.

Preferably, said sealing portion <NUM> has a tapered shape, e.g. a dome-like shape, for connecting said cylindrical portion <NUM> to said connection portion <NUM>, thereby providing a removable connection between said connection portion <NUM> and said housing <NUM>.

According to the invention, said sealing portion <NUM> comprises connection means <NUM>. Said connection means <NUM> are adapted to removably connect said body <NUM> of housing <NUM> to body <NUM> of connection portion <NUM>.

Such connection means <NUM> make it possible to removably connect said body <NUM> of connection portion <NUM> to said body <NUM> of housing <NUM>, thereby obtaining an assembly, while at the same time preventing the rotational component of the movements of said body <NUM> of connection portion <NUM> from being transmitted to body <NUM> of said housing <NUM>.

In such an embodiment of tubular element <NUM> according to the present invention, said body <NUM> of connection portion <NUM> has an annular structure; in particular, said body <NUM> defines the edges of a central through hole.

According to the invention, connection elements <NUM> are comprised on at least a portion of the inner edge of said annular structure of body <NUM>, which are preferably arranged along a circumference.

Said connection elements <NUM> are adapted to cooperate with said connection means <NUM> of housing <NUM> to obtain the removable connection. This embodiment allows preventing the rotational components of the motion of body <NUM> of connection portion <NUM> for removably fixing tubular element <NUM> to valve body <NUM> from being transmitted to body <NUM> of said housing <NUM>.

In a preferred embodiment, the combination of connection elements <NUM> and connection means <NUM> provides a constraint preventing any mutual movements of housing <NUM> and connection portion <NUM> along a longitudinal axis of tubular element <NUM> while however allowing housing <NUM> and connection portion <NUM> to freely rotate relative to each other about the same longitudinal axis of tubular element <NUM>.

In one possible embodiment, said connection means <NUM> consist of an undercut formed on the outer surface of said sealing portion <NUM>, e.g. defining an annular guide. In the same embodiment, said connection means <NUM> are a plurality of protrusions formed in a portion of the inner edge of the annular structure of body <NUM> of connection portion <NUM>, preferably arranged along a circumference. The present embodiment facilitates assembling together body <NUM> of housing <NUM> and body <NUM> of connection portion <NUM> and separating such two bodies in case of need. Furthermore, the present embodiment allows body <NUM> of connection portion <NUM> to rotate relative to body <NUM> of housing <NUM>, thereby preventing a rotational motion imparted to body <NUM> of connection portion <NUM> from being transmitted to body <NUM> of rhousing <NUM>.

Describing now in more detail the construction of a preferred, though merely illustrative and non-limiting embodiment of tubular element <NUM> according to the present invention, the annular structure of body <NUM> of connection portion <NUM> defines gripping elements <NUM>. Said gripping elements <NUM> are adapted to allow imparting the at least partly rotational movement to connection portion <NUM> for removably fixing tubular element <NUM> to valve body <NUM>.

Preferably, said gripping elements <NUM> make it possible to screw said connection portion <NUM> onto valve body <NUM> in order to assemble tubular element <NUM> to said valve body <NUM>.

Describing now a preferred embodiment in more detail, said gripping elements <NUM> are slots formed in annular body <NUM> of connection portion <NUM>, in particular arranged radially, which facilitate the exertion, e.g. by means of a tool, of a force on said gripping elements <NUM> to impart a rotational movement to said connection portion <NUM>.

In the present embodiment, aiming at reducing the weight and the amount of material needed for producing connection portion <NUM>, said gripping elements <NUM> are through slots.

Preferably, said gripping elements <NUM> are arranged in a portion of body <NUM> of connection portion <NUM> where they cannot interfere with said connection elements <NUM> and where they cannot hinder the removable connection between said body <NUM> of said housing <NUM> and said body <NUM> of connection portion <NUM>; for example, they are arranged in a higher position along the longitudinal extension of said tubular element <NUM>.

More generally, housing <NUM> of tubular element <NUM> according to the present invention comprises a locking system <NUM>. Said locking system <NUM> is adapted to lock a coil <NUM>, comprised in electromagnetic valve <NUM>, around cylindrical portion <NUM> of housing <NUM>.

Said locking system <NUM> is adapted to assume at least two distinct configurations, i.e. a first configuration, in which it allows said coil <NUM> to be positioned around and/or removed from said at least a portion of housing <NUM>; and a second configuration, different from said first configuration, in which it locks said coil <NUM> around said at least a portion of housing <NUM>, in particular around said cylindrical portion <NUM>.

In one possible embodiment, said locking system <NUM> is either reversible, i.e. it allows switching from one configuration to the other, or non-reversible, i.e. said locking system <NUM> is designed to prevent, once said second configuration has been assumed, returning to said first configuration.

