US 7,448,593 B2
	Butterfly valve having flanges forming a positive lock
Korf Madsen Lasse, Odense S (Denmark)
Assigned to Alfa laval LKM A/S, Kolding (Denmark)
Appl. No. 10/578,165 PCT Filed Apr. 21, 2004, PCT No. PCT/EP2004/004200 § 371(c)(1), (2), (4) Date May 04, 2006, PCT Pub. No. WO2004/102047, PCT Pub. Date Nov. 25, 2004.
Claims priority of application No. 103 22 280 (DE), filed on May 16, 2003.
Prior Publication US 2007/0023727 A1, Feb. 01, 2007
Int. Cl. F16K 1/22 (2006.01)

U.S. Cl. 251—148  [251/306; 285/365]

8 Claims

1. Throttle flap valve having an essentially ring-shaped, elastic seal element (4) that surrounds an axial opening, having a valve disk (6) disposed to rotate in the axial opening, crosswise to the axial direction, having means for turning the valve disk (6) between the open and the closed positions, to control a flow of fluid through the opening, having at least two valve housing parts (5) configured as two clamp halves (5) that essentially surround the seal element (4) in ring shape, which surround two flanges (3) connected with an inflow (1) and an outflow (2), the clamp halves having inner surfaces in contact with the seal element (4) comprising two ring-shaped depressions (10) surrounding the flanges (3), in each instance, wherein the depressions (10) are raised higher than the portion of the clamp halves in contact with the seal element (4), whereby conical contact surfaces of the flanges (3) and/or the valve housing parts (5) work together in such a manner that the flanges (3) are pressed axially against the seal element (4), forming a seal, by means of the valve housing parts (5), in the assembled state ready for operation, wherein the flanges (3) are rigidly connected with the valve housing parts (5), forming a positive lock, in each instance, and wherein the flanges (3) are shaped to have rotation symmetry.