Angle type check valve

An angle type check valve comprising:

• a valve box main body which is provided with an inflow port opened on a lower side, an outflow port opened on a lateral side, and an access hole opened on an upper side, and in which a valve chamber is formed that is bent and extends from the inflow port toward the outflow port;
• a lid body which is configured to be attachable to and detachable from the valve box main body so as to seal the access hole;
• a valve seat which is provided with a valve port at a central portion of the valve seat;
• a valve body which is configured to be capable of changing posture between opening posture for opening the valve port and closing posture for closing the valve port;
• and
• a hinge mechanism which supports the valve body such that the valve body can swing between the opening posture and the closing posture and which includes a hinge shaft and an urging member that urges the valve body toward the closing posture,
• wherein as a valve unit, the valve seat, the valve body, and the hinge mechanism are integrally assembled so as to be made into a unit part, and the valve unit is configured so as to be attachable to and detachable from a unit fitting portion provided in the valve box main body, the unit fitting portion facing the inflow port,
• wherein the valve seat is provided with the gripping member configured to perform one of a fitting operation of the valve unit to the unit fitting portion through the access hole and a removal operation of the valve unit from the unit fitting portion through the access hole, and
• wherein the gripping member is formed so as to avoid a swing locus of the valve body about the hinge shaft.