Check Valve and Brake System including it

Disclosed are a check valve and a brake system including the same. The check valve, according to an embodiment of the present invention, comprises: a valve housing having a flow path penetrating the inside thereof; a first ball valve part provided at one side of the flow path; and a second ball valve part provided at the other side of the flow path. The first ball valve part includes: a ball opened and closed by selectively coming in contact with an orifice provided at the flow path; an elastic member of which one side is elastically supported by the ball; and a cap elastically supported by the other side of the elastic member and fixedly coupled to the valve housing. The second ball valve part includes: an elastic member of which one side is elastically supported inside the flow path; a ball elastically supported by the other side of the elastic member; and a seat which has a seat hole opened and closed by the ball selectively coming in contact therewith, and is fixedly coupled to the valve housing. In addition, the check valve including a first ball valve and a second ball valve is installed at a flow path for connecting a fluid pressure supply device and a hydraulic control device in the brake system so as to selectively transmit the fluid pressure of the fluid pressure supply device to a first hydraulic circuit or a second hydraulic circuit, wherein the brake system comprises: a reservoir; a master cylinder which is connected to the reservoir and has a master chamber and a piston to discharge oil according to the effort of a brake pedal; the fluid pressure supply device operating by an electrical signal to generate the fluid pressure; and the hydraulic control device having the first hydraulic circuit and the second hydraulic circuit to transmit the fluid pressure discharged from the fluid pressure supply device to wheel cylinders provided on two wheels respectively. According to the present invention, the number of components is decreased to reduce manufacturing costs and facilitate assembly work. 체크 밸브 및 이를 포함하는 브레이크 시스템이 개시된다. 본 발명의 실시 예에 따른 체크 밸브는 내부를 관통하는 유로를 갖는 밸브하우징과, 유로의 일측에 마련되는 제1볼밸브부와, 유로의 타측에 마련되는 제2볼밸브부를 포함하며, 제1볼밸브부는 유로에 마련되는 오리피스에 선택적으로 접촉하여 개폐되는 볼과, 볼에 일측이 탄성 지지되는 탄성부재와, 탄성부재의 타측에 탄성 지지되며 밸브하우징에 고정 결합되는 캡을 포함할 수 있고, 제2볼밸브부는 유로 내부에 일측이 탄성 지지되는 탄성부재와, 탄성부재의 타측에 탄성 지지되는 볼과, 볼이 선택적으로 접촉하여 개폐되는 시트공을 가지며 밸브하우징에 고정 결합되는 시트를 포함할 수 있으며, 제1볼밸브와 제2볼밸브를 포함하는 체크 밸브는 리저버; 리저버와 연결되고, 마스터 챔버와 피스톤을 구비하여 브레이크 페달의 답력에 따라 오일을 토출하는 마스터 실린더; 전기적 신호에 의해 작동하여