Liquid chlorine lined fluorine ball valve is a valve specifically designed for transporting and controlling liquid chlorine media. Its core feature is the use of fluoroplastic lining, combined with the structural advantages of ball valves, which can effectively cope with the strong corrosiveness of liquid chlorine, while ensuring flexible opening and closing and reliable sealing.
Liquid chlorine lined fluorine ball valves are mainly used in industrial fields involving liquid chlorine storage, transportation, metering, and control. Typical scenarios include:
Chemical industry: Liquid chlorine pipeline systems for chlor alkali chemical (electrolytic salt water production of liquid chlorine), pesticide production (synthesis of chlorine containing pesticides), dye intermediate manufacturing, and other processes.
Water treatment industry: Liquid chlorine disinfection systems for water plants and sewage treatment plants (liquid chlorine, as a disinfectant, requires precise control of the dosage through valves).
Metallurgical industry: Pipeline control using liquid chlorine as an oxidant or chlorinating agent in certain metal smelting processes.
Storage and transportation: The inlet and outlet pipelines of liquid chlorine storage tanks, as well as the connecting pipelines of tank truck loading and unloading arms, are used to cut off or adjust the flow rate of liquid chlorine.
Key points of selection
Confirmation of specification parameters
Nominal diameter (DN): Select based on the inner diameter of the pipeline, with common specifications ranging from DN15 to DN300. It should be matched with the pipeline system to avoid excessive flow resistance or leakage caused by mismatched diameters.
Nominal pressure (PN): Liquid chlorine storage and transportation are usually carried out at a certain pressure (such as tank pressure of about 0.6-1.0MPa), and valves with a pressure rating not lower than the actual working pressure (such as PN1.6MPa, PN2.5MPa) should be selected to ensure pressure safety.
Temperature range: Considering the low-temperature characteristics of liquid chlorine (possibly as low as -40 ℃) and ambient temperature, select valves with fluorine lining materials within the applicable temperature range (PTFE long-term use temperature is -200 ℃~260 ℃, which can meet the requirements of liquid chlorine scenarios).
Selection of fluorine lining materials
PTFE (polytetrafluoroethylene): It has the best corrosion resistance and a wide range of applications, but its hardness is relatively high. Long term use may lead to a decrease in sealing performance due to wear, making it suitable for medium frequency operation scenarios.
FEP (perfluoroethylene propylene): Corrosion resistance similar to PTFE, better flexibility, more stable sealing performance, suitable for frequent opening and closing or occasions with extremely high sealing requirements, but slightly higher cost.
PFA (soluble polytetrafluoroethylene): It has better high temperature resistance than PTFE, good processing performance, and is suitable for high temperature conditions (but this advantage is not prominent in liquid chlorine scenarios where the temperature is lower).
connection method
According to the selection of pipeline connection forms, common ones include:
Flange connection: The most widely used, reliable sealing, suitable for medium and high pressure, large-diameter pipelines (such as DN50 and above).
Threaded connection: Suitable for small-diameter pipelines (DN15-DN40), easy to install, but attention should be paid to thread sealing (usually using PTFE tape for auxiliary sealing).
Welding connection: suitable for scenarios with high pressure and high sealing requirements, avoiding possible leakage risks of flange connections, but inconvenient for disassembly and maintenance.
Type of executing agency
Manual: Suitable for situations with low operating frequency and no need for remote control, with low cost.
Pneumatic: Driven by compressed air, with fast opening and closing speed, suitable for automated production lines or hazardous areas (to avoid manual operation risks), requiring a matching air source treatment device.
Electric: Driven by a motor, precise flow regulation and remote control can be achieved, suitable for intelligent systems, but the cost is high and explosion-proof requirements need to be considered (liquid chlorine is a hazardous medium, and electric actuators need to be explosion-proof).
Explosion proof and safety requirements
Liquid chlorine is a highly toxic and flammable medium. If leaked and comes into contact with combustible materials, it may cause an explosion. Therefore, valves and supporting actuators must meet explosion-proof level requirements (such as Ex d IIBT4), and the valve body material must have sufficient strength to avoid shell rupture caused by external collision.