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The F-2804 Series Check Valves permit flow in one direction only, with operation based in the movement of a small disc. The disc shifts within the housing as the pressure differential changes from forward to reverse. A flat surface on one side of the disc seals off flow, while the other side allows flow to pass.
Five models are available: The Polypropylene Unit, F-2804-400, the Standard Units, F-2804-401, 402, and 403 and the High Flow Unit, F-2804-404.
Advantages include low "cracking pressure" and a minimum differential for forward flow, less than 0.005 PSI in the Standard Units. Further, there is no residual pressure difference across the check valve once the flow has ceased. Flow in the forward direction is relatively unrestricted, approximately equivalent to the restriction of a 0.040" orifice in the Standard Units. The amount of flow permitted in the reverse direction, which is the sealing side, and the forward direction, which is full flow, is shown in the graph below. |
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