ES2291125A1 - Retention valve - Google Patents

Abstract

This valve is of the type that comprises a tubular body (1), inside which an obturator (8) stressed elastically towards its closure position can be displaced axially. Said obturator has a rear pin (7) whereby it is guided via a tubular bush (6) slipped over said pin and coupled removably, via radial arms (5), in the mouth (3) of the body (1) via which the fluid exits. The bush (6) has, towards the mouth (2) of the body (1) via which the fluid enters, an extension (6') that ensures perfect guiding of the obturator (8) in addition to delimiting the travel thereof towards its open position, and the arms (5) are joined, via the end opposite that which joins to the bush (6), to a ring (4) that is threaded on the outside for coupling into the mouth (3), the pin (7) of the obturator (8) having, for its part, at least one longitudinal recess (7') in its cylindrical surface for evacuation of impurities from the valve.

Description

Retention valve.

Object of the invention

The present invention relates, as Indicates its statement to a check valve.

Field of the Invention

This valve is of the type that comprises a body  tubular inside whose axially movable one is mounted shutter elastically requested to its closed position and that, when installed in the corresponding fluid line, it retains this one until a certain pressure in which it opens and lets it pass for her.

Background of the invention

Various models of valves are already known  retention of the indicated type, presenting ones, on both sides opposite of the shutter, two axes by which said shutter is guided by corresponding guides provided in the two mouths of the valve body, and presenting others a single axis in one of the faces of the shutter with which it is guided by a single guide provided in the mouth of the valve body where the fluid comes out.

In the first they occur normally turbulence and noise caused by the impact of the fluid on the surface of the guide located at the mouth of the tubular body by the that enters the fluid and, in the second, although they dispense with the axis and of the corresponding guide corresponding thereto to said mouth eliminating with it the mentioned noises and turbulences, the guided of the indicated shutter with a single axis and a single guide results deficient.

Summary of the invention

These inconveniences or problems, and others that can be derived from them, they are solved with the valve retention object of the present invention, in which the shutter subsequently presents, as the second background cited, a single shaft that is also passed through a single tubular bushing of guide that is removably coupled, through some arms radial, in the mouth of the tubular body through which the fluid comes out, but presenting this cap, towards the mouth of said body by the one that enters the fluid, an extension of the same that, not only compensates the suppression of the other axis but, when starting now the indicated arms of the intermediate zone of the set bushing / extension, the stability of said assembly is ensured and, consequently, the perfect shutter guidance, also delimiting the extension of the bushing the path of said shutter towards its open position.

When the valve and guide free valve are in the  fluid inlet, the intake surface of the fluid increases and, therefore, if you want to maintain the same fluid flow that in the valves with two axes and two guides, the wingspan of the valve, thus reducing the cost of  same.

The internal barrel-like geometry of the inside the tubular body and the discoid configuration, with a central protrusion on its front face, of the sealing element increase the fluid-dynamic capacity of the valve, allowing greater fluidity to the passage of fluid, and reducing the turbulence that may appear in your inside.

Advantageously, the cap arms tubular, preferably inclined to also favor the passage of the fluid, they are coupled to the mouth where the fluid flows through of a ring to whose inner surface said arms are attached at the opposite end to which they are attached to the indicated bushing, and whose outer surface is threaded for coupling to thread in the indicated mouth, also threaded, of the tubular body, thus facilitating the assembly and disassembly of the set bushing / arms / ring in case of possible repair and / or replacement of some element of the valve.

This assembly and disassembly of the set bushing / arms / ring allows, in turn, to regulate the pressure of opening of the valve adapting it to the user's needs, said set being able to loosen a thread, and up to two at most if necessary, to obtain a opening pressure reduction of approximately 20% for Each thread loosened.

For its part, the shutter shaft can have at least one longitudinal recess in its surface cylindrical, which will facilitate the evacuation of impurities from the fluid through the valve and that can accumulate between the mentioned axis and  the tubular bush through which it runs, blocking said axis and compromising the functionality of the valve.

