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Galvanization involves coating iron or steel with zinc to prevent rusting. While this treatment extends the life of pipes, it also alters their surface texture. The roughness created by the galvanization process can increase the friction factor compared to smooth-walled pipes. This increase implies greater energy requirements for pumping fluids through galvanized pipes, particularly in systems that rely on water or other low-viscosity fluids.
friction factor of galvanized iron pipe factories

The primary function of a gas pressure reducing valve is to decrease and stabilize the pressure of a gas entering a system. When gas flows from a high-pressure source, such as a gas main, to a lower-pressure distribution system, the PRV adjusts the pressure to a predetermined level suitable for the downstream equipment. The valve operates on the principle of a diaphragm mechanism, where changes in downstream pressure result in adjustments to the valve opening, maintaining the desired output pressure.