Sanitary Valve in the Chemical Industry:

① Flow Control: They precisely regulate the flow of chemical fluids. In petrochemical production, regulating valves can control the feed rate of raw materials to an appropriate level based on the progress of the reaction within the reactor. For example, when synthesizing a polymer, the reaction requires a specific ratio of monomer raw materials. A valve acts as a precise "flow manager," ensuring that each monomer enters the reactor at the correct flow rate, ensuring the smooth progress of the polymerization reaction and producing a polymer product that meets quality standards.

② Pressure Control: They effectively regulate pressure within chemical systems. In high-pressure chemical pipeline systems, when excessive pressure could damage pipelines and equipment, valve devices such as safety valves can release excess pressure, keeping system pressure within a safe range. For example, in large refineries, the pipeline pressure in atmospheric and vacuum distillation units is high. Safety valves monitor the pressure in real time. If the pressure exceeds the set value, the valve opens to release pressure, preventing pipeline rupture due to overpressure and preventing serious safety accidents.

③ Shutoff: They can completely cut off or restart the flow of chemical fluids. During maintenance on chemical plants, it's necessary to close relevant valves to cut off fluid flow and ensure maintenance personnel can operate in a safe environment. For example, when performing internal maintenance on a reaction tower in a chemical plant, closing the feed and discharge valves connecting the tower can prevent the leakage of hazardous chemicals within the tower and ensure the safe conduct of maintenance work.

④ Preventing Backflow: Check valves and other valve types can prevent the backflow of chemical fluids. In chemical production circulation systems, backflow can disrupt the entire process and even damage equipment. For example, in the condensate recovery system of a thermal power plant, check valves ensure that condensate flows only toward the recovery unit, preventing it from flowing back into the steam pipeline, ensuring normal system operation and improving energy efficiency.
⑤ Distributing Fluids: Chemical fluids can be distributed to different equipment or pipeline branches. In large chemical complexes, multiple branch pipelines extend from a main pipeline. Distribution valves can effectively distribute raw materials or intermediate products to various production workshops or equipment. For example, ammonia produced by a synthetic ammonia plant is distributed in varying proportions to different subsequent processing units, such as the urea production workshop and the nitric acid production workshop, through distribution valves to meet the production needs of different products.
⑥ Temperature Regulation: Some valves can indirectly regulate temperature by controlling fluid flow. In chemical heat exchange systems, regulating valves adjust the flow of hot or cold fluids, thereby controlling the degree of heat exchange and achieving precise control of process temperature. For example, in the production of pharmaceutical intermediates, reactions must occur within a specific temperature range. By adjusting valves on the heat exchanger to control the flow of the heating or cooling medium, the reaction temperature can be stabilized at an appropriate value, ensuring consistent product quality.
⑦ Isolation Equipment: Valves can isolate different chemical equipment. Within a chemical plant, different equipment may be in different operating states or require separate maintenance. By closing the valves connecting these equipment, a specific piece of equipment can be isolated from other operating equipment without disrupting the normal operation of the entire system. For example, when cleaning a small catalyst storage tank, closing the inlet and outlet valves connecting the tank can isolate the tank from the entire production process, allowing for safe internal cleaning. ⑧ Controlling Reaction Progress: During chemical reactions, valves can control the timing and amount of reactant additions according to reaction requirements, thereby controlling the reaction's progress. In fine chemical production, the synthesis of high-value-added products often requires the addition of different reactants according to specific steps and timings. Automated valve control systems can precisely control the opening and closing times of each reactant's feed valve, ensuring the reaction proceeds along the intended path and improving product yield and purity.

⑨ Ensuring Safety: Safety valves, such as emergency shut-off valves, play a critical role in emergency situations during chemical production. In the event of a major incident such as a fire or leak in a chemical plant, emergency shut-off valves can quickly shut off the flow within the relevant pipelines, preventing further leakage or spread of hazardous chemicals and minimizing the harm caused by the accident. For example, if a fire breaks out in a chemical park, emergency shut-off valves installed on the pipelines of hazardous chemical storage tanks will respond quickly, severing the tank's connection to the outside world, preventing a large-scale leak of chemicals from the fire and minimizing harm to the surrounding environment and personnel.

⑩ Stabilizing System Operation: Proper valve adjustment can maintain stable operation of the chemical system. In continuous chemical processes, valves must adjust in real time based on changes in various parameters to ensure material and energy balance across the entire system. For example, in a large polyester production facility, precise control of feed and discharge valves, as well as valves in various circulation pipelines, ensures stable material flow between different reaction stages and processing units within the facility, maintaining continuous and stable production, and improving production efficiency and product quality.
⑪ Meeting Diverse Process Requirements: Chemical production processes are diverse, and valves can adapt to the fluid control requirements of each process. In some chemical processes requiring precise pH control, electric control valves are used to control the flow of acid-base neutralizers to achieve specific pH requirements. In food additive production processes, fluid cleanliness requirements are extremely high. Hygienic-grade valves are used to meet these control requirements, such as flow and pressure, while ensuring that the production process complies with food hygiene standards and prevents product contamination.
⑫ Monitoring and Maintenance Systems: Certain valve characteristics can reflect the operating status of the chemical system, facilitating monitoring and maintenance. For example, by observing valve opening and closing conditions, pressure fluctuations, and leaks, potential system problems can be promptly identified. If a valve vibrates frequently or makes abnormal noise, it may mean that there is fluid impact in the pipeline or that the valve itself is faulty. Timely inspection and repair are required to ensure the normal operation of the entire chemical system.