FR2606116A1 - Improved non-return valve device for fluids - Google Patents

Abstract

This non-return valve has a retention spring 2 placed outside the body 1 of the valve. This spring is held on the body of the valve by screwing its rear turns into a threading 5 cut into the outer surface of the body of the valve; it embraces the stopper disc 3 and retains the latter by means of a closure turn 6 of smaller diameter. This spring has a large diameter and it can therefore be manufactured from less expensive materials than if it had to be mounted inside the body of the valve. Furthermore, it correctly guides the stopper element in its opening and closing movements.

Description

The present invention relates to what is called

  shovel directional valves or check valves

  tower which, when inserted in the duct to be closed, with the cavity of the body of the valve in line with the axis of the duct, exercise the function of letting the fluid pass through them in the direction of circulation , when the fluid pressure upstream of the valve (according to the theoretical direction of circulation of this

  fluid) becomes greater than a certain predefined value

  when the pressure drops below

  below this certain value, the valve blocks the passage

  fluid age and prevents it from flowing back.

  These valves are in particular of the type which is frequent

  only mounted in compressed air circuits, compress-

  air sisters and the like, and they are usually

  of a relatively small dimension.

  The invention relates to a perfected device

  which can advantageously be applied to the

  titution of valves of the aforementioned type.

  In the field of the invention, there are known

  valves whose operation is based on the action

  ment of a device comprising a ball and an opposing spring and which is housed in the body of the valve, the

  body of the valve having for this purpose a flow duct

  relatively thin sage forming an enlarged iron chamber

  mée at its end by a plug pierced with an orifice coaxial with the conduit. The chamber encloses the counter ball and spring device so that the

  ball is permanently pressed to its closed position

  measure, on the orifice of the valve duct, under the ac-

  tion of the compression spring, the ends of which are supported respectively on the ball and on the plug

from the room.

  In another known arrangement, the orifice of the closure wall of the chamber is crossed by a rod which can move axially and which has a shutter head external to the chamber, while a compression spring associated with said rod is place to

  inside the room, and tends to make the head wear

  shutter on its seat for closing. Each of these known constructions involves:

  - a relatively complicated execution of the

  fluid passage through the valve, due to

  sound of the configuration of the intermediate chamber in which the shutter means work; - A limitation of the dimension of the sealing means, because these means are arranged to

  the inside of the valve body, the external dimensions

  are standardized according to the installation, which limits the flow that can pass through the body of the

  valve to the one that lets the end pass through the-

  what is the filling, these peculiarities

  also managing more precise and more co2-

  teuse and complicating the assembly; this is all the more the smaller the valve; - as a consequence of the previous point, in the smallest valves, either the springs must either

  be made of high quality material to stay

  able to properly exercise their function in a proper

  quate for extended periods with a diameter

  as small, or they lose their ca-

  elastic characteristics, which is a frequent cause of valve malfunctions; - the closing range is imperfect: in

  the case of the ball, due to the deterioration of this-

  the ball as well as the port of the duct; in the case of the shutter head, the bearing surface is large and always makes it difficult to obtain a

  good range and if, to avoid this difficulty, one in-

  apply an O-ring, which is ultimately done,

  this represents the incorporation of an addition element

  nel, which complicates the whole and constitutes a cause of

  breakdowns and organ replacement.

  The subject of the present invention is a device

  improved tif applicable to valves for fluids

  such as those of the aforementioned type and it presents the parti-

  circularity consisting in that, considered in the direction of circulation of the fluid in the valve, the front end

  of the valve body forms a point of reduced size

  te, externally provided with a thread in which

  wind engage the rear turns of a retaining spring

  naked constituted by a tension spring which, thanks to the fact that it overflows beyond the front orifice of the body

  of the valve and that it has at its free end a spi-

  re closing of smaller diameter, is capable of em-

  stir and hold by its front turns, a hard ob-

  turateur which comes to carry for the closure on the orifi-

  this front of the valve body, so we get

  if a shutter or non-return valve which

  a fast closing response at the same time. that it ensures the correct coaxial maintenance of the position

  static and functional operation of the obturating disc

  erator, thereby allowing the passage of fluid when

  the pressure of this fluid inside the body of the

  pet is sufficient to lift said obturator disc from its seat while, at lower pressures of the fluid, the passage of this fluid through the valve is

blocked in both directions.

  Another characteristic of the invention consists

  te in that the frontal plane of the front tip of the body

  of the valve carries a thick semi-toric protuberance

  radially lower than that of said point, in order to guarantee a closing range at the

both correct and durable.

  The main advantages of this device according to the invention can be summarized as follows: - simplicity and economy, since it eliminates

  the need to give any specific configuration

  ciale inside the valve duct, which represents

  sensed much of the complexity of the cons-

  truction and cost of known valves; on the contrary,

  it suffices to thread outside of the former

  front end of the valve body and mounting the tension spring with the shutter disc, these components being simple and inexpensive elements; - arrangement of elements outside the valve body, which allows, even with valves

  small dimensions, to give the spring a suf-

  fisant so that its behavior is optimal without one

  does not have to resort to special materials; by ail-

  their, this arrangement facilitates the manufacture and the

  tage and lets through a greater flow with equal external dimensions of the valve body; - operational safety, which is due to the largest dimension that it is possible to give to the spring, and which allows the latter to work. within extended limits; proper guidance of the movements of the

  disc which is ensured by the fact that the disc is em-

  stirred by part of the spring; to the perfect closure-

  re that the shutter disc establishes on the semi-toric protuberance of the closing seat; and the fact that the spring compensates for damage to the disc

within wide limits.

