Tianjin Cowote Foot Valve: The “Guardian of Safety” for Pump Equipment, Preventing Backflow to Prote

Tianjin Covot bottom valve: pump equipment"Safety Guard" to prevent backflow and protect core operations

In the operation system of pump equipment (such as water pumps, sewage pumps, chemical pumps), medium backflow is a common problem."Invisible killer" - sudden pressure drop when the pump is shut down, pipeline fluctuation or misoperation may cause the medium to be reversed, which will not only damage the impeller and shorten the life of the pump, but may also cause equipment jamming, leakage or even safety accidents. As the "first line of defense" at the inlet of pump equipment,Tianjin Covot bottom valveWith its precise anti-backflow design and reliable performance, it has become a core component to ensure the safe operation of pump equipment.

1. Why do pump equipment need a bottom valve? The fatal threat of backflow

The working principle of pump equipment relies on the unidirectional flow of the medium to drive the impeller to rotate, and the bottom valve serves as the pump inlet pipe.The core function of the "one-way switch" isPrevent the medium from flowing backward when the pump is stopped or not workingThe specific hazards are:

· Equipment damage: The backflow of medium will impact the pump impeller, causing blade breakage, bearing wear, and in severe cases, direct burning of the motor;

· Reduced efficiency: Repeated backflow will increase pipeline resistance and reduce the effective head and flow of the pump;

· Safety hazards: If the medium contains particles (such as sewage, mud), backflow may block the pump cavity, causing vibration, abnormal noise or even pipe burst.

Traditional bottom valves often fail due to problems such as loose sealing and slow opening and closing. However, Tianjin Covot bottom valves are designed for high-frequency use of pump equipment and have been fully upgraded from structural design to material selection to become the most popular bottom valve in pump systems."Safety Barrier".

2. Tianjin Covot bottom valve: anti-backflow solution optimized for pump equipment

As a professional pump valve manufacturer, Tianjin Covot has been deeply engaged in the field of pump accessories for many years. Its bottom valve products are deeply integrated with the operating characteristics of pump equipment and have four core advantages:

1. Structural design: precisely adapted to pump inlet working conditions
Covot bottom valve adoptsHeavy Hammer+Valve disc composite structure, the opening and closing are controlled by the linkage between the deadweight of the hammer and the pressure of the medium:

· Before starting: When the pump is not filled with medium, press down the hammer and close the valve disc to prevent air or impurities from entering the pump cavity;

· After starting: the medium flow generates an upward thrust, which overcomes the pressure of the hammer and opens the valve disc, and the pump works normally;

· After shutdown: the medium pressure disappears, the hammer returns to its original position, the valve disc closes tightly, and the backflow is completely blocked.

This design is a perfect match for pump equipmentThe "priming-starting-stopping" cycle operating condition avoids problems such as "cavitation" and "dry running" caused by backflow.

2. Material and sealing: corrosion resistance and wear resistance
In response to different media characteristics, Covotec bottom valves provide multiple materials to choose from:

· Stainless steel bottom valve(like304, 316L): Suitable for clean water and weakly corrosive media (such as drinking water and water for food processing). The surface is polished, the sealing surface hardness reaches HRC58-62, and it has strong resistance to particle wear;

· Copper alloy bottom valve(such as tin bronze): For highly corrosive media (such as seawater, chemical raw materials), copper alloys have natural corrosion resistance and good thermal conductivity, which can reduce seal failure caused by thermal expansion;

· UPVC bottom valve: Lightweight design (density is only 1/3 of steel)1/8), suitable for non-corrosive liquids (such as agricultural irrigation water), with excellent acid and alkali resistance.

At the same time, the valve disc and valve seat adoptDouble seal(Main seal+ auxiliary seal), even if it is exposed to high-pressure (PN16-PN100) or high-temperature (≤150℃) media for a long time, it can still maintain "zero leakage" and eliminate the risk of backflow.

3. Installation and adaptation: simplify maintenance and extend pump life
Covot bottom valve strictly follows the installation specifications of pump equipment inlet pipelines and provides"All-in-one" solution:

· Size matching:supplyThe full range of diameters from DN50 to DN200 is suitable for the inlet and outlet diameters of common centrifugal pumps and submersible pumps;

· Direction signs：Emphasis on valve body"Media flow direction" arrow to avoid backflow caused by installation errors;

· Anti-precipitation design: For medium containing particles such as sewage pumps, a filter screen can be added to the bottom of the valve chamber (optional) to prevent impurities from accumulating and affecting the seal;

· Maintenance-free structure: There are no moving parts (except the valve disc), so there is no need for frequent disassembly, which reduces maintenance costs and reduces failures caused by improper maintenance.

4. Performance Verification: Rigorous Testing for Reliability and Peace of Mind
Each batch of Covot bottom valves has passedStress Test (1.5 times the nominal pressure (maintain pressure for 30 minutes without leakage)、Sealing test (medium pressureLeakage rate ≤0.05L/h at 0.1MPa)、**Durability test (simulating 100,000 opening and closing cycles without deformation)** and more than 20 other tests are available. Some high-end models can also be customized with special working condition versions such as "temperature resistance -40°C ~ 200°C" and "pressure resistance PN100" to meet the needs of pump equipment in multiple fields such as chemical industry, electric power, and agriculture.

3. Application Scenario: Covering the Pump Safety Requirements of the Whole Industry

Tianjin Covot bottom valve has been widely used in the inlet pipelines of various pump equipment due to its strong adaptability and high reliability:

· Industrial pumps: In chemical circulation pumps and boiler feed pumps, prevent acid and alkali solutions from backflowing and corroding the pump body;

· Municipal pumps：Used for sewage lifting pumps and rainwater pumps to prevent debris in the pipe from flowing back and clogging the impeller;

· Agricultural pumps: Equipped with submersible pumps and irrigation pumps to ensure that no air enters during clean water transportation and improve pumping efficiency;

· Food and medicine pumps：Stainless steel bottom valve meetsGMP cleanliness requirements to prevent cross contamination of media.

Conclusion

The efficient and stable operation of pump equipment is inseparable from the precise protection of key components.With "backflow prevention" at its core, through structural optimization, material upgrades, and rigorous testing, it has become the "safety guardian" of pump equipment. Whether it's industrial production or livelihood security, choosing Covotel foot valves means choosing a deep commitment to equipment life and a solid guarantee of production safety.