These and other features will come off best of the detailed description that follows, which, for facilitate your understanding, it is accompanied by a sheet of drawings in which has been represented a practical case of realization that cite only by way of example not limiting the scope of the present invention

Description of the drawings

In the drawings:

Figure 1 shows a perspective view exploited from the valve in question,

Figures 2 and 3 illustrate the same in paths partial sections raised, and in closed and open layout respectively, and

Figures 4 and 5 are sections in plan  of the shutter shaft as it passes through the tubular sleeve and with different recesses in its cylindrical surface.

Description of an embodiment

According to the drawings, the valve illustrated retention consists of a tubular body (1) that can be (as illustrated) of a single car to prevent leaks external but that can also be two pieces coupled between yes to make large valves, since the wingspan of the same hinders their machining if they are single single piece

The tubular body (1) has a mouth front (2) fluid inlet and rear (3) outlet thereof, both internally threaded and being coupled in the second a ring (4) externally threaded to whose surface inside a tubular bushing (6) is connected through radial arms (5) that start from the front of said cap tilting backwards to join the ring (4).

Inside the tubular bushing (6) runs an axis (7) guided by the front end a discoidal head that constitutes the valve plug (8), acting against it a spring (9) which, skewered on the shaft (7) and with the front end inserted in an annular groove bottom (8 ') of said shutter, is supported, by the end later, on the start of the arms (5), leaving the part rear end of said spring around an extension (6 ') that the bushing (6) presents, preventing said extension and the indicated groove (8 ') that the spring (9) contacts the shaft (7) and may hinder and / or prevent its displacement.

Also, the extension (6 ') ensures the perfect guidance of the shaft (7) and, consequently, of the shutter (8), which has an annular seal on its front free face peripheral and flat (10) which, vulcanized to a recess annular peripheral (8 '') of said shutter to prevent its detachment and / or the appearance of foreign particles (normally sand) between said joint and the recess (8 ''), contact a circular seat (11) formed in the mouth (2) of the body (1) effecting the hermetic seal.

The shutter (8) also presents, on its face free, a central frustoconical protuberance that deflects towards the sides the fluid that crashes into it favoring circulation thereof, and the axis (7) can have one or more longitudinally  rebates (7 ') that will configure different sections of it (such as the approximately square with rounded corners of the figure 4, or the circular cut by two parallel planes of Figure 5) and determine spaces (13) between the shaft (7) and the bushing (6) by those who will evacuate impurities from the fluid that could block the displacement of said axis.

The invention, within its essentiality, can be put into practice in other embodiments that differ only in detail from that indicated solely by way of example and which will also achieve the protection that collect. This check valve can therefore be carried out with the most suitable media, components and accessories, being able to component elements be replaced by others technically equivalent, because all of this is included within the claims.

Claims (3)

1. Check valve, comprising a tubular body (1) inside which an obturator (8) elastically requested towards its closing position is axially movable and which has a rear axle (7) by which it is guided by a tubular bushing (6) skewered on said shaft and removably coupled, through radial arms (5), in the mouth (3) of the body (1) through which the fluid flows, characterized in that the tubular bushing (6) has, towards the mouth (2) of the body (1) through which the fluid enters, an extension (6 ') of said bushing that ensures the perfect guidance of the shaft (7) and, with it, the shutter (8), and further defines the path of said shutter to its open position. 2. Check valve according to claim 1, characterized in that the arms (5) of the bushing (6) are coupled to the mouth (3) of the body (1) through a ring (4) to whose inner surface they are attached said arms at the opposite end to which they are attached to the indicated bushing, the ring (4) being threaded externally for threaded engagement in the said mouth (3) also threaded. 3. Check valve according to claim 1, characterized in that the shaft (7) of the sealing element (8) has at least one longitudinal recess (7 ') in its cylindrical surface.