Chemical Pump Dynamic Sealing Rubber Ring

Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of chemical pump dynamic sealing rubber ring in China, also supports customized service. Please feel free to buy high quality chemical pump dynamic sealing rubber ring for sale here from our factory.

Chemical pump dynamic sealing rubber ring

Common shapes of dynamic sealing rubber rings for chemical pumps include O-shaped, V-shaped and lip-shaped. The O-ring has a simple structure and good sealing performance. It can provide reliable sealing effects under static and dynamic conditions. Its circular cross-section makes it easy to install and suitable for a variety of sealing grooves. The V-ring is composed of multiple sealing rings and can withstand greater pressure. It performs well under high-pressure conditions. Its unique V-shaped structure can effectively prevent the medium from leaking from the high-pressure side to the low-pressure side. It is usually used in the shaft seal of chemical pumps with extremely high sealing requirements. The lip ring has a lip design, which fits the sealing surface tightly. It has a significant one-way sealing effect on the medium, such as preventing the liquid in the chemical pump from leaking out. It is often used for the sealing of rotating shafts and can also work stably under conditions with a certain axial reciprocating motion.

• Hardness: Generally measured by Shore hardness, which varies for different materials and application scenarios. For example, the hardness of a sealing rubber ring made of fluororubber is usually between 70 and 85 Shore A, which can ensure good sealing fit and withstand certain mechanical pressure; the hardness range of nitrile rubber is wider, which can be 60 to 90 Shore A, and can be adjusted according to specific oil resistance and wear resistance requirements. A rubber ring with moderate hardness can better adapt to the rotation and reciprocating motion of the pump shaft, ensuring the durability of the seal.
• Tensile strength: measures the ability of a rubber ring to withstand tensile forces without breaking. For example, the tensile strength of fluororubber is usually between 10 and 20 MPa, and that of perfluoroether rubber is even higher, up to 15 to 25 MPa. This allows them to maintain structural integrity and effectively maintain sealing under external forces such as tensile deformation and vibration during pump operation. The tensile strength of nitrile rubber is generally 8 to 15 MPa, which meets the requirements for resisting mechanical stress under oil-containing conditions.
• Compression set: reflects the elastic recovery ability of the rubber ring under long-term compression. The compression set rate of high-quality chemical pump dynamic sealing rubber rings should be controlled at a low level under standard test conditions (such as under a certain pressure at a specific temperature and time). For example, the compression set rate of fluororubber is usually less than 30% under the test conditions of 200°C and 24 hours, which means that it can quickly recover to its original state after working for a long time under high temperature and high pressure conditions, maintain good sealing performance, and ensure the leakage-free operation of the chemical pump.

Q:In certain chemical media (such as high-concentration sulfuric acid, strong alkaline solution, etc.), which material of chemical pump dynamic seal rubber ring has the longest service life? What is the specific range of medium concentration that it can tolerate?

• High concentration sulfuric acid: It is recommended to use fluororubber (VITON) seals, which have excellent chemical corrosion resistance and can withstand high concentrations of sulfuric acid. The corrosion resistance of fluororubber gives it a long service life in high concentrations of sulfuric acid, but the specific tolerable medium concentration range needs to be determined based on the specific model and manufacturing process of the fluororubber, and the tolerable concentration range is usually around 90%.
• Strong alkali solution: For strong alkali solution, fluororubber is also a good choice, and its alkali resistance is good. In addition, polytetrafluoroethylene (PTFE) material also has good alkali resistance and is suitable for strong alkali solution environment.

Q:For chemical pumps operating under high temperature and high pressure (e.g. temperature 250°C, pressure 5MPa), what shape and material of sealing rubber rings are recommended to ensure that both sealing requirements are met and long-term stable operation is guaranteed?

• Shape selection: V-shaped or lip-shaped sealing rubber rings are recommended because they can provide better sealing effect and stability under high temperature and pressure.
• Material selection: Fluororubber (VITON) is an ideal choice, with excellent high temperature resistance and can be used for a long time at a high temperature of 250°C. At the same time, fluororubber also has good pressure resistance and can meet the pressure requirement of 5MPa.

Q:When a chemical pump is frequently started and stopped and has violent axial reciprocating motion, which rubber ring has the best elastic recovery and wear resistance to effectively prevent leakage?

• Elastic recovery performance: Natural rubber (NR) has excellent elastic recovery performance and can maintain good sealing effect during frequent starts and stops and severe axial reciprocating motion.
• Wear resistance: Polyurethane rubber (PU) has excellent wear resistance and can effectively prevent leakage during strenuous exercise.

Q:Will the dynamic sealing rubber rings of chemical pumps made of different materials undergo chemical property changes after long-term contact with different chemical substances, thereby affecting the sealing performance? How to monitor and prevent it?

• Changes in chemical properties: Dynamic sealing rubber rings of chemical pumps made of different materials may undergo changes in chemical properties, such as swelling, hardening, degradation, etc., after long-term contact with different chemical substances, thus affecting the sealing performance.
• Monitoring and prevention
• Regular inspection: Regularly inspect the appearance of the sealing rubber ring to see if there is any deformation, cracks, aging, etc.
• Media compatibility test: Perform a media compatibility test on the sealing rubber ring before use to ensure that it matches the chemical properties of the conveying medium.
• Replacement cycle: According to the usage of the sealing rubber ring and the characteristics of the medium, set a reasonable replacement cycle and replace the aging or damaged sealing ring in time.

Q:When installing the dynamic sealing rubber ring of a chemical pump, are there any specific installation techniques and precautions for different shapes such as O-shaped, V-shaped, and lip-shaped to avoid seal failure due to improper installation?

• O-ring: When installing, make sure that the surface of the O-ring is free of damage and impurities. Use special tools to place the O-ring smoothly into the sealing groove to avoid excessive stretching or twisting.
• V-ring: When installing the V-ring, pay attention to the opening direction of the V-ring. Generally, the opening should be facing the side with lower pressure. At the same time, ensure that the lip of the V-ring fits tightly with the sealing surface to avoid missing or wrong installation.
• Lip ring: When installing the lip ring, make sure the lip is in the correct direction, with the lip facing the source of pressure. Be gentle during installation to avoid damaging the lip.
• It is known that the temperature fluctuation of the medium conveyed by chemical pumps is large (such as -20℃ to 180℃). How to choose the appropriate rubber ring material according to the temperature changes, and how to ensure the sealing stability of the rubber ring during frequent temperature changes?
• Material selection: Silicone rubber (SIL) has excellent heat and cold resistance and can maintain good sealing performance in the temperature range of -20℃ to 180℃.
• Stability guarantee
• Choose the right rubber ring: According to the temperature fluctuation range, choose a rubber ring material with good temperature resistance, such as silicone rubber.
• Leave a margin during installation: When installing the rubber ring, take into account the thermal expansion or contraction caused by temperature changes and leave a certain margin to adapt to temperature changes.
• Regular inspection and adjustment: Under working conditions with large temperature fluctuations, the sealing condition of the rubber ring should be checked regularly and adjusted or replaced in time to ensure sealing stability.

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