Use
The ZNF series check valve is a type of backflow preventer that functions in a unidirectional manner within piping systems, preventing the medium from flowing backward. It is widely used in piping systems across various industries.

Working principle
The ZNF series check valves use rubber components for sealing. When the medium flows in the direction indicated by the valve’s arrow, the pressure causes the rubber component to lift away from the valve core surface, thereby opening the valve. When the medium flows in the reverse direction—opposite to the arrow—under the action of pressure, the rubber component tightly adheres to the valve core surface, thus closing the valve.

Technical Parameters
Nominal pressure: 1.6 MPa
Medium temperature: -40℃ to 150℃
Strength test: 2.4 MPa
Sealing test: 1.76 MPa
Medium: Clean, dry compressed air

Install
The medium flow direction is consistent with the arrow on the valve, and it can be installed at any angle.

Main connections and external dimensions