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When pressure fails or is reduced in a pipe network as may happen if a pipeline bursts or freezes up, the resulting backflow may expose the system to unfortunate consequences such as contamination. However, a PVC-U wafer check valve has now been introduced by Praher Valves that will prevent such an occurrence. Once installed between two flanges in a pipeline, it ensures that fluids can pass in the direction of flow, but prevents backflow of fluids by closing of a neatly designed flap.

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