Sanitary diaphragm valve is a fluid control equipment designed specifically for high hygiene standard industries, widely used in fields such as food, beverage, pharmaceutical, biotechnology, etc. that require strict cleanliness and sterility. Here is a detailed introduction:
1. Structural characteristics
diaphragm designUsing elastic diaphragms (such as EPDM, PTFE, silicone, etc.) as sealing elements to isolate the interior of the valve body from the actuator, avoiding medium contact with the valve stem or cavity, and eliminating pollution and dead corners.
valve body structureThe inner wall of the valve body is smooth, the flow channel is unobstructed, and it meets hygiene standards such as 3A, SMS, DIN, etc. It is easy to clean and sterilize (such as CIP/SIP).
Material SelectionThe valve body is usually made of 316L stainless steel (electrolytic polishing), and the diaphragm material needs to be corrosion-resistant and heat-resistant, meeting FDA, EU 1935/2004 and other certifications.
2. Working principle
Operation methodBy using pneumatic, manual, or electric actuators to push the diaphragm up and down, the flow channel is closed when the diaphragm is pressed down and opened when lifted. No need for filling and sealing throughout the process to avoid the risk of leakage.
Zero leakage: DiaphragmdiaphragmCut off the medium, suitable for high-purity or hazardous fluids.
3. Core advantages
HygieneEasy to disassemble, meeting GMP, EHEDG and other standards.
corrosion resistanceSuitable for acids, bases, organic solvents, and high viscosity fluids.
Easy to maintainThe diaphragm membrane is a worn part, which can be replaced quickly without the need for professional tools.
4. Typical application scenarios
food industryTransportation of fluids such as milk, juice, sauce, etc.
pharmaceutical industryAseptic process, purified water system, CIP circuit.
biotechnologyControl of sensitive media such as culture media and vaccines.
5. Selection precautions
size：DN15-DN150（1/2'-6'）， Choose based on traffic demand.
Pressure/temperature rangeUsually ≤ 10 bar, the temperature depends on the diaphragm material (such as PTFE, which can withstand temperatures above 150 ℃).
Certification requirementsNeed to confirm compliance with specific standards such as FDA, 3A, ATEX (explosion-proof), etc.
6. Maintenance and Cleaning
Regularly check for aging or damage to the diaphragm.
After disassembly, it needs to be cleaned to ensure no residue, and if necessary, high-temperature sterilization should be carried out.
Sanitary diaphragm valves, with their sealing and easy cleaning properties, have become a key component of sanitary fluid systems, especially irreplaceable in preventing cross contamination and ensuring product safety.