FR2593879A1 - VALVE HEAD ADAPTABLE ON A VALVE ROD AND COMPRISING A SEAL - Google Patents

Abstract

Tap head. A housing 1 is provided with an inlet 5 for gas under pressure in a container, a slide 6 having an outlet orifice 32 being movable by means of a handle 9 to push the valve stem of the assembly. valve stem inside the container while simultaneously opening the two ports 5, 32. A seal 24 made of an elastic material is placed in the housing 1 near the connecting means to seal the interior space 21 of the housing 1 towards the exterior, and cooperates with elements linked to the slide 6. The outer surface 26 of the seal 24 and the complementary surface 27 of the housing are substantially rectilinear. The slide 6 is provided with an outwardly directed flange 33 placed in such a way, relative to the seal 24, that this seal is retracted by the flange 33 when the slide 6 is moved to its position in which the orifices 5, 32 are closed. (CF DRAWING IN BOPI)

Description

VALVE HEAD ADAPTABLE ON A VALVE ROD AND COMPRISING

A SEAL

  The present invention relates to a valve head having sealing means for mounting it on a valve stem assembly attached to the wall of a container, said valve head comprising a housing provided with a

  admission for the admission of a gas under pressure

  In the container, a slider is displaceable in the housing and is provided with an outlet for the outlet of a liquid out of the container, the slider being movable by means of a handle to push the slider. valve stem of said assembly inside the container while simultaneously opening the two orifices, a seal constituted by an elastic material being

  placed in the housing near the means of connection

  sound to seal the interior space of the housing to the outside, this seal cooperating with

elements linked to the slider.

  In a known valve head of the type described above, a groove is provided in the

  outer circumferential surface of the gasket

  chéité. An edge provided on the circumferential surface

  inner casing extends in this way.

  in such a way that the seal can perform only a limited displacement in the

  longitudinal direction of the housing. The external surface

  the slider has a circumferential groove

  which, when moving the slider

  in the direction in which the intake orifices

  and outlet are open, the seal is applied to a portion of the valve head assembly, so that the pressurized gas

  can not escape to the outside.

  A disadvantage of this device lies in the fact that it is not easy to mount the seal in the housing, so that

  that the replacement of this joint, as well as the

  the faucet head, when they have to

  be done, require a lot of time.

  A further disadvantage of this

  known positive is that when moving the cou-

  slider to close the inlet and outlet ports, the gasket remains applied against the valve stem assembly by the pressure of the gas which is always present in the interior space of the housing, so that is not easy to

  remove the faucet head from the faucet rod.

  This is especially true when the coupling means are made in such a way that the valve head is inserted over the stem assembly.

  tap in a transverse direction.

  The object of the present invention is to overcome these disadvantages. For this purpose, it is

  provided that the generating lines of the circumferential surface

  exterior of the gasket and the complementary surface of the casing are substantially free of elements penetrating into each other, the

  slider being provided at its end located near

  of the valve stem assembly, an outwardly directed circumferential flange disposed in such a manner relative to the seal, that the seal is moved back by said flange when the slider is moved to its position in which the orifices are closed, the sealing surface of the seal cooperating with the valve stem assembly having grooves in the vicinity of its outer circumference, these grooves extending over a portion of the sealing surface, such that when the flange of the slider carries the seal back with it, this seal is deformed so that the pressurized gas through which the seal is applied to the stem assembly valve can be evacuated by said grooves. Thus, thanks to the presence of the grooves, the gas pressure which is still exerted on the upper surface of the seal and which applies the lower surface of this seal against the valve stem assembly can be distributed. on this surface, whereby the seal can be moved slightly in the axial direction of the boYtier and can be easily removed from the assembly

of faucet rod.

  The mounting of the seal is also

  made easier because this seal only needs to be

  be mounted on the flange provided in the sliding

  bucket, this collar however being positioned at a distance outside the casing so that the mounting of the seal on

  the collar does not pose any problem.

  Due to the straightness of the generating lines of the outer circumferential surface of the gasket and the associated surface of the boYtier, the gasket can be easily inserted into the housing after being mounted on the flange of the slide. In order to further facilitate the movement of the seal towards the inside of the housing, it is possible for the generating lines of the outer circumferential surface of the seal and the associated surface of the casing to extend in such a way that these surfaces are slightly tapered, so that the portion of the seal that is received first in the housing has a smaller diameter than the remaining portion of the seal. According to another embodiment of the invention, it can be provided that the slider has a frustoconical portion, yes, in the position of the slide in which the orifices are closed, is located between the seal and the orifice of gas inlet, the smaller diameter of said frustoconical portion being located closer to the joint

  sealing, this frustoconical part being able to cooperate

  with an associated part of the seal

  when opening the orifices, throats extend

  substantially in an axiate direction having been provided in the associated part of the seal,

  the gas that can flow through these grooves in the recess

  while the tapered portion of the slider applies the seal against the valve stem assembly.

