| 摘要 |
A check valve for controlling the flow of fluid in a conduit so that flow in one direction is unimpeded and flow in the opposite direction is prevented which provides in the open position an unimpeded fluid passage permitted the passage of cleaning tools or material separators through the valve. A valve seat and an arcuate valve sealing member are formed with mating bi-planar sealing surfaces, the valve seat being formed by making intersecting 45 degree cuts from the transverse end plane of a tubular member to the horizontal diametral plane and the valve sealing member being formed by making 45 degree intersecting cuts from the periphery of a corresponding tubular member to the horizontal diametral plane, producing an arcuate member, which in the open position has the configuration of the interior of the valve body.
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