Check valve is a mechanical device for passing, shutting off or regulating the flow of liquid, steam or gas in pipelines. It is also called a one-way valve. The pressure of the fluid passing through the pipeline opens the valve, while any change in flow will close the valve. It provides full, unobstructed flow and automatically shuts off when pressure drops. Discharge lines for rotating equipment such as pumps and compressors must be fitted with a non-return valve to prevent backflow.Materials of manufacture: the spring of the check valve is made of high quality stainless steel. Check valve carcass and stem are made of brass series LS-59-1 GOST 15527 by hot stamping. The check valve carcass has an arrow indicating the flow direction. The temperature of use is from 1 to +175 ° С at a nominal pressure PN 1.6 MPa (16 kgf / cm2). The valve design is simple, reliable and durable. The check valve can be installed in any position: vertically, horizontally, obliquely.