  In accordance with yet another mode of

  In accordance with the present invention, the surface of the seal facing the interior of the housing has pins which, in the position pressed inwardly of the seal, are compressed by

  such that they have a low height only-

  these pins moving the light seal

  outward immediately after the

slide was released.

  Thanks to this, during the movement of the

  bucket outward to actuate the valve stem, the seal is pressed directly onto the upper surface of the valve stem, given

  that the pimples tend to return to their original form.

  By this arrangement it is avoided that, when the valve stem is pushed towards the inside of the container by the slider, gas can escape from the container.

which must be open.

  Other features and advantages of the invention will become apparent upon reading the

  following description of an example embodiment

  given by way of illustration and in no way limiting, with reference to the appended figures, in which; - Figure I shows a vertical view in longitudinal section of the valve head according to the invention, some parts being shown in different positions; FIG. 2 is an enlarged fragmentary sectional side view of the seal of the valve head shown in FIG. 1; - Figure 3 shows a plan view of the seal of Figure 2; and - Figure 4 shows a view from below

  of the seal of Figure 2.

  The valve head shown in the figures comprises a housing 1 which is provided, at its part

  lower, a flange 2 extending approximately

  The casing 1 can be mounted transversely to the flange 3 of the valve stem assembly 4 by virtue of the portion 2 having an L-shaped section, which together is a half-circumference and has a substantially L-shaped cross-section. valve stem 4 being attached to the wall of a container such as a barrel or barrel (not shown) at

means of a thread.

  The housing I is provided with an inlet orifice, this orifice being connected in a manner that is not shown to a pressurized gas container,

especially a C02 cylinder.

  A slide 6 is displaceable vertically in the casing 1, this slide having seals 7 and 8. The upward and downward movement of the slide 6 in the direction of the arrows 7 is caused by a handle 9 which is pivotally mounted at point 10 on a part making

protrusion 11 of the housing 1.

  Part of the handle 9 extends along the slide 6 and is provided at this point with an axis 12 which comes into contact with a flat portion 13 of the slider 6, so that the pivoting of the handle 9 upwardly from the position shown in FIG. 1 an angle α causes the slider 6, which is initially in the position shown on the left-hand part of FIG. 1, to move towards the position represented on FIG.

right part of figure 1 ..

  In order to block the handle 9 in the

  two extreme positions, a lever 14 has been provided.

  This lever is pivotally connected to the handle 9 at point 15 and comprises a portion 16 which can either come below a stop 17 connected to the casing 1

  either in a notch 18 of the abutment 17.

  A compression spring 19 is mounted between the handle 9 and the lever 14. This spring is held in position by a bent portion 20 of

the flat part of the lever 14.

  As already explained above, the slider 6 will occupy the position shown on the right-hand part of FIG. 1 when the handle 9 is turned towards its upper position. In this position, the seals 7 and 8 seal the inlet orifice S so that the gas can not penetrate through the orifice 5 in the space 21

of the case.

  When turning the handle 9 to its position shown in Figure 1, the slider 6 is moved to its position shown on the left side of Figure 1. When this is done, the seal 8 clears L inlet port 5 of such

  so that gas can now penetrate into

pace 21 of the housing 1.

  At the same time, the conical portion 22 of the neck

  slat 6 comes into contact with a corresponding part of a seal 24, so that the lower surface 25 of this seal is applied.

  against flange 3 of the valve stem assembly 4.

  Since the outer surface 26 of the slightly conical seal 24 comes into contact with the slightly conical circumferential surface 27 of the housing 1, the interior space 21 of the housing 1 is closed outwardly. Given

  that the gas flowing in the casing 1 through the

  the inlet surface 5 exerts a pressure on the upper surface 28 of the seal 24, its lower surface 25 is applied further to the flange 3. In order to obtain a labyrinth seal, grooves 29 may be surfaces 25 and 26, as can be seen in particular on the

figure 2.

  In the position of the slider and the seal 24 shown in the left-hand part of FIG. 1, the gas can flow out of the space 21 through the seal 24 because grooves 30 are provided in this seal

  in a substantially axial direction.

