Flexible waterproof sleeve switch too fast will lead to flexible waterproof sleeve distortion load is too large. And make the valve stem damage; switch too slow will lead to a longer period of time by the flexible waterproof casing surface media wash and wear. Therefore, the operating time should be kept within a suitable range. According to experience, the range of flexible waterproof casing switching time (seconds) control, the lower limit can be half of the nominal size of the flexible waterproof sleeve (inches), the upper limit can be estimated by the nominal size of the flexible waterproof casing (inches) 5 times.
The role of the flexible waterproof casing is to prevent the pressure of the medium in the pipeline or device exceeds the specified value, so as to achieve the purpose of protection. After the pump starts, the pressure at the inlet of the flexible waterproof casing gradually rises, while the pressure water slowly enters the diaphragm cavity through the connection tube at the inlet of the flexible waterproof casing to achieve the slow opening of the main valve plate, the opening speed can be adjusted by the flexible waterproof casing.
Water pump shutdown, the pressure of the flexible waterproof casing inlet decreases, when close to zero flow, the wall is quickly closed under its own gravity. Because the pressure at the inlet end of the flexible waterproof casing is reduced, the pressure water at the outlet end of the flexible waterproof casing enters the upper chamber of the diaphragm through the connecting tube, and the water in the lower chamber is pressed back to the inlet end of the flexible waterproof casing through the connecting tube at the inlet end of the flexible waterproof casing, and the slow closing valve plate is slowly closed, and the slow closing time can be adjusted by the flexible waterproof casing. The speed closure of the main valve plate and slow closure of the slow closing valve plate conforms to the two-stage closure rule.、
Whether it is pre-buried in the wall body of rigid waterproof casing and flexible waterproof sleeve by the concrete pouring and reinforcement structure into a complete wall, some poor quality concrete pouring after the surface there are some tiny cracks and perforations, these tiny gaps for waterproof casing material iron ions to create a space for movement, and the degree of corrosion and oxidation of waterproof casing depends on the material ion diffusion depends on the material ion diffusion rate caused by large area oxidation corrosion. Waterproof casing anti-corrosion importance to be first to its surface and inner tube rust removal treatment, you can use manual rust removal, you can also use spray rust removal, such as no special requirements, waterproof casing and the media or atmospheric contact surface spraying rustproof primer, topcoat each two, such as contact with drinking water metal surface should be coated with non-toxic epoxy primer, topcoat each two. Waterproof casing is simple and straightforward is to paint asphalt anti-corrosion paint.