  Other features and advantages of the

  vention will be better understood on reading the description

  tion which will follow from an exemplary embodiment and with reference to the accompanying drawings in which, Figure 1 is a longitudinal sectional view of a valve device produced according to the invention and

  which represents the situation of the valve closed, with indication-

  tion of the theoretical direction of circulation of the fluid 10; Figure 2 is a longitudinal sectional view similar to the previous one and which shows the situation of the open valve inserted in a pipe; Figure 3 is a view which shows more

  large-scale detail surrounded in Figure 1, which il-

  shines the arrangement of the retaining spring 2 compared to

  port at the threaded point 5 of the body 1 of the valve.

  In the drawings, a pre-

  fairy for carrying out the invention in which the

  pet for fluids has a valve body 1 having a central projection 9 and front and rear parts

  externally fitted with fitting threads 8

  layers by means of which it is possible to connect the corresponding sections of the fluid line so that the valve is interposed in this line

  by establishing its continuity through its

  interior or its valve duct 4, like this

is shown in Figure 2.

  Taking as a reference the theoretical direction of circulation 10 or of advance of the fluid, the valve body

  1 present, in front of the corresponding mounting thread

  in 8, an externally threaded point 5, of a diameter

  be notably smaller than that of the mounting thread 8, and provided, on its front face, with a semi-toric protuberance 7 of thickness much less than that of the

wall of said point 5.

  As clearly shown in Figure 3, on

  this thread 5, the rear turns of a resistor are mounted

  retaining spell 2 consisting of a tension spring whose length is such that its other end is largely beyond the front plane of the tip of the

  body 1 of the valve, the free end of this return spring

  held 2 forming a closing turn 6 of smaller diameter than the rest. Between the closing turn 6 and

  the semi-toric protuberance 7, is placed a obturating disc

  rator 3 which, being embraced laterally by the front turns of the retaining spring 2, is pressed axially by this spring against its seat formed on the protuberance 7, so as to ensure perfect sealing of the conduit

valve 4.

  As is apparent from this description, the

  constitution of the device according to the invention has the qualitative advantages which have been indicated above with regard to its simplicity and its economy, of a

  share, thanks to the simplicity of the elements that are affected

  tees to the shutter function, on the other hand, thanks to the fact that the device does not require special, expensive and complicated execution of the valve duct, which can indeed be entirely smooth, as it is sees in the figures, and ultimately thanks to the large

  dimensions of spring 2 and disc 3, since these di-

  dimensions are not limited by the inside diameter

body 1 of the valve.

  Figures 1 and 2 also show the

  simple operation of the device,

  which consists in the fact that when there is a certainty

  no fluid pressure in the pipe 4 of the valve, the

  obturator disc 3 lifts from its seat on the protu

  canter 7, overcoming the force of the retaining spring

  2 and allowing the fluid to pass in the theo-

  flow risk 10, as indicated by the current lines in Figure 2. When the pressure

  fluid disappears or falls below the threshold

  tction fixed by the elastic characteristics of the

  retaining spring, this spring contracts until oar-

  ner the obturator disc 3 against its seat on the protu

  bérance 7, so that the circulation of the fluid is in-

  broken and that its return in the opposite direction to the theoretical sense is blocked. The relatively large dimension

  of the retaining spring 2 and the surrounding that it forms

  turn of the shutter disc 3 have the effect that the

  Closure can occur almost instantly by preventing backflow or return of fluid through the

  valve; moreover, the fact that the movements function-

  shutter disc nels 3 during closing and opening

  are suitably guided guarantees correct operation

  rect. As can be seen, this mechanism is very safe in operation and, moreover, very durable since the degree of tolerance for the actuation of the spring 2 makes it possible to compensate

  within wide limits the deterioration that occurs

feels on the shutter disc 3.

  Of course, various modifications may be made by those skilled in the art to the device which

  has just been described only by way of non-binding example

  mitative without departing from the scope of the invention.

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Claims (2)

CLAIMS R E V E N D I C A T I O N S   1 - Advanced device of non-return valve   tower for fluids, the hollow body of which is inserted in series service in the duct to be closed, characterized   in that, considered in the theoretical sense of the circu-   lation of the fluid, the front end of the body (1) of the   pet forms a point of reduced size, provided with external   laughingly of a thread in which the rear turns of a retaining spring (2) can be engaged   by a tension spring which, thanks to the fact that it   borders beyond the front opening of the valve body (1)   and that it has an iron whorl at its free end   size (6) of smaller diameter, is capable of embracing   tighten and hold by its turns before a closed disc   tor (3) which comes to wear for closure on the orifice   this front of the body (1) of the valve, so that one obtains   thus a non-return valve which ensures a response.   of closing while maintaining   correctly coaxial with the static position and the ma-   functional work of the shutter disc (3), self-   risking the passage of the fluid when the pressure of   this fluid inside the body (1) of the valve is sufficient   health to lift said obturator disc (3) from its seat while, at lower pressures of the fluid, the passage of this fluid through the valve is blocked in both ways.   2 - Improved valve device for fluid   des according to claim 1, characterized in that the   frontal plane of the front point (5) of the body (1) of the   pet carries a semi-toric protuberance (7) of radial thickness significantly less than that of said tip (5), in order to guarantee a closing range at the same time correct and durable.