  In the position of the slider shown on the left-hand side of Fig. 1, the gas flows to the container through the grooves 30. Since the valve stem of the valve stem assembly is pushed inwardly of the container,

  liquid may be forced under pressure out of the container

  and arrive at the planned interior canal 31

  slide 6 to exit through the outlet port 32.

  When the handle is moved upwards, after having released it by acting on the lever 14, the seal 8 closes the inlet orifice 5 in the manner described above, and a flange 33 facing the The outer end provided at the lower end of the slider 6 will be applied against the intermediate portion of the lower surface 25 of the seal 24. In order to facilitate the separation of the surface 24 of the seal 24 from the flange 3 of the valve stem assembly 4, a number of grooves 34 are provided in the lower surface, these grooves being located outside the sealing portion of the surface 25. The seal may now be moved easily to the position shown on the right side of Figure 1, after which the housing 1 can be removed by moving it

  transversely of the valve stem assembly 4.

  Since the middle part of the seal of

  when the collar 24 is raised, the gas pressure prevailing in the space 21 can escape through

the grooves 34.

  In addition, the upper surface of the seal 24 has pins 35 which, in the retracted position of the slider 6, will be compressed as the flange 33 pushes the seal inwardly. When the slider 6 is moved outward again, i.e. towards the position shown on the left-hand side of FIG. 1, the pins 35 will cause the seal 24 to be applied directly against the flange 3 of the set

  4. This will occur before the

  slat 6 pushes the valve stem towards the interior of the container, that is to say before gas can flow to the space 21 of the housing 1 out of the container because in this space does not yet prevail

  no pressure due to the fact that the seal

  8 has not yet been moved far enough for the inlet 5 to be sufficiently clear to permit the flow of gas to

pace 21.

Claims (4)

CLAIMS -   A valve head having connection means for attaching same to a valve stem assembly (4) mounted in the wall of a container, said valve head including a housing (1) having a port inlet (5) for the admission of pressurized gas, in particular CO 2, into the vessel, a slider (6) being movable in the housing (1) and having an outlet (32) for the outlet of a liquid out of the container, this slider being movable by means of a handle (9) to push La   valve stem of said assembly within the recess   while simultaneously opening the two orifices (5, 32), a seal (24) consisting of an elastic material being placed in the casing (1) close to the connecting means to seal the interior space ( 21) of the housing (1) towards the outside, this seal (24) cooperating with elements connected to the slide (6), characterized in that the generating lines of the outer circumferential surface (26) of the seal of sealing (24) and   complementary surface (27) of the casing are   without the elements penetrating into each other, the slider (6) being provided at its end located near the valve stem assembly (4),   a circumferential collar directed towards the ex-   interior (33) arranged in such a manner, relative to the seal (24), that said seal is moved back by said flange (33) when the slider (6) is moved to its position in which the orifices (5, 32) are closed, the sealing surface (25) of the seal (24) cooperating with the valve stem assembly (4) having grooves (34) adjacent its outer circumference, these grooves (34) being extending over part of the sealing surface (25), 1 1 so that when the flange (33) of the slider (6) carries the seal (24) back with it, this seal seal (24) is deformed such that the pressurized gas through which the seal (24) is applied to the assembly   valve stem may be evacuated by said nails (34).   2. Faucet head according to claim 1,   characterized in that the generating lines of the sur-   circumferential face (26) of the seal (24) and the associated surface (27) of the housing (1) extend in such a manner that said surfaces are slightly   in such a way that the part of the seal of   which is first received in the shoemaker (1) pre-   a smaller diameter than the remaining part of the seal (24).   3. Faucet head according to claim 1   or claim 2, characterized in that the cou-   sliver (6) has a frustoconical portion (22) which, in the position of the slider (6) in which the orifices (5, 32) are closed, is located between the seal (24) and the orifice of admission of   gas (5), the smallest diameter of said truncated portion   conical (22) being located closer to the seal (24), this frustoconical part (22) being able to cooperate with an associated part (23) of the seal (24) when opening the orifices (5, 32), grooves (30) extending substantially in an axial direction having been provided in the part (23), the gas can flow through these grooves in the container while the part   taper (22) of the slider (6) applies the seal of   (24) against the valve stem assembly (4).   4. Faucet head according to any one of   preceding claims, characterized in that the   surface (28) of the seal (24 facing the inside of the housing (1) has pins (35) which, in the position pressed towards the inside of the seal (24), are compressed in such a way that they have a low height only, these spikes   removing the seal (24) slightly towards -   outside immediately after the slider has been out.