Flap valve has housing with leg spring, with one spring leg held non-turnable on hinge pin to ensure closing function of valve

摘要

The valve has a valve flap (16) fastened by a hinge (20) in a valve seat (14) in the valve housing (12). The hinge is held by a peg (26) and has a leg spring (30). A first spring leg (32) tensions the flap in closing direction, while a second leg (34) engages on the inner wall of the valve housing and is tensioned against it. The spring is a spring wire wound around the hinge pin (24). The valve housing is shaped like a cylindrical tube section and the valve flap is curved so that when open it engages smoothly on the inner housing wall.