The application of automatic valves in light industries (such as food and beverage, pharmaceuticals, daily chemicals, papermaking, textiles, etc.) is mainly focused on health and safety, precision control, energy conservation and environmental protection. Since light industries usually involve high cleanliness, corrosive media, high-precision proportioning and other requirements, the selection and use of automatic valves are significantly different from those in the chemical and petroleum industries. The following is a detailed application analysis:

1. Main application scenarios
(1) Food and beverage industry
● Aseptic filling system:

- Sanitary butterfly valve/diaphragm valve (316L stainless steel, EPDM seal): used for aseptic delivery of fluids such as milk, juice, beer, etc. to prevent microbial contamination.

- CIP (cleaning in place) system: pneumatic ball valve controls the circulation of cleaning agents (acid/alkali) to ensure equipment hygiene.

● Batching and mixing:

- Proportional control valve: accurately control the proportion of syrup, flavor, and additives (such as cola production line).

(2) Pharmaceutical industry
● Bioreactor and purification system:

- Aseptic diaphragm valve (PTFE lining): prevents cross contamination of drugs and complies with GMP/FDA requirements.

- Pure steam system: bellows-sealed stop valve to ensure no leakage and prevent impurities from entering.

● Pharmaceutical water system:

- Sanitary ball valve: used for WFI (water for injection) and purified water pipelines to prevent bacterial growth.

(3) Daily chemical industry (cosmetics, detergents)
● High viscosity medium control:

- Plunger valve/plug valve: used for quantitative filling of viscous materials such as shampoo and cream.

● Corrosive chemicals:

- Fluorine-lined valve: used for the transportation of raw materials containing strong acids/alkalis (such as hair dyes and detergents).

(4) Papermaking industry
● Pulp transportation:

- Wear-resistant ball valve/knife gate valve: handle fiber-containing pulp to prevent clogging.

● Chemical addition:

- Anti-corrosion regulating valve: Control the dosage of bleaching agent (such as chlorine, hydrogen peroxide).

(5) Textile printing and dyeing industry
● Dye and auxiliaries distribution:

- Metering valve: Accurately control the dye ratio to ensure color consistency.

● Wastewater treatment:

- Corrosion-resistant butterfly valve: Treat wastewater containing acid, alkali and dye.

2. Special requirements of the light industry
● Hygiene standards:

- Meet 3-A, EHEDG, FDA certification, surface roughness Ra≤0.8μm, to avoid microbial growth.

● Material safety:

- The part of the valve that contacts the medium must be non-toxic (such as 316L stainless steel, PTFE, EPDM).

● Easy-to-clean design:

- Use quick-release clamp connection (Tri-Clamp) to avoid thread dead corners.

● Precise control:

- Some processes require flow error <1% (such as pharmaceutical liquid preparation).

3. Typical cases
● Beer production line:

- Pneumatic butterfly valve controls wort delivery, sanitary ball valve is used for CO₂ injection.

● Vaccine production:

- Aseptic diaphragm valve is used in bioreactor to prevent contamination.

● Laundry detergent filling:

- Plunger valve quantitatively controls high viscosity liquid with an error of <0.5%.

Summary
The automatic control valves in the light industry are centered on hygiene, precision and safety, and pay more attention to material compliance and easy maintenance than heavy industry. With the improvement of automation, smart valves and green design will become the development trend.