| 摘要 |
<p>PCT No. PCT/ES96/00093 Sec. 371 Date Sep. 10, 1996 Sec. 102(e) Date Sep. 10, 1996 PCT Filed Jan. 10, 1996 PCT Pub. No. WO96/21815 PCT Pub. Date Jul. 18, 1996A shut-off or throttle valve comprises a housing (12) defining a flow passage and a valve flap (18) to be pivoted about an axis of rotation (20) extending across the flow cross-section of the valve. The valve flap (18) in its closed position is located in a closing plane containing said axis of rotation and extending transversely to the direction of fluid flow and is spaced at its edges in all positions from the housing such that the respective spacing cannot be overcome by thermal expansions to be expected in operation. The peripheral portions of the valve flap (18) cooperate with abutment edges (34, 36) serving as a front seal. The flap surface is subdivided by the axis of rotation (29) into a pair of sections. Each section has associated therewith an abutment edge (34, 36) extending towards the axis of rotation (20), such that the abutment edges (34, 36) are positioned on opposite sides of the valve flap (18).</p> |
