FR2847648A1 - Relief valve for releasing air from water pipes under pressure has chamber with upper and lower cones with seal and spacers respectively for spherical float - Google Patents

Abstract

The air release valve consists of a chamber (1) linked to a high point on the water circuit (4) and having an outlet (20) and a spherical float (6). The chamber has upper (2) and lower (3) cones with a seal ring (5) and spacers (31) respectively for the float, so that water filling the chamber holds the float against the seal ring, while air in the chamber allows the float to drop, letting the air out. The spacers keep the float above the bottom of the chamber so that air can pass it.

Description

The present invention relates to a suction cup device for evacuating

  air from pressurized water pipes,

  allowing in particular to avoid water hammer.

  Numerous suction cup devices are already known, which allow the expulsion of air on a pressurized pipe and the entry of air during the emptying of said pipe. These devices are in particular intended to equip drinking water or wastewater networks. In general, these devices comprise an enclosure which communicates with the pipe and which is arranged at a high point of the circuit, and which comprises, preferably superiorly, an orifice for the passage of air, capable of being or not, depending on the envisaged case, blocked by a

  float disposed inside said enclosure.

  In the case of an overpressure, the float rises and is brought to close the orifice thus eliminating any risk of leakage, in the case of depression the float is moved away from

  the orifice which authorizes the return of air.

  The existing devices have drawbacks, in particular in that the float is associated with complex and fragile guide means, which moreover slow the operation thereof and are therefore detrimental to the function of the device. Furthermore, these devices are sensitive to lime deposits and, in the case of use on a wastewater circuit, to suspended detritus, so that at the

their effectiveness decreases.

  The object of the present invention is to propose a suction cup device for evacuating the air from the water pipes under

  pressure to remedy these various drawbacks.

  The suction cup device for evacuating air from pressurized water pipes according to the invention is of the type comprising an enclosure which communicates with the water circuit at a high point thereof, and which comprises an orifice for the passage of air, capable of being or not, as the case may be, blocked by a float disposed inside said enclosure, and it is essentially characterized in that said enclosure is delimited above by a conical narrowing having an opening on the outside and internally lined with an O-ring, and below by a conical narrowing having an opening on said circuit and lined internally with studs capable of holding said float at a certain distance from said opening, while said float consists of a sphere capable of closing said opening on the outside by coming to lodge against

said O-ring.

  According to an additional characteristic of the device according to the invention, the O-ring is placed in the conical narrowing at a location making it possible to ensure that the sphere is perfectly guided by the conical wall

said narrowing.

  According to another additional characteristic of the device according to the invention, the opening to the outside of the upper conical narrowing opens into a tubular part, while the O-ring is disposed at the inlet.

of said tubular part.

  According to another additional characteristic of the device according to the invention, the O-ring is housed in a

  shoulder in the tubular part.

  According to a particular embodiment of the device according to the invention, it consists of two elements each comprising a tubular part, the tubular parts are of complementary diameters allowing the fitting of one

  in the other to form the enclosure.

  According to another particular embodiment of the device according to the invention, it consists of two elements each comprising a tubular part, the tubular parts are of the same diameter and are intended to be abutted to form the enclosure, while a sleeve tubular is threaded over said abutment tubular parts to ensure the

joining and sealing.

  According to another additional characteristic of the device according to the invention, it is made of a material

  plastic, such as polyvinyl chloride (PVC).

  The advantages and characteristics of the device according to

  the invention will emerge more clearly from the description which

  follows and which relates to the attached drawing, which represents

  a non-limiting embodiment.

  In the accompanying drawing: - Figure 1 shows a schematic sectional view

  longitudinal of a suction cup device according to the invention.

  - Figure 2 shows a schematic view in longitudinal section of the same device during a phase of

different operation.

  - Figure 3 shows a partial schematic view in

  cutting of the same device during construction.

  - Figure 4 shows a partial schematic view in

  section of a variant of the same device.

  With reference to FIGS. 1 and 2, it can be seen that a suction device according to the invention comprises an enclosure 1 of tubular shape, bordered above by a frustoconical part 2 having a central opening 20 opening onto the outside, and bordered below by a frustoconical part 3 having a central opening 30 opening

  on line 4 of a water circuit.

