Valves are indispensable control components in pipeline systems, used to regulate, guide or control the flow of fluids. As the "switch" and "regulator" of fluid delivery systems, valves play a vital role in many fields such as petroleum, chemical industry, electricity, water conservancy, urban construction, etc.
Main functions of valves
Stop function: fully open or close the fluid channel
Regulation function: accurately control flow and pressure
Prevent backflow: prevent the medium from flowing in the opposite direction
Safety protection: automatically release pressure when overpressure occurs
Diversion function: change the flow direction of the medium or distribute the flow
Classification of valves
Classification by purpose
Stop valve: gate valve, stop valve, plug valve, etc.
Regulating valve: throttle valve, pressure reducing valve, etc.
Check valve: prevent backflow of the medium
Diversion valve: distribute or mix the medium
Safety valve: overpressure protection
Classification by structure
Gate valve: good sealing, small flow resistance, suitable for fully open and fully closed occasions
Stop valve: good regulation performance, but large pressure drop
Ball valve: easy to operate, reliable sealing
Butterfly valve: simple structure, light weight, suitable for large pipe diameters
Plug valve: fast switching, low fluid resistance
Valve material selection
Valve materials should be selected according to medium characteristics, temperature and pressure and other working conditions:
Cast iron valve: suitable for low pressure, normal temperature water and gas
Cast steel valve: resistant to high pressure and high temperature, used in steam and oil systems
Stainless steel valve: corrosion-resistant, used in chemical and food industries
Special alloy valve: used for extreme temperatures and corrosive media
Valve application areas
Petrochemical: oil refining equipment, pipeline transportation, chemical plants
Electric power industry: boiler system, steam turbine, cooling system
Water supply and drainage engineering: water plant, sewage treatment, municipal pipeline network
HVAC: heating system, refrigeration cycle
Shipbuilding: marine piping system
Pharmaceutical food: medium control in sterile environment
