Different constructions give each type of hose different characteristics.
The most basic difference has to do with whether the hose is made of a single layer or multiple layers. Single-layer hoses are of course made with a single type of material. These can be used in situations where no pressure is applied during use.
The multiple-layer hoses come in three types: 1. hoses with different materials on the inside and outside to provide various characteristics, 2. hoses with threads woven into the middle layer, and 3. hoses with a construction of metal or plastic wire.
1. With the first type, different colors of hoses can be used to indicate the fluid inside or the direction of flow. Also, a combination of chemical resistance and flexibility is made possible using a fluororesin inside and a vinyl chloride construction on the outside.
2. The braided construction of the second type provides high pressure resistance for high-speed conveyance. This type is not made to withstand negative pressure (suction), however.
3. The third type features coiled reinforcement for resistance against crushing to maintain a flow path even when the hose is bent tightly. These can handle fluids even in a suction as they do not buckle under negative pressure. They are not as resistant to pressure, however, as the braided type.