In one possible embodiment of tubular element <NUM> according to the present invention, a locking system <NUM> is integrated at the distal end of cylindrical portion <NUM> of body <NUM> of housing <NUM>. Said locking system <NUM> is adapted to lock coil <NUM>, comprised in electromagnetic valve <NUM>, around cylindrical portion <NUM> of housing <NUM>.

Preferably, said locking system <NUM> has, in said first configuration, an outside diameter of a known value, allowing said coil <NUM> to be positioned around and/or removed from cylindrical portion <NUM>; whereas in said second configuration the outside diameter of said locking system <NUM> is greater than said known value, thus locking said coil <NUM> around cylindrical portion <NUM> of housing <NUM>. In a preferred embodiment, said locking system <NUM> is adapted to remain in said first configuration until it is brought into said second configuration, e.g. through the application of an external force. Preferably, said locking system <NUM> can no longer, once it has assumed said second configuration, be returned into said first configuration without irreversibly damaging the structure and impairing the operation of locking system <NUM> itself.

Alternatively, said locking system <NUM> is located in a central portion of cylindrical portion <NUM> of body <NUM>, with reference to the longitudinal axis of tubular element <NUM>. Moreover, said locking system <NUM> may consist of one or more protrusions protruding from the outer surface of cylindrical portion <NUM>.

In another alternative embodiment, said locking system <NUM> comprises flexible elements arranged at the distal end of cylindrical portion <NUM> of body <NUM> of housing <NUM>, which are adapted to become deformed and lock said coil <NUM> around cylindrical portion <NUM> of housing <NUM> when said coil <NUM> is first fitted around pcylindrical portion <NUM>.

More generally, said locking system <NUM> may be made as one piece with said cylindrical portion <NUM>, e.g. said locking system <NUM> and said housing <NUM> being a monolithic body. As an alternative, said locking system <NUM> is a separate element that can be removably assembled to cylindrical portion <NUM> of housing <NUM>.

<FIG> shows an exploded view of a first possible embodiment of tubular element <NUM> according to the present invention. In this figure, one can see that connection portion <NUM> has a body <NUM> which is distinct and separate from body <NUM> of housing <NUM>. Also, <FIG> shows the annular shape of body <NUM> of connection portion <NUM>, on the outer edge of which there is a threaded portion <NUM>.

Said annular body <NUM> also defines a plurality of gripping elements <NUM>, in the form of through slots arranged radially.

On the inner edge of body <NUM> there are connection elements <NUM> adapted to cooperate with said connection means <NUM> of housing <NUM> to obtain a removable connection. Said connection means <NUM> are provided on the outer edge of the sealing portion <NUM> in the form of a circular groove or guide, in which said connection elements <NUM> of connection portion <NUM> can perform their function.

On top of sealing portion <NUM> there is said cylindrical portion <NUM>, defining said monolithic body <NUM> of housing <NUM>.

At the distal end of cylindrical portion <NUM> one possible embodiment of locking system <NUM> is comprised, which is integrated into body <NUM> of housing <NUM>.

<FIG> shows a perspective view of tubular element <NUM> of <FIG> in the assembled condition. In this figure one can see that housing <NUM> has been inserted into the hole defined by annular body <NUM> of connection portion <NUM>, thus forming an assembly. The figure also shows further construction details of both body <NUM> of housing <NUM>, particularly cylindrical portion <NUM>, and body <NUM> of connection portion <NUM>. In particular, the drawing shows in more detail the shape of the slots that define said gripping elements <NUM> and the shape of threaded portion <NUM>.

<FIG> shows an exploded view of a second possible embodiment of tubular element <NUM> according to the present invention. In this figure one can see that connection portion <NUM> has a body <NUM> which is distinct and separate from body <NUM> of housing <NUM>. In particular, said connection portion <NUM> has an annular body <NUM>, on the outer edge of which there is a threaded portion <NUM>.

Said annular body <NUM> also defines a plurality of gripping elements <NUM>, in the form of through slots arranged radially, and a plurality of connection elements <NUM> located on the inner edge of body <NUM>.

This figure also shows a housing <NUM> comprising a sealing portion <NUM>, on the outer surface of which an undercut guide is formed, which defines said connection means <NUM> that cooperate with said connection elements <NUM> of body <NUM> of connection portion <NUM> to provide the removable connection.

In a central portion of cylindrical portion <NUM>, one possible embodiment of locking system <NUM> is comprised. In this embodiment, locking system <NUM> is integrated into body <NUM> of housing <NUM>. In the present embodiment, said locking system <NUM> is at least one protrusion adapted to interact with a housing provided in said coil <NUM> to allow locking said coil <NUM> around said housing <NUM>.

