FR2717200A1 - Safety device intended to be interposed between the driving of a drinking water distribution network and the supply line of a water-using device, such as a boiler. - Google Patents

Abstract

The invention relates to a safety device intended to be inserted between the pipe of a drinking water distribution network and the supply pipe of a water user device comprising a backflow preventer (4) which comprises itself a body (5) of generally cylindrical casing, which body: - has sleeves (9, 10) called upstream and downstream - also has a device (7) for connecting with a pipe (8) called discharge and, - houses means (6) for controlling the direction of flow of the fluid, to which backflow preventer is added at least one stopcock (12). This device is characterized in that instead of the shut-off valve being independent of the backflow preventer, at least one of the backflow preventer sleeves (9, 10) directly locally forms the body of a valve so that the latter is integrated into the body of the backflow preventer.

Description

The invention relates to a safety device intended to be interposed

  between driving a drinking water distribution network and the supply line of a water user device, such as a boiler. such a boiler and the radiator network connected thereto form a normally closed circuit in which the heating water may contain products likely to be

dangerous for humans.

  To compensate for losses, for example as a result of purges and / or evaporation, this closed circuit must

periodically be recharged.

  For this purpose, it must temporarily be connected to the drinking water distribution network by a so-called circuit

Power.

  In the event of an incident and, for example, a pressure drop in the drinking water system while the supply system is connected to it, there is a risk of a rise in

heating water to the network.

  Also, in particular, to prevent accidental pollution of the drinking water distribution network, in some countries, it is mandatory to protect the drinking water distribution network against such lifts using a safety device, placed upstream of the user device, referred to as

backflow.

  There is known, for example, a backflow preventer (FR-A-2.620.785) comprising a generally cylindrical casing body, which body: has two said sleeves, with reference to the normal direction of circulation of drinking water, sleeve upstream "and" downstream "sleeve, these two sleeves for connecting hydraulically respectively to a pipe connection to the drinking water distribution network, called" upstream pipe "and a supply line of the user device called" downstream pipe ", furthermore presents a device for putting into relation with a so-called discharge pipe and

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  - Houses means to prohibit the upstream upstream and to evacuate towards the discharge line fluid that would try to circulate against the current that is to say downstream

upstream.

  To be connected to the pipes, the upstream and downstream sleeves each carry at their free end a fraction of a connecting means with that of the corresponding upstream or downstream pipes. Provided that the disconnector can be fixed in a removable manner, these connecting means can be of any known type, such as screw-nut systems in which

  provided sealing rings.

  In most countries, the most recent safety standards also oblige installers of appliances, for example boilers, to add to these backflow preventers at least one isolation tap and, preferably, two taps.

  isolated, one upstream and the other downstream of the backflow preventer.

  To meet these standards, the installer must first study each power supply circuit.

  the device such as the boiler it wants to install.

  Indeed, each user device or its supply line may already have a particular equipment, such as: - a pre-installed backflow preventer, and / or

- one or two isolation valves.

  Then, if necessary, he must carry out the complement in

  using existing faucets on the market.

  For each type of installation or appliance, each installer uses, for reasons of supply,

to a particular type of faucet.

  For these faucets, there is no standard.

  The installer may therefore not have at his immediate disposal a faucet corresponding exactly to that or those required and, consequently, it is not uncommon that the installation is not carried out in a manner compliant with the applicable standards.

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  When the installer does not have or no longer has the appropriate shutoff valve for the installation for which it is intended, whether for: - a new installation or - a maintenance intervention and / or - a repair on the supply circuit requiring replacement: To the backflow preventer and / or one or both isolation valves, so that the customer can use the device for the time it replenishes tap and can re-intervene to bring the installation into compliance, it is not uncommon for it to temporarily mount the backflow preventer on the installation. In this time interval, the absence of isolation valve can damage the safety system and then

  compromise its proper functioning.

  For the same reasons, the installer may also be required to use another type of faucet, which usually requires him to modify the surrounding ducts to take account of the congestion of the new faucet, thus generating an unnecessary installation time and / or

  risk of maladjustment or incorrect reassembly.

  In addition, faucets upstream and downstream of the disconnector multiply the connections and therefore the risks

  leakage and increase the exposure time.

