Fluid control spool

A fluid control device, comprising a fluid transfer chamber, a first fluid conduit, a second fluid conduit and a third fluid conduit that are fluidly connected to said fluid transfer chamber, a control spool that is arranged movably inside said fluid transfer chamber in a way that said first fluid conduit and said third fluid conduit can be selectively fluidly connected to said second fluid conduit through said fluid transfer chamber, wherein a first control surface of said control spool is arranged in a vicinity of said first fluid conduit such that said first control surface is closer to said first fluid conduit as opposed to another fluid conduit of the second fluid conduit, and the third fluid conduit, wherein a second control surface of said control spool is arranged in a vicinity of said third fluid conduit such that said second control surface is closer to said third fluid conduit as opposed to another fluid conduit of the first fluid conduit, and the second fluid conduit, wherein a fluid flow boosting device, in a form of a fluid flux reducing means and/or a dynamic pressure generating means, is arranged downstream of said first control surface towards said second fluid conduit and inside said fluid transfer chamber, wherein the fluid flow boosting device is configured to increase pressure in an intermediary volume between the fluid flow boosting device and said first control surface during operation of the fluid control device, wherein said first control surface fluidly connects and disconnects said first fluid conduit to and from said fluid transfer chamber and said second control surface fluidly connects and disconnects said third fluid conduit to and from said fluid transfer chamber, and wherein said second fluid conduit is always fluidly connected to said fluid transfer chamber.

A fluid control device comprising:

• a fluid transfer chamber;
• a first fluid conduit, a second fluid conduit, and a third fluid conduit that are fluidly connected to the fluid transfer chamber;
• a control spool that is arranged movably inside the fluid transfer chamber in a way that the first fluid conduit and the third fluid conduit can be selectively fluidly connected to the second fluid conduit through the fluid transfer chamber;
• wherein a first control surface of the control spool is arranged in a vicinity of the first fluid conduit such that the first control surface is closer to the first fluid conduit as opposed to the second fluid conduit and the third fluid conduit;
• wherein a second control surface of the control spool is arranged in a vicinity of the third fluid conduit such that the second control surface is closer to the third fluid conduit as opposed to the first fluid conduit and the second fluid conduit;
• wherein the control spool comprises an intermediary position where no fluid flow is established between the first, second and third fluid conduit through the fluid transfer chamber;
• wherein a fluid flux reducing means is arranged downstream of the first control surface and inside the fluid transfer chamber;
• wherein the fluid flux reducing means is configured to increase pressure in an intermediary volume between the fluid flux reducing means and the first control surface or the second control surface during operation of the fluid control device;
• wherein the first control surface fluidly connects and disconnects the first fluid conduit to and from the fluid transfer chamber;
• wherein the second control surface fluidly connects and disconnects the third fluid conduit to and from the fluid transfer chamber;
• and
• wherein said second fluid conduit is always fluidly connected to said fluid transfer chamber.