CHECK VALVE HAVING CRACKING PRESSURE ADJUSTMENT FUNCTION

The present invention relates to a check valve which can easily adjust cracking pressure without replacement of a spring though screw-type adjusting of the elastic force of the spring, and which can prevent the occurrence of chattering. The check valve according to one aspect of the present invention may comprise: a first valve body connected to a pipe through which fluid is supplied; a seat, which is disposed at the front end portion of the first valve body and has a flow path on which the fluid flowing through the pipe flows; a poppet, which is movably provided in an inner space of the first valve body so as to open/close the flow path while coming into close contact with or being spaced apart from the rear end portion of the seat; the spring for providing the elastic force by which the poppet is pressed toward the seat in the inner space of the first valve body; a spring support member, which is provided at the rear end portion of the first valve body so as to be movable in the forward and backward directions, and supports the rear end portion of the spring; a second valve body, which communicates with the rear end portion of the first valve body and is connected to the pipe through which the fluid is discharged; and an elastic force adjustment member, which is disposed between the rear end portion of the first valve body and the front end portion of the second valve body so as to move the spring support member in the forward and backward directions with respect to the first valve body by means of external force, thereby adjusting the elastic force of the spring. La présente invention concerne une soupape anti-retour qui peut facilement ajuster la pression d'ouverture sans remplacement d'un ressort par réglage du type vis de la force élastique du ressort, et qui peut empêcher l'apparition d'un claquement. La soupape anti-retour selon un aspect de la présente invention peut comprendre : un premier corps de soupape relié à un tuyau à travers lequel un fluide est alimenté ; un siège, qui est disposé au niveau de la partie d'extrémité avant du premier corps de soupape et présente un trajet d'écoulement sur lequel s'écoule le fluide s'écoulant à travers le tuyau ; un clapet, qui est disposé avec mobilité dans un espace interne du premier corps de soupape de façon à ouvrir/fermer le trajet d'écoulement tout en venant en contact étroit avec la partie d'extrémité arrière du siège ou étant espacé de celle-ci ; le ressort pour fournir la force élastique par laque