Fluid resistance is small, distressed brush and erosion of the sealing surface by the media. Open and close more effort. Medium flows unrestricted, spoiler, do not reduce the pressure. A simple shape, the short length of the structure, and good manufacturing processes, and a wide range of application. Valve defects as follows: between the sealing surface could easily cause erosion and abrasion, maintenance more difficult. Dimensions larger open r...

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