  The opening 20 opens onto a tubular part 21, while

  that an O-ring 5 is disposed and fixed in the latter.

  It should be noted that a shoulder may be provided in the part

  tubular 21 for wedging the O-ring 5.

  The frustoconical part 3 comprises near the opening 30 and projecting from its internal wall of the studs

31 distributed all around.

  The tubular enclosure contains a float 6 of spherical shape intended, during a rise in pressure, to come to be pressed against the O-ring 5 under the rise P of the water after evacuation of the air, and thus to close the opening 20,

  as shown in Figure 1.

  Note the location of the O-ring 5, which is placed in the tubular part 21, so that the wall of the part

  tapered 2 performs its self-centering function of the float 6 to its end.

  When the pressure drops, as shown in FIG. 2, the float descends into the enclosure 1 until it comes to rest on the studs 31 which consist of spacers making it possible to support the float 6 while allowing the passage of the air, materialized by a double A arrow, between the circuit and the outside. This configuration is notably

  used during a purge of the circuit.

  Referring now to FIG. 3, it can be seen that the suction device according to the invention comes from the fitting of two elements 10 and 11, each comprising a sleeve, respectively 12 and 13, these sleeves being of suitable diameters to allow fitting one into the other in order to reconstitute the enclosure 1. The sleeve 12, which is extended by the frustoconical part 2, has an outside diameter equal to the inside diameter of the sleeve 13, which is

  extended by the frustoconical part 3.

  Referring now to FIG. 4, we can see another mode of construction of the device according to the invention, which comprises two elements 14 and 15 each comprising a tubular part, respectively 16 and 17, and a frustoconical part, respectively 2 and 3 , provided with an opening, respectively 20 and 30, these two elements 14 and 15 being assembled by abutment of the tubular parts 16 and 17 to reconstitute the enclosure 1, while a tubular sleeve 18 covers them

  externally to ensure bonding and sealing.

  These two constructions are particularly advantageous for an embodiment in a plastic material, preferably

polyvinyl chloride (PVC).

  The first embodiment is more particularly intended to be used for a drinking water circuit while the second is more particularly intended to be used on

a wastewater circuit.

Claims (7)

  1) Suction device for evacuating air from pressurized water pipes of the type comprising an enclosure (1) which communicates with the water circuit (4) at a high point thereof, and which comprises an orifice (20 ) for the passage of air, capable of being or not, as the case may be, blocked by a float (6) disposed inside said enclosure (1), characterized in that said enclosure (1) is delimited upper by a conical narrowing (2) having an opening on the outside (20) and internally lined with an O-ring (5), and lower by a conical narrowing (3) having an opening (30) on said circuit (4 ) and internally lined with studs (31) capable of holding said float (6) at a certain distance from said opening (30), while said float (6) consists of a sphere capable of closing said opening on the outside (20 ) coming to stay against said O-ring (5).   2) Device according to claim 1, characterized in that the O-ring (5) is arranged in the conical narrowing (2) at a location which ensures that the sphere (6) is perfectly guided by the conical wall of said narrowing (2).   3) Device according to claim 2, characterized in that the opening (20) on the outside of the upper conical narrowing (2) opens into a tubular part (21), while the O-ring (5) is disposed at the entry of said tubular part (21).   4) Device according to claim 3, characterized in that the O-ring (5) is housed in a shoulder provided in the tubular part (21).   5) Device according to any one of claims   above, characterized in that it consists of two elements (10, 11) each comprising a tubular part (12, 13), the tubular parts (12, 13) are of complementary diameters allowing the fitting of one in the other to form the enclosure (1).   6) Device according to any one of claims 1   to 4, characterized in that it consists of two elements (14, 15) each comprising a tubular part (16, 17), the tubular parts (16, 17) are of the same diameter and are intended to be abutted to form the enclosure (1), while a tubular sleeve (18) is threaded over said abutment tubular parts (16) to ensure the joining and sealing.   7) Device according to any one of claims   previous, characterized in that it is produced in a   plastic material, such as polyvinyl chloride (PVC).