According to the literature, the elasticity of these leather balls made the visiting Spaniards think that these leather balls were possessed by evil spirits. Valves are also used as straps to fasten wooden handles to stone or metal tools, and as fillers for handles. Mayans can use valves to make shoes. Although the Central American aborigines do not vulcanize the valve formally as modern people do, they can still use organic substances to achieve similar functions, such as mixing unprocessed emulsions with sap of different varieties of trees or juice of some rattan plants. Some Brazilian aborigines will use the valve to make waterproof cloth.
It has been reported that Portuguese people brought these clothes back to their motherland, frightened their fellow villagers, and were accused of witchcraft and sentenced.
The online quotation of Shijiazhuang single ball electric ball valve manufacturer is based on the different medium characteristics of different pipelines, and the valve types are reasonably matched, so that this special type of electric ball valve has the ability to adapt to the current working environment. For example, if it is an oil pipeline, we will use D valve, In this way, the oil can have a negative impact on the erosion and expansion of ordinary valves, thus improving the stability and safety of pipeline operation. Electric ball valve is also called valve electric ball valve, flexible electric ball valve, flexible electric ball valve, valve shock absorber, etc. The product is mainly composed of tubular valve parts composed of inner and outer rubber layers, cord layers and steel wire rings, which are vulcanized at high temperature and high pressure and then combined with metal flange loose sleeves. It is widely used in fire protection, chemical industry, pump valve and other pipeline systems, playing the role of earthquake resistance and noise reduction, and absorbing the displacement generated during pipeline operation.