The non electric ball valve is composed of one layer of silicone tape, two layers of alkali free glass fiber cloth and one layer of tetrafluoro cloth. This design simplifies the support design, can compensate the axial, transverse and angular displacement of the pipeline, and has the functions of simple erosion resistance, high temperature resistance, noise elimination and shock absorption. It is widely used in hot air pipeline and smoke and dust pipeline because of different use environments, This results in different service life of the product.
Since the structural materials of non electric ball valves are all soft fabric materials, when fixing screws, it is necessary to fix the cloth on the one hand, and on the other hand, compress the skin for sealing, so that the pipeline will not leak. During installation, the front screw will loosen after the rear screw is tightened, causing the accumulated acid water to seep out to the screw length for erosion, thus eroding the spiral, severely reducing the service life of the product, so the screws need to be tightened repeatedly during installation. In addition, during the operation of the non electric ball valve, due to shock and other reasons, the screws may also become loose, resulting in pipeline leakage and product damage. Sometimes the pull rod breaks due to the movement of the pipe, which will directly break the skin, making it unable to work normally.