FR2580772A1 - Device for isolating an enclosure containing a pressurised fluid - Google Patents

Abstract

Device for isolating an enclosure containing a pressurised fluid. The invention relates to an isolating device whose internal design makes it possible substantially to improve the flow-rate performance. It consists of a body 1 on which the mounting of a pipework-fitting accessory 10 makes slide on a sleeve 4 causing the opening of the valve 8, and the compression of the return spring 2, thus allowing fluid to escape via the openings 12. A deflector cone 11 directs the passage of the fluid. The isolation device, according to the invention, is more particularly intended to be used as an intermediate safety accessory between a tank containing a pressurised fluid and a safety valve or other pipework-fitting accessories requiring frequent dismantling. It may be used as a non-return or filling valve.

Description

 The present invention relates to the design of a device for isolating an enclosure such as a tank of liquid or gas under pressure, allowing the change of a fitting accessory, without having to pour the fluid into another container. .

 This isolation device is more particularly intended to be mounted between a tank and an accessory, which may be a safety valve, to verify the proper functioning during control and maintenance operations.

 Isolation devices of similar use already exist but they create significant pressure losses, which is very detrimental when these affect the flow of safety devices. Thus, in many cases, manufacturers are led to oversize these. devices to ensure the required flow rates.

 The isolation device according to the invention overcomes this drawback. Contrary to what exists on the market, the internal part, through which the fluid passes, presents no obstacle, the guiding and the return of the valve being effected outside of the part channeling the fluid.

 For the same external dimensioning, the passage section is significantly improved and thus makes it possible to obtain flow rates greater than 15 z higher than traditional models.

 The design of the parts constituting the isolation device according to the invention makes it possible, while improving the yield, to reduce the cost price thereof, by simplifying the tools necessary for its production and, in particular, for that of the body.

With the exception of the openings made in the lower part of the sheath and the spring, all the other parts can be made by turning.

 In Figure 1, the right half-view shows the isolation device in the open position and the left half-view in the closed position, that is to say, faucet accessory disassembled.

 The mounting of the isolation device on the enclosure is shown screwed onto a boss of the enclosure to be protected by tapered thread, ensuring sealing. This connection could equally well be made by cylindrical thread with elastomer seal or by a flange connection.

 This isolation device can be made of a rigid material (steel, copper or aluminum alloy, composite materials) provided that it is compatible with the fluid contained in the enclosure.

 The isolation device according to the invention, shown in Figure 1, consists of a body (I) in which there is a return spring (2) resting on a shoulder (3). A sheath (4) also comprising a shoulder (5) thus traps the return spring (2). The guide of the sleeve (4) is carried out in two extreme zones (6) and (7) of sufficient length to allow the valve (8) to return well to its position on its seat, whatever its mounting position.

 In the upper part of the body (1) is a thread (9) into which the fitting accessory (in) will be screwed. By screwing this fitting accessory (in), the valve (8) fixed to the sleeve (4) is opened by detachment from its seat. The fluid can then pass through the largely dimensioned openings (I2). A deflector cone (il), of appropriate shape, is positioned in the lower part of the sleeve (4) above the valve (8) allowing the movement of the horizontal fluid to be transformed into vertical movement or vice versa, depending on the direction of passage of this one. I1 also makes it possible to suppress the turbulances which would occur on the rear of the valve (8) when the fluid leaves the enclosure. The fixing of the deflector cone (II) and of the valve (8) on the sleeve (4) can be produced by a screw (I3), as shown in Figure 1 or by riveting.

 The isolation device according to the invention is more particularly intended to be used as an intermediate safety accessory between a tank containing a liquefied gas, compressed or dissolved under pressure and a safety valve protecting it against possible overpressures caused by accidental intake of calories (fire), without disturbing its evacuation rate. More than a million of this type of accessories are currently in service and, due to the evolution of safety regulations, are no longer suitable, as far as the speeds they provide. The isolation device according to the invention makes it possible to overcome this drawback at a lower cost.

 This isolation device can also be used as a non-return or filling valve.

Claims (6)

CLAIMS IO) Device for isolating an enclosure containing a pressurized fluid, characterized in that it comprises a sheath (4) inside of which there is no organ blocking the flow of the fluid when it is allowed to cross it. 20) Device according to claim 1, characterized in that the return spring (2) is housed in a gap located between the inner wall of the body (1) and the outer wall of the sleeve (4). 30) Device according to any one of the preceding claims, characterized in that it comprises, on the bottom of the sheath (4) a deflecting cone (II) directing the flow of the fluid. 40) Device according to any one of the preceding claims, characterized in that it can be produced in any rigid machinable material, provided that this is compatible with the fluid contained in the enclosure. 50) Device according to any one of the preceding claims, characterized in that it can be used as a non-return or filling valve. 60) Device according to any one of the preceding claims, characterized in that the guide of the sheath (4) is carried out on two zones (6) and (7), preventing it from deviating from its course. 70) Device according to claim 6, characterized in that it can be mounted in any position.