Tubular element <NUM> according to the present invention is particularly suitable for being assembled to an electromagnetic valve <NUM>.

More generally, tubular element <NUM> is particularly suitable for being included in an electromagnetic device, preferably comprised in a household appliance, e.g. washing machines, dishwashers, refrigerators, ovens, etc., or in components and/or devices adapted for use in such household appliances, in accordance with the present invention. Said electromagnetic device is, for example, a pump, a switching valve, etc..

In the following part of the present description, reference will be made to an electromagnetic valve <NUM>, but the concepts and/or components comprised and described therein may also be applicable, wherever appropriate, to a generic electromagnetic device.

Said electromagnetic valve <NUM> is in turn particularly suitable for use in household appliances such as, for example, washing machines, dishwashers, ovens, etc., or in components and/or devices adapted for use in such household appliances.

In general, said electromagnetic valve <NUM> comprises a valve body <NUM>. Said valve body <NUM> comprises in turn at least one inlet <NUM>, e.g. only one or two or more, which is adapted to be connected to a supply duct, e.g. the water mains; at least one outlet <NUM>, e.g. only one or two or more, adapted to be connected to a duct of a downstream circuit, and at least one connection tract <NUM> adapted to hydraulically connect said at least one inlet <NUM> to said at least one outlet <NUM>.

Said valve body <NUM> may be the structure of an individual electromagnetic valve <NUM>, or may be incorporated into another device or in a circuit, e.g. a water softener, a regeneration circuit, etc..

Said electromagnetic valve <NUM> further comprises at least one diaphragm element <NUM>, arranged in a seat <NUM> formed in said connection tract <NUM>. Said diaphragm element <NUM> is adapted to selectively allow a flow of fluid between said at least one inlet <NUM> and said at least one outlet <NUM> of valve body <NUM>.

Said electromagnetic valve <NUM> further comprises a tubular element <NUM> according to the present invention, adapted to be removably connected to said valve body <NUM> while ensuring hydraulic tightness, e.g. in cooperation with said diaphragm element <NUM>.

Said electromagnetic valve <NUM> further comprises a core <NUM>, made of ferromagnetic material or composite material or any other material suitable to interact with electromagnetic fields generated by said coil <NUM>. Said core <NUM> is adapted to slide within tubular element <NUM> and cooperate with said diaphragm element <NUM>, whether directly or indirectly, in order to selectively allow a flow of fluid between said at least one inlet <NUM> and said at least one outlet <NUM> of valve body <NUM>.

As aforementioned, said electromagnetic valve <NUM> comprises a coil <NUM>. Said coil <NUM> is arranged around said tubular element <NUM>, in particular around said cylindrical portion <NUM>. Said coil <NUM> is adapted to generate a magnetic field capable of selectively moving said core <NUM>.

Within tubular element <NUM> an elastic element, e.g. a spring, preferably a coil spring, may be advantageously positioned, which is adapted to allow said core <NUM> to return into a predetermined position following the action of the magnetic field generated by said coil <NUM>.

In a preferred, but merely illustrative and non-limiting, embodiment of electromagnetic valve <NUM> according to the present invention, said tubular element <NUM> according to the present invention is adapted to be screwed onto said valve body <NUM>.

In other alternative embodiments, said tubular element <NUM> according to the present invention is adapted to be assembled to said valve body <NUM> by means of a bayonet connection or an interlocking connection.

In one possible embodiment, said electromagnetic valve <NUM> according to the present invention is an indirect valve.

<FIG> shows, in a sectional view relative to a vertical plane, one possible embodiment of an electromagnetic valve <NUM> according to the present invention, comprising a tubular element <NUM> according to the present invention.

The drawing shows a valve body <NUM> having at least one inlet <NUM>, at least one outlet <NUM>, and a connection tract <NUM>, the latter hydraulically connecting said at least one inlet <NUM> to said at least one outlet <NUM>.

Said connection tract <NUM> comprises a seat <NUM>, e.g. formed in its structure, in which a diaphragm element <NUM> is arranged. In the illustrated embodiment, said diaphragm element <NUM> is such as to realize an indirect valve adapted to selectively allow a flow of fluid between said at least one inlet <NUM> and said at least one outlet <NUM> of valve body <NUM>.

Said tubular element <NUM> according to the present invention is placed on top of said diaphragm element <NUM>. Said tubular element <NUM> is removably connected, in particular screwed, to said valve body <NUM>, thus ensuring hydraulic tightness, in particular in cooperation with said diaphragm element <NUM>.

In the illustrated embodiment, said tubular element <NUM> comprises a housing <NUM> and a connection portion <NUM>. Said housing <NUM> has a body <NUM> which is distinct from and independent of body <NUM> of connection portion <NUM>.

