Manual flapper valve has the following advantages: More information: 151287407501. Fluid resistance, the pipe resistance coefficient equal to the same length. 2. Simple manual gate valve structure, small size, light weight. 3. Close and reliable valve sealing surface material widely used plastic, sealing, have been widely used in the vacuum system. 4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control. 5. Easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient. 6. In the fully open or fully closed, sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface. 7. Wide range of applications, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied. ①. Manually install the flapper valve and shut off from the opening acts on a variety of powder materials pipes under pressure. The maximum working pressure up to 1MPa. ②. Manual flapper valve having good sealing characteristics leak inside or outside, easy to wear parts made of wear-resistant material, while the structure of the valve fully into account the characteristics of powder materials, the valve is rare material card lived phenomenon can not slide valve plate