Stainless Steel Sanitary Thread Check Valve/Stainless Steel Valve

The core function of a sanitary check valve is to prevent fluid backflow, ensuring that the fluid in the pipeline system always flows in one direction, avoiding contamination, cross contamination, or equipment damage.Specific function decomposition:

1. Prevent backflow pollution

In hygiene industries such as food, pharmaceuticals, and beverages, if fluid (such as pharmaceuticals, dairy products, and purified water) flows back in pipelines, it may lead to bacterial growth or cross contamination of different batches of products.

The sealing design of the sanitary check valve (such as FDA certified silicone gasket) can completely block backflow and comply with hygiene standards such as GMP and 3A.

2. Protect equipment security

Pump protection: prevent water hammer effect (reverse pressure impact) from damaging the impeller or seal when the pump is stopped.

Filter/reactor isolation: prevent impurities or treated fluids from flowing back into upstream equipment.

3. Maintain stable system pressure

In constant pressure water supply or CIP (online cleaning) systems, check valves can prevent pressure fluctuations from causing backflow of cleaning solution or product, ensuring process stability.

4. Hygiene grade design features

No dead corners structure: The valve body is made of 316L stainless steel, with internal mirror polishing (Ra ≤ 0.8 μ m), no residue, easy to clean (supports SIP/CIP).

Quick disconnect connection: clamp or threaded design, can be quickly disassembled and sterilized, avoiding traditional valve gap contamination.

Typical application scenarios

Pharmaceutical: Prevent backflow of culture medium at the outlet of the fermentation tank.

Dairy products: UHT sterilization prevents reflux contamination.

Beer: The filling line avoids the impact of CO ₂ reflux on filling accuracy.

The core role of sanitary check valves in the food industry：

Raw material processing stage

Installing sanitary check valves on the outlet pipelines of storage tanks for raw milk, juice, syrup, etc. can prevent the material in the tank from flowing back into the conveying pump or front filter when the pump stops, avoiding the filter screen from being broken and impurities from returning to the tank, causing contamination of the entire tank.

Heating/Sterilization Section

• UHT、 A check valve must be installed at the outlet of the pasteurizer to ensure that sterilized products do not flow back to the unsterilized side; Once there is a pressure fluctuation, the valve will close in milliseconds to prevent "raw cooked crossover".

CIP/SIP cleaning sterilization cycle

When the cleaning agent, hot water, and pure steam are switched between multiple pipelines, the check valve ensures that the cleaning solution can only rush towards the equipment to be cleaned, and will not flow back into the production tank or filling machine, maintaining the hygiene boundary in the "production while cleaning" mode.

Filling and packaging end

Install check valves in the front section of the filling machine and capping machine to prevent residual liquid in the bottle or pipeline from being sucked back into the buffer tank during shutdown, and to prevent microorganisms from breeding in the tank with the reflux liquid, significantly reducing the microbial exceedance rate of the finished product (the exceedance rate of a dairy enterprise decreased by 90% after going online).

The core role of sanitary check valves in the pharmaceutical industry：

Aseptic boundary guard

Install sanitary check valves on the outlet pipelines of bioreactors, mixing tanks, and filling machines. The pump can be shut down immediately with zero leakage, blocking the backflow of sterilized liquid back into the upstream unsterilized area and avoiding the scrapping of the entire batch of products due to cross contamination.

Safety lock for pharmaceutical water system

Check valves in the purified water (PW) and injection water (WFI) circuits are listed as mandatory configurations to prevent backflow contamination by regulations such as EU GMP Annex 1 and FDA Guide; It can prevent low-grade water or residual liquid from flowing back to high-grade water points during pressure fluctuations in the pipeline network, ensuring that the water quality meets pharmacopoeia standards in real time.

Unidirectional flow control in biotechnology

During cell culture and fermentation processes, check valves only allow the flow of culture medium and buffer towards the direction of the bioreactor; Once the gas or liquid supply is interrupted, the valve will be immediately cut off to prevent the upstream sterile filter or culture medium storage tank from being contaminated by the backflow of cell fluid.

CIP/SIP process isolation

During the CIP/SIP cleaning and sterilization process, multiple production lines share the same cleaning station. Check valves ensure that high-temperature pure steam or acid-base cleaning agents can only flow to the current equipment being cleaned, and will not reverse into other pipelines being produced, achieving a compliant mode of "production and cleaning at the same time".