The Dart Style Valve is constructed of a twopiece body that houses an inline spring loaded dart. When fluid enters from the inlet side, it will overcome the low spring force on the dart. The dart will travel away from the inlet and allow the fluid to flow around towards the outlet. When fluid flow stops, the light spring force closes the dart against its seat, preventing fluid from flowing back through the flow line. The SPM® Dart Style Check Valve is available for standard service, CO2/Nitrogen compatible and for sour gas (H2S) environments.