VALVE ELEMENT STOPPER STRUCTURE FOR SWING CHECK VALVE

摘要

PROBLEM TO BE SOLVED: To receive a load from a valve element axially on an adjusted stopper even when the opening angle of the valve element is changed. SOLUTION: A valve element stopper structure for a swing check valve abuts stoppers 20 against valve elements 15a and 15b of a two-bladed butterfly type to position the valve elements 15 at given opening angles. The stoppers 20 comprise a support rod 21 and a stopper rod 22 threaded thereinto. The support rod 21 is threaded into the internal surface of a valve casing 11 and fixed with a nut 24. The stopper rod 22 is adjusted in the degree of projection by the degree of threading and fixed with a nut 25. The support rod 21 is rotated about the axis to set the axis of the stopper rod 22 perpendicular to the valve element 15 in the given opening position. The stopper rod 22 is next moved back and forth to set the tip in correspondence with the valve element 15 in the given opening angle position. Even when the opening angle of the valve elements 15 is changed, the operation causes the stoppers 20 to receive an abutting load axially and to chip little owing to a bending load and the like.