Patent ID: 6494434
Filing Date: 2002-12-17
Classification: F16K,Y10T

Abstract:
A butterfly valve comprising:a valve housing with a valve opening and a valve seat, said valve housing enclosing a vacuum area of the valve; a valve plate which is mounted at a valve rod guided through the valve housing and which is pressed against the valve seat in!a closed position of the valve, tilted relative to the valve seat in a partially open position of the valve through tilting of the valve rod about a tilting axis, and tilted and rotated relative to the valve seat in a completely open position of the valve by subsequent rotation of the valve rod about its longitudinal axis; said valve rod having portions extending on both sides of the tilting axis, the portion located on one side of the tilting axis acting centrally at the valve plate and the portion located on the other side of the tilting axis being connected to an actuating member; said connection to said actuating member being made by a link guide which is located outside the vacuum area and which has a link with a part extending at an inclination to the longitudinal axis of the valve rod and with a helical surface-shaped part and a journal which is guided in the link; said actuating member being mounted so as to be displaceable in the axial direction of the valve rod.