Said connection portion <NUM> is removably fixed to valve body <NUM> when assembling tubular element <NUM> to said valve body <NUM>.

In the illustrated embodiment, body <NUM> of the housing <NUM> comprises: a cylindrical portion <NUM> having a closed distal end and an open proximal end; and a sealing portion <NUM>, which acts upon diaphragm element <NUM>.

Said housing <NUM> internally houses a core <NUM>, which is adapted to slide within said cylindrical portion <NUM>. Said core <NUM> cooperates with said diaphragm element <NUM> to selectively allow a flow of fluid between inlet <NUM> and outlet <NUM> of valve body <NUM>.

In the illustrated embodiment, a coil <NUM> is arranged around said tubular element <NUM>, in particular around said cylindrical portion of housing <NUM>, which coil <NUM> can generate a magnetic field capable of selectively moving said core <NUM>.

In another possible embodiment, said electromagnetic valve <NUM> according to the present invention is a direct valve.

The features and the principle of operation of a direct valve and an indirect valve will not be described any further herein, since they are per se known to a person skilled in the art.

Even more generally, said electromagnetic valve <NUM> may be either a normally open valve or a normally closed valve, whose features and principles of operation are per se known to those skilled in the art.

One possible, though merely illustrative and non-limiting method of assembling an electromagnetic valve <NUM> according to the present invention comprises the following sequence of (successive) steps:.

This implementation of the method avoids, when assembling tubular element <NUM> to valve body <NUM> on said diaphragm element <NUM>, the exertion of any forces, e.g. twisting forces, that might impair the sealing function. This aspect is particularly advantageous for indirect electromagnetic valves <NUM>.

Advantageously, the step of positioning core <NUM> may comprise a sub-step of positioning an elastic element, e.g. a spring. In such an implementation of the method of assembly, the assembly to be positioned into seat <NUM> of valve body <NUM> comprises also said spring, preferably a coil spring.

During the step of tightening said connection portion <NUM>, said housing <NUM> may be advantageously held firm to prevent any rotational motion from being also transmitted to said housing <NUM>.

According to the present invention, housing <NUM> performs the function of holding said diaphragm element <NUM> in position, while said connection portion <NUM> performs the function of securing tubular element <NUM> to valve body <NUM>, without such two functions being mutually impaired when assembling said tubular element <NUM>.

More generally, tubular element <NUM> according to the present invention can be easily used, e.g. as a spare part, and assembled to existing electrovalves <NUM> as an alternative to prior-art tubular elements <NUM>.

The present invention also ensures, particularly for indirect electromagnetic valves <NUM>, proper operation also at low pressures, thus improving the reliability of electromagnetic valve <NUM> because it prevents diaphragm element <NUM> from being subjected to stress conditions that might jeopardize the operability of such diaphragm element <NUM>, particularly at low pressures. In particular, the present invention ensures tightness of electromagnetic valve <NUM> even when the pressure of the intake water is as low as <NUM> bar.

Claim 1:
Tubular element (<NUM>) for electromagnetic valves (<NUM>), adapted to be assembled to a valve body (<NUM>) comprised in an electromagnetic valve (<NUM>), comprising:
- a housing (<NUM>), adapted to internally receive a core (<NUM>) and allow it to slide therein for switching said electromagnetic valve (<NUM>);
- a connection portion (<NUM>) adapted to be removably fixed to said valve body (<NUM>) for assembling the tubular element (<NUM>) to said valve body (<NUM>);
wherein:
- said housing (<NUM>) has a body (<NUM>) which is separate from and independent of said connection portion (<NUM>), which in turn has a body (<NUM>) of its own;
said body (<NUM>) of the housing (<NUM>) comprising:
- a cylindrical portion (<NUM>) having a closed distal end and an open proximal end;
- a sealing portion (<NUM>) adapted to act upon a diaphragm element (<NUM>) comprised in the electromagnetic valve (<NUM>); said sealing portion (<NUM>) being located at the open proximal end of the cylindrical portion (<NUM>);
said body (<NUM>) of the connection portion (<NUM>) has an annular structure
said body (<NUM>) of said housing (<NUM>) and said body (<NUM>) of the connection portion (<NUM>), being adapted to be connected to each other, in a removable manner;
said tubular element (<NUM>) being characterized in that:
- said sealing portion (<NUM>) comprises connection means (<NUM>) adapted to removably connect said body (<NUM>) of the housing (<NUM>) to the body (<NUM>) of the connection portion (<NUM>);
- on the inner edge of said annular structure of said body (<NUM>) connection elements (<NUM>) are comprised, which are adapted to cooperate with said connection means (<NUM>) of the housing (<NUM>), interacting with each other, to obtain the removable connection and becoming an assembly.