Three-way flap valve with curved valve flap

1. A three-way flap valve comprising:

an inlet;

a first outlet;

a second outlet; and

a valve flap moveable between at least a first position and a second position, with fluid flowing in through the inlet being directed to the first outlet with the valve flap in the first position, and fluid flowing in through the inlet being directed to the second outlet with the valve flap in the second position, wherein a surface of the valve flap, circumscribed by an outer edge, comprises at least one first surface section with a curvature;

wherein the valve flap comprises a second surface section and a third surface section;

wherein the first surface section is located between the second surface section and the third surface section;

wherein the valve flap comprises a curvature in the second and third surface section that differs from the curvature in the first surface section; and

wherein the valve flap is shaped as a spherical segment in the first surface section, and shaped as a truncated cone segment in the second and third surface sections;

wherein a valve body forms the inlet and the first outlet and the second outlet;

wherein the valve flap is located inside the valve body;

wherein a pivot pin passes straight through the valve body and rotatably connects the valve flap to the valve body;

wherein a curved baffle plate is supported by the pivot pin.

2. A three-way flap valve according to claim 1 , wherein:

an inner surface of the valve flap circumscribed by the outer edge and facing towards the inlet is concave in at least the first surface section.

3. A three-way flap valve according to claim 2 , wherein:

the valve flap comprises an outer surface circumscribed by the outer edge and facing away from the inlet; and

the outer surface is spaced apart from the inner surface and is convex in at least the first surface section.

4. A three-way valve according to claim 1 , wherein the curvature of the valve flap has, at least in the first surface section, a radius of curvature smaller than 1.00 m.

5. A three-way flap valve according to claim 1 , wherein:

the valve flap is adapted for rotation around a pivot axis; and

the first surface section extends around a first angle of between 50° and 130° with respect to the pivot axis;

the second and third surface sections each extend around a second angle equal to half of the difference between 180° and the first angle.

6. A three-way flap valve according to claim 1 , wherein:

the curved baffle plate comprises a concave surface facing towards the inlet.

7. A three-way flap valve according to claim 1 , wherein the valve flap comprises at least one protrusion on an outer surface circumscribed by the outer edge and facing away from the inlet.

8. A three-way flap valve according to claim 1 , wherein the valve body comprises, on a valve body inside wall opposite the inlet, a protrusion oriented towards the inlet and extending along a pivot axis enabling a pivoting movement of the valve flap.

9. A three-way valve comprising:

a valve body with a first fluid passage, a second fluid passage and a third fluid passage; and

a valve flap moveable between at least a first position connecting the first fluid passage and the second fluid passage and a second position connecting the first fluid passage and the third fluid passage, wherein a surface of the valve flap, circumscribed by an outer edge, comprises at least one curved surface section;

wherein the valve flap comprises a first surface section, a second surface section and a third surface section;

wherein the first surface section is located between the second surface section and the third surface section;

wherein the valve flap comprises a curvature in the second and third surface section that differs from the curvature in the first surface section;

wherein the valve flap is shaped as a spherical segment in the first surface section, and shaped as a truncated cone segment in the second and third surface sections;

wherein the valve flap is located inside the valve body;

wherein a pivot pin passes straight through the valve body and rotatably connects the valve flap to the valve body;

wherein a curved baffle plate is supported by the pivot pin.

10. A three-way valve according to claim 9 , wherein:

the first fluid passage is an inlet;

the second fluid passage is a first outlet;

the third fluid passage is a second outlet; and

the curved surface section extends away from inlet and toward the second outlet with the valve flap in the first position and the curved surface section extends away from inlet and toward the first outlet with the valve flap in the second position.

11. A three-way valve according to claim 10 , wherein the curvature of the valve flap has, at least in the first surface section, a radius of curvature smaller than 1.00 m.

12. A three-way valve in accordance with claim 9 , wherein:

said second and third surface sections have a radius of curvature extending only around a single axis.

13. A three-way valve in accordance with claim 9 , wherein:

the valve flap is adapted for rotation around a pivot axis;

the second and third surface sections extend around the pivot axis at an angle of 48°

the first surface section extends around the pivot axis at an angle of 90°.

14. A three-way valve comprising:

a valve body defining a first fluid passage, a second fluid passage and a third fluid passage; and

a valve flap moveably arranged inside said valve body between a first position and a second position, said first position arranging said valve flap to connect said first fluid passage and said second fluid passage, said second position arranging said valve flap to connect said first fluid passage and said third fluid passage, said valve flap comprises a first surface section, a second surface section and a third surface section, said first surface section being arranged between said second surface section and said third surface section, said first surface section having a shape of a portion of a sphere, said second and third surface sections having a radius of curvature extending only around a single axis;

a pivot pin passing straight through said valve body and rotatably connecting said valve flap to said valve body about a pivot axis;

a curved baffle plate mounted on said pivot pin and movable with said valve flap.

15. A three-way valve in accordance with claim 14 , wherein:

said valve body has a T shape with a leg of said T shape defining said first fluid passage, and arms of said T shape defining said second and third fluid passages;

said curved baffle plate being shaped and mounted to guide a fluid from said first fluid passage to said second fluid passage in said first position of said valve flap, said curved baffle plate being shaped and mounted to guide a fluid from said first fluid passage to said third fluid passage in said second position of said valve flap.

16. A three-way valve in accordance with claim 15 , wherein:

said curved baffle plate and said valve flap being mounted on diametrically opposite sides of said pivot pin.

17. A three-way valve in accordance with claim 14 , wherein:

said second and third surface sections are shaped as a truncated cone.

18. A three-way valve in accordance with claim 15 , wherein:

said second and third surface sections extend around the pivot axis at an angle between 48° and 52°;

said first surface section extends around the pivot axis between 76° and 90°.

19. A three-way valve in accordance with claim 15 , wherein:

said second and third surface sections extend around the pivot axis at an angle of 52°;

said first surface section extends around the pivot axis at an angle of 76°.

20. A three-way valve in accordance with claim 15 , wherein:

said second and third surface sections extend around the pivot axis at an angle of 48°

said first surface section extends around the pivot axis at an angle of 90°.