Abstract: A check valve is provided in a refrigerant piping line of a refrigerant piping system to restrict a flow direction of refrigerant. The check value includes a valve body movably disposed inside the refrigerant piping line in a longitudinal direction of the refrigerant piping line, a stopper coupled to a rear end of the valve body to limit a movement of the valve body, and an elastic member disposed between the valve body and the stopper and providing an elastic force to the valve body. The valve body may have at least one locking protrusion formed at the rear end thereof, and the stopper may have a corresponding locking slit. The locking protrusion may pass through the locking slit and then rotate relatively whereby the stopper can be fixed to the valve body.

Abstract: A plate-type heat exchanger including a body plate, an upper plate, and a lower plate. The body plate includes a plurality of alternately stacked plates, a space between the plurality of plates having a first heat exchange passage through which a first refrigerant of high temperature and high pressure flows, and a second heat exchange passage through which a second refrigerant of low temperature and low pressure flows. A heat exchange between the first refrigerant and the second refrigerant is performed in the body plate. The upper plate is bonded to a front side of the body plate and having a first inlet hole through which the first refrigerant is introduced and a first outlet hole through which the second refrigerant is discharged. The lower plate is bonded to a rear side of the body plate and having a second inlet hole through which the second refrigerant is introduced and a second outlet hole through which the first refrigerant is discharged.

Abstract: A piping system for an air conditioner that includes a refrigerant pipe that is formed of a plastic material and has a multi-layered pipe structure including an outer layer and an inner layer. The piping system provides a fluid flow between parts constituting the air conditioner system. A first flange formed of the plastic material and providing a connection between the refrigerant pipe and components constituting the air conditioner system. A second flange formed of the plastic material and connected to a charging valve for injecting a refrigerant into the refrigerant pipe.

Abstract: A brake hose comprising according to the disclosure may include: a tube-shaped inner rubber layer filled with a brake fluid; and a first reinforcing fiber layer, an intermediate rubber layer, a second reinforcing layer, and an outer rubber layer, which sequentially surround an outer circumferential surface of the inner rubber layer, wherein the first reinforcing fiber layer has a structure in which a plurality of layers of butyl rubber, which is a material having a high loss factor, are stacked on a PET fiber to improve vibration insulating performance, and various exemplary embodiments may be possible.

Abstract: A plate-type heat exchanger including a body plate, an upper plate, and a lower plate. The body plate includes a plurality of alternately stacked plates, a space between the plurality of plates having a first heat exchange passage through which a first refrigerant of high temperature and high pressure flows, and a second heat exchange passage through which a second refrigerant of low temperature and low pressure flows. A heat exchange between the first refrigerant and the second refrigerant is performed in the body plate. The upper plate is bonded to a front side of the body plate and having a first inlet hole through which the first refrigerant is introduced and a first outlet hole through which the second refrigerant is discharged. The lower plate is bonded to a rear side of the body plate and having a second inlet hole through which the second refrigerant is introduced and a second outlet hole through which the first refrigerant is discharged.