What is a food-grade screw pump?

food grade screw pump, hygienic screw pump

Food-grade screw pump is a positive displacement pump specially used in the food industry. Its main feature is to maintain the hygiene, safety and quality of products when transporting food and beverages. It has good hygienic performance, reliability and corrosion resistance. It is suitable for processing food materials with high viscosity, perishable and easy to agglomerate.


1. Working principle of food-grade screw pump

The food-grade screw pump adopts a twin-screw or triple-screw structure, and the liquid is delivered by the rotation of the screw in the pump body. Its special design makes there is no metal contact in the pump body, which avoids the contamination of food by the internal parts of the pump. At the same time, the food-grade screw pump also has a large pumping capacity and relatively stable flow characteristics to ensure that the food will not be damaged or deteriorated during the transportation process.


2. Application field of food-grade screw pump


(1) Food processing


Food-grade screw pumps are widely used in food processing, such as conveying liquid food materials such as milk, juice, sauces, oils, and syrups. Its high-efficiency and hygienic features make it an indispensable part of the food processing production line.


(2) Beverage Production


In the beverage industry, food-grade screw pumps are used to transport carbonated beverages, juice beverages, tea beverages, etc. It is able to handle liquids containing air bubbles or particles, ensuring that beverages retain their taste and quality during the filling process.


(3) Candy and chocolate manufacturing


Food-grade screw pumps are used to convey raw materials such as syrup and chocolate paste to ensure uniform mixing of products and production efficiency.


(4) Bread and pastry production


In the bakery industry, food-grade screw pumps are used to convey batter, cream and other materials to ensure product quality and production efficiency.


3. Advantages of food-grade screw pump


(1) Sanitation and safety


The food-grade screw pump is made of high-quality stainless steel or special food-grade materials to ensure that the surface of the pump body is smooth and easy to clean and prevents the growth of bacteria, thereby ensuring food hygiene and safety.


(2) Stable and reliable


The screw pump adopts a twin-screw or three-screw structure, which runs smoothly without shock and vibration, reduces the shearing and extrusion of food during transportation, and maintains the original characteristics of food.


(3) High efficiency and energy saving


Food-grade screw pumps have high pumping efficiency and low energy consumption, which helps to reduce production costs and save energy.


(4) Strong adaptability


Food-grade screw pumps can handle food products with different temperatures, viscosities and particles, with strong adaptability and flexibility.

4. Material of the pump

The material requirements of the food-grade screw pump meet the hygiene standards of the food industry. The materials of its main components include stainless steel, PTFE, silica gel, fluoro rubber, etc., which have the advantages of corrosion resistance, high-temperature resistance and low-temperature resistance. At the same time, the surface of the pump body and impeller is required to be smooth, seamless and easy to clean, so as to prevent food residue and bacterial growth.

In addition, the food-grade screw pump also requires a sealed structure to ensure that the fluid in the pump will not leak out. Commonly used sealing methods include mechanical seals, packing seals, etc. At the same time, the structure of the pump also needs to be reasonably designed to facilitate disassembly, cleaning and maintenance, so as to ensure that the pump is always hygienic, safe and of high quality.


5. Selection of Food Hygienic screw Pump


(1) Material selection


The key components of the food hygiene grade screw pump should be made of materials that meet food safety standards, such as stainless steel 316L, food-grade rubber, etc. These materials are resistant to corrosion and contamination of food materials, ensuring the hygienic safety of products.


(2) Design structure


The design and structure of the screw pump should meet hygienic standards and be easy to clean and maintain. Pay attention to the internal structure of the pump to ensure that there are no dead spots, crevices or pooling areas to prevent food residue and bacteria growth.


(3) Sealing method

Choose a screw pump with good sealing performance to prevent leakage and cross-contamination. Common sealing methods include mechanical seals and packing seals, and the appropriate type can be selected according to specific needs.


(4) Cleaning and sterilization capabilities


Food hygiene grade screw pumps should have good cleaning and sterilization capabilities to ensure that contamination and bacteria can be effectively removed during production to prevent cross-contamination and food safety issues.


(5) Flow and pressure requirements


Accurately determine the required flow and pressure range according to the requirements of the production process. Select the appropriate screw pump model to ensure that it can meet the flow and pressure requirements in the production process.


(6) Reliability and maintainability


the key to choosing a quality screw pump with good reliability and easy maintenance. Consider the pump’s manufacturer’s reputation and product quality for after-sales service and repair support. Choosing a high-reliability screw pump can reduce downtime and maintenance costs, and improve production efficiency and stability.


(7) Compatibility and adaptability


Consider the compatibility and adaptability of the screw pump with other production equipment to ensure that it can be seamlessly integrated into the production line. This includes matching with pipeline connection methods, control system interfaces, etc.


(8) Certification and Conformity


Make sure that the selected food hygiene progressive cavity pump complies with relevant industry standards and regulatory requirements. For example, according to the requirements of the FDA (US Food and Drug Administration), choose a pump that meets food-grade certification, such as 3A certification, etc.


(9) Economy


In addition to considering the price of the product itself, it is also necessary to comprehensively consider the operating cost and life of the pump. Choosing a progressive cavity pump with an efficient energy consumption ratio can reduce energy consumption and operating costs.


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