The functionality of PVC hoses relies on their multi-layer composite structure to facilitate fluid transport and provide pressure resistance; the core operating logic varies depending on the specific type of hose.
Basic Fluid Transport Principle
Standard PVC hoses are primarily made of modified PVC. Their inherent flexibility allows for bending to fit piping layouts, while a smooth inner wall minimizes fluid transport resistance. The chemical stability of the PVC material enables resistance to mild corrosion from common media-such as water, gases, and dilute acids or alkalis-thereby facilitating the directional transport of fluids.
Core Principles of Pressure-Reinforced Hoses
Mainstream high-pressure PVC hoses-often featuring a "three-layer PVC, two-layer reinforcement" design-utilize an inner PVC layer to seal the fluid. An intermediate braided layer (made of polyester fiber or galvanized steel wire) disperses the tension generated by the fluid and counteracts the expansion forces caused by high pressure, allowing the hose to withstand operating pressures of 2–10 MPa and preventing rupture.
Operating Logic of Specialized Hoses
Spiral steel wire-reinforced PVC hoses utilize an internal wire skeleton to resist external crushing and internal negative pressure; this prevents the hose from collapsing or flattening, maintains unobstructed flow, and makes them suitable for water pumping and negative-pressure transport applications.
Plastic-coated PVC hoses feature an outer PVC layer that provides insulation and waterproofing, while an inner metal skeleton handles tensile loads, offering structural support and protection for cables during bending.
