Check valves are installed in pipelines and are used to protect them from the reverse flow of the transported medium, ensuring the passage only in a given direction and automatically shutting off the flow in case of a reverse flow. Are applied on pipelines of hot and cold water supply, heating, compressed air, and liquids which are not aggressive to materials of the valve. Maximum operating temperature +90 °С. Nominal pressure - 16 bar. The direction of flow is indicated by an arrow on the body. This non-return valve is mounted in a horizontal position only.