  One of the results that the invention aims to obtain is a safety device of the type mentioned above which is easier to implement either in new or existing installations and which reduces the potential for leaks.

inherent to the connections.

  For this purpose, the invention relates to such a backflow device in particular characterized in that instead of the shutoff valve being independent of the backflow preventer, at least one of the sleeves of the backflow device directly locally realizes the body of a tap. so that this one is

  integrated into the body of the disconnector.

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  The invention will be well understood from the description

  Hereinafter given by way of non-limiting example with reference to the attached drawing which schematically shows an axial sectional view of a safety device comprising a backflow preventer with a stop valve upstream and a tap

stop downstream.

  Referring to the drawing, it can be seen that, in order to protect a drinking water distribution network that supplies a water-using appliance, such as a boiler, a safety device 1 interposed between two pipes 2, 3, of which: a pipe 2 connecting to the drinking water distribution network called "upstream pipe", and - a pipe 3 for supplying the device called "downstream pipe",

  and this, with reference to the normal direction of water circulation.

  This safety device 1 comprises a backflow preventer 4 which itself comprises a generally cylindrical shell body 5, which body: has sleeves 9, 10 said upstream and downstream connecting the disconnector at least indirectly respectively to the upstream and downstream pipes by the intermediate of all known connecting means 11 acting at the free ends of the sleeves, - further has a device 7 for connection to a pipe 8 called discharge to the waste water and - lodge means 6 control the direction of circulation fluid to prohibit the rise to the upstream pipe and evacuate, to the discharge pipe, the fluid that would attempt to flow against the current, that is to say from the downstream to

the upstream.

  In this disconnector, is added at least one stop valve 12 and, preferably, two stopcocks, each for

  isolate the backflow preventer from one of the upstream and downstream pipes.

  According to the invention, instead of the shut-off valve being independent of the backflow preventer, at least one of the sleeves 9, 10 of the backflower directly locally makes the body of a valve so that it is integrated into the body of the backflow.

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  No longer independent of the backflow preventer, the choice of stopcock is no longer left to the initiative and the

rigor of the installer.

  For this purpose, according to the invention, in the sleeve is defined a chamber 13 housing a shutter 14 cooperating with a seat 15 to control the flow of fluid between: - the part of the body of the disconnector housing the control means of the direction of circulation fluid and,

- the free end of the sleeve.

  By integrating at least one of the stopcocks into the body of the backflow preventer, the installer: - benefits from a simplification of the compliance operation, a saving of space and installation time, and - is assured of compliance and complete waterproofness

  of the security system thus realized.

  Depending on the original configuration of the devices on which disconnectors or their destinations are to be installed, it is planned to integrate a valve upstream and / or

downstream.

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Claims (3)

  1. Safety device intended to be inserted between the pipe of a drinking water distribution network and the supply pipe of a water user device comprising a backflow preventer (4) which itself comprises a body (5) of generally cylindrical casing, which body: has sleeves (9, 10) said upstream and downstream connecting the disconnector at least indirectly respectively to the upstream and downstream pipes via any means (11) connection known acting at the free ends of the sleeves, - furthermore has a device (7) for putting into contact with a pipe (8) called discharge to the wastewater and, - means (6) for controlling the direction of circulation of the fluid. to prohibit the rise towards the upstream pipe and to evacuate, towards the discharge pipe, the fluid which would try to circulate against the current, that is to say from the downstream to the upstream, to which backflow is added at least one tap ( 12) and, preferably, two shut-off valves, each for isolating the backflow preventer from one of the upstream and downstream pipes, this device being CHARACTERIZED in that instead of the stopcock being independent of the backflow preventer, at least one of the sleeves (9, 10) of the disconnector directly locally makes the body of a faucet so that it is   integrated into the body of the disconnector.   2. Device according to claim 1 characterized in that, in the sleeve, is defined a chamber (13) housing a shutter (14) cooperating with a seat (15) to control the flow of fluid between: - the body part of the disconnector housing the means for controlling the direction of fluid flow and, - the free end of the sleeve.   3. Device according to claim 1 or 2 characterized in that the downstream sleeve and the upstream sleeve are each provided of a faucet.