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EP-4737770-A1 - CONSTANT DIFFERENTIAL PRESSURE VALVE WITH FLUID FLOW SHIELDING WALL

EP4737770A1EP 4737770 A1EP4737770 A1EP 4737770A1EP-4737770-A1

Abstract

The invention relates to a constant differential pressure valve arrangement (3). The housing (4) of the constant differential pressure valve arrangement (3) comprises a fluid transfer chamber (26) for the shutter member (27) of the constant differential pressure valve arrangement (3). A shielding wall member (39) is arranged between the fluid transfer chamber (26) and the shutter member (27). The shielding wall member (39) is designed and arranged in a way that it at least significantly reduces dynamic fluid flow forces in the gap (37) between the shielding wall member (39) and the shutter member (27).

Inventors

  • Papez, Primoz
  • SLOKAR, Jan
  • BELAKAPOSKI, Jovan
  • OVTAR, Domen
  • THALER, Tilen

Assignees

  • Danfoss A/S

Dates

Publication Date
20260506
Application Date
20251007

Claims (14)

  1. Housing (4) for a variable fluid flow throughput valve arrangement (3), preferably for a constant differential pressure valve arrangement (3), the housing (4) comprising a fluid transfer chamber (26) for the shutter member (27) of the variable fluid flow throughput valve arrangement (3), characterised by a shielding wall member (39) between the fluid transfer chamber (26) and the shutter member (27), wherein the shielding wall member (39) is designed and arranged in a way that it at least significantly reduces dynamic fluid flow forces in the gap (37) between the shielding wall member (39) and the shutter member (27).
  2. Housing (4) according to claim 1, characterised in that the fluid transfer chamber (26) and/or the shutter member (27) are designed and arranged circumferentially.
  3. Housing (4) according to any of the preceding claims, in particular according to claim 2, characterised in that the fluid transfer chamber (26) is designed and arranged as a toroid-shaped chamber (26) and/or in that the shutter member (27) is designed and arranged as an essentially rotationally symmetric member (27), preferably as a cup-shaped member (27).
  4. Housing (4) according to any of the preceding claims, characterised in that the housing (4) around the fluid transfer chamber (26) and the shielding wall member (39) is designed and arranged as a single piece body.
  5. Housing (4) according to any of the preceding claims, in particular according to claim 4, characterised in that it is produced by at least a casting step, possibly by a casting step with a consecutive material removing manufacturing step.
  6. Housing (4) according to any of the preceding claims, in particular according to claim 5, characterised in that the housing (4) comprises a metal or a metal alloy, at least in the vicinity of the circumferentially arranged fluid transfer chamber (26).
  7. Housing (4) according to any of the preceding claims, characterised in that the fluid outlet chamber (26) comprises a fluid conduit (5) that is mainly aligned in a radial direction, possibly comprising a tilting angle towards the axial direction and/or towards the tangential direction, wherein at least one tilting angle is preferably an acute angle.
  8. Housing (4) according to any of the preceding claims, characterised in that the height of the shielding wall member (39) is between 30 and 70%, preferably between 40 and 60%, even more preferably between 45% and 55% of the height of the fluid outlet chamber (26) surrounding the shielding wall member (39).
  9. Variable fluid flow throughput valve arrangement (3), in particular constant differential pressure valve arrangement (3), characterised by a shutter member (27) and a housing (4) according to any of the preceding claims.
  10. Variable fluid flow throughput valve arrangement (3) according to claim 9, characterised in that the shutter member (27) comprises at least two sections (29, 30) with different radii, in particular at least two cylinder barrel like shaped sections (29, 30) with different radii.
  11. Variable fluid flow throughput valve arrangement (3) according to claim 9 or 10, in particular according to claim 10, characterised in that the constant differential pressure valve (3), in particular the height of the shielding wall member (39) and the position of the change of the radius of the shutter member (27) are designed and arranged in a way that the shielding wall (39) covers the larger sized part (29) of the shutter member (27) in any position of the shutter member (27).
  12. Variable fluid flow throughput valve arrangement (3) according to any of claims 9 to 11, characterised in that the shutter member (27) fluidly separates a fluid transfer chamber (26, 42) and a pressure reference chamber (34), wherein preferably a flexible membrane (32) is provided between the shutter member (27) and the housing (4).
  13. Variable fluid flow throughput valve arrangement (3) according to any of claims 9 to 12, characterised in that the shutter member (27) is designed and arranged to move in an axial direction.
  14. Control valve arrangement (1) comprising at least one variable fluid flow throughput valve arrangement (3) and/or at least one additional valve arrangement (2), preferably at least one variable fluid flow throughput valve arrangement (3) and at least one poppet valve arrangement (2), characterised in that the variable fluid flow throughput valve arrangement (3) is designed and arranged as a variable fluid flow throughput valve arrangement (3) according to claim 11 or 12.

Description

The invention relates to a housing for a variable fluid flow throughput valve arrangement, preferably for a constant differential pressure valve arrangement, wherein the housing comprises a fluid transfer chamber for the shutter member of the variable fluid flow throughput valve arrangement. The invention also relates to a variable fluid flow throughput valve arrangement. Further, the invention relates to a control valve arrangement, comprising at least a variable fluid flow throughput valve arrangement and at least an additional valve arrangement. Variable fluid flow throughput valves are well known and widely used in the prior art. They are used when a fluid flow has to be controlled with respect to its flux (volume per time unit). Such a variation in the fluid flux may be required for various reasons, for example to provide a certain, desired flux through the valve, to realise a certain pressure difference over the valve, or the like. Due to the widespread use of such variable fluid flow throughput valves, it is no surprise that a wide variety of different designs have been suggested that all show certain advantages and disadvantages. Depending on the situation, certain basic designs are usually preferred over the other. In particular, when it comes to constant differential pressure valve arrangements usual designs show a circumferentially arranged fluid transfer chamber, where the fluid transfer chamber provides or collects the fluid to be controlled around a usually also circumferentially designed movable shutter member. Further, a pressure reference chamber is provided that is fluidly connected to a different part of the valve by means of a fluid conduit. This way, the position of the shutter member is influenced by the pressure difference between its upper side (fluidly connected to the fluid transfer chamber, fluid inlet conduit, interconnecting fluid conduit) and its lower side. To avoid any fluid losses between the two sides of the shutter member, without introducing any unnecessary frictional forces, typically an additional flexible sealing member seals of the two sides of the shutter member. In principle, such constant differential pressure valves with cylindrical shutter members work admittedly well in practice, and are consequently widely employed. However, such constant differential pressure valves still are deficient when it comes to control quality, i.e. the quality of the variation of the differential pressure that is achieved by the controlling behaviour of the constant differential pressure valve are still somewhat inferior. Another issue is that such designs with a cylindrical shutter member and a flexible membrane are prone to agglomeration of dirt near the membrane, so that they have a comparatively short maintenance interval. It is no surprise that such a behaviour is undesired and that there is a desire in the present technical field to remove such problems, or at least to reduce such problems. It is therefore an object of the present invention to suggest a housing for a variable fluid flow throughput valve arrangement, preferably for a constant differential pressure valve arrangement, wherein the housing comprises a fluid transfer chamber for the shutter member of the variable fluid flow throughput valve arrangement, that is improved over such housings as they are known in the prior art. It is another object of the present invention to suggest a variable fluid flow throughput valve arrangement, in particular a constant differential pressure valve arrangement, that is improved over variable fluid flow throughput valve arrangements as they are known in the prior art. It is yet another object of the present invention to provide a control valve arrangement that is improved over control valve arrangements as they are known in the prior art. A housing for a variable fluid throughput valve arrangement according to claim 1 and/or a variable fluid flow throughput valve arrangement according to claim 9 and/or a control valve arrangement according to claim 14 solve these objects, respectively. It is suggested to design a housing for a variable fluid flow throughput valve arrangement, preferably a housing for a constant differential pressure valve arrangement, the housing comprising a fluid transfer chamber for the shutter member of the variable fluid flow throughput valve arrangement, in a way that a shielding wall member is provided between the fluid transfer chamber and the shutter member, wherein the shielding wall member is designed and arranged in a way that it at least significantly reduces dynamic fluid flow forces in the gap between the shielding wall member and the shutter member. The variable fluid flow throughput valve, and consequently the variable fluid flow throughput valve arrangement, can be designed according to any suitable design that is around in the prior art. In particular, the variable fluid flow throughput valve can be designed and arranged as a movable shutter valve (