German RVT seals RVT models RVT prices

RVT seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or fixing screws.

RVT seal classification

Oil seals are generally divided into single-piece types and assembled types. The assembled type allows free combination of the cage and lip material, and is generally used for special oil seals. Based on sealing function, characteristics, structural type, operating state, and sealing mechanism, oil seals can be categorized into various forms with different names. However, conventionally, rotary shaft lip seals are referred to as oil seals, while sealing elements used for static seals and dynamic seals (generally reciprocating motion) are called seals. The representative form of an oil seal is the TC oil seal, which is a double-lip oil seal fully encapsulated in rubber with a self-tightening spring. The term oil seal commonly refers to this type of tc caged oil seal.

RVT seal materials

Common materials for oil seals include: Nitrile rubber, Fluoroelastomer, Silicone rubber, Acrylate rubber, Polyurethane, Polytetrafluoroethylene, etc. 1) Nitrile rubber (NBR): It has good heat and wear resistance, and is resistant to various lubricating oils, greases, and oil-gas mixtures. The applicable temperature range is -30~120 degrees Celsius. However, it cannot be used in phosphate ester hydraulic fluids or gear oils containing extreme pressure additives. It performs stably in gasoline and mineral oils with low aniline points. 2) Polyacrylate rubber (ACM): Superior oil and heat resistance, wear resistance, ozone resistance, and UV radiation resistance. It is especially resistant to lubricating oils, gear oils, motor oils, engine oils, and petroleum-based hydraulic fluids containing extreme pressure agents. It is suitable for operation in the -30~150 degrees Celsius range. 3) Fluoroelastomer: Resistant to aging, heat, and oil. It is suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives. However, it has poor cold resistance and high-temperature wear resistance, and significant permanent compression set. It is suitable for temperatures from -20~250 degrees Celsius. 4) Silicone rubber: Has outstanding high and low-temperature resistance. It can be used long-term at 150 degrees Celsius without performance change; it can be used continuously at 200 for 10000h. It maintains its unique elasticity, ozone resistance, and weather resistance in the working temperature range of -70~260. 5) Polytetrafluoroethylene: Has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can operate normally in the temperature range of -200~300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluoroelastomer are widely used oil seal materials. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing, though at a higher cost. It still retains some negative commonalities of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena are still relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the high-speed rotation of the shaft must be considered. Generally, the lip temperature of an oil seal during operation is 20~50℃ higher than the working medium temperature, which should be noted when selecting materials. The operating range of an oil seal depends on the material: Nitrile rubber (NBR) is -40~120℃, Acrylate rubber (ACM