From the model: \x0d\\\① rigid waterproof casing points: A type, B type, C type, A type applies to steel pipe, B type applies to cast iron pipe and ductile iron pipe; \x0d\\② flexible waterproofing casing points: A type, B type, A-type is used in the inner wall of the building, the B-type is used in the building's outer wall. \x0d\\ in the use: \x0d\ ① rigid waterproof casing is used in the wall of the building does not need to withstand pipeline vibration and expansion and deformation, and generally applicable wall thickness is 200mm; \x0d\ ② flexible waterproofing casing is mainly used in the seismic requirements to withstand pipeline vibration and expansion and deformation of the building's wall of the strict waterproofing requirements, and the general application of the wall thickness is 300mm\. x0d\from the structure: \x0d\① rigid waterproof casing is welded on the outside of the steel pipe with a waterproof wing ring; \x0d\② flexible waterproof casing is welded on the outside of the steel pipe with three wing ring, one side of the four screws, inside welded a stopper, plus an adhesive ring, the outside and then do a flange, plus four double-sided bolts, welded on the head of the steel pipe, after the pipeline is installed, the flange is placed on the screws, the more tight the adhesive ring is larger, the more tight the screws, the more the flange is placed on the flange, the more the screws. The tighter the rubber ring, the larger, the less water leakage, generally used in places with high waterproofing requirements, such as pool outlets. \x0d\\ from the outside: \x0d\\① rigid waterproof casing is only composed of steel casing and wing ring, simple structure; \x0d\② flexible waterproof casing is mainly composed of: flange casing, sealing ring, flange pressure plate, wing ring, bolts, nuts, complex structure. \x0d\\ from the waterproof performance to choose: \x0d\ ① rigid waterproofing casing is a steel pipe plus a wing ring (ring made of steel plate on the steel pipe), installed in the wall (mostly concrete walls), for general pipeline through the wall, conducive to the waterproofing of the wall; \x0d\ ② flexible waterproofing casing in addition to the external wing ring, the internal has a gear ring and so on, flange wire, there are sets of sold, but also can be processed, used for vibration-damping The need for piping, such as and pumps connected to the pipeline through the wall. \x0d\\that is to say, if you consider the waterproof performance of the two sides of the wall, you have to choose a flexible waterproof casing; if you just consider the pipe through the wall, and do not consider wearing the wall, the waterproof performance of the two sides of the wall, as well as the pipe's displacement deformation, you can choose a rigid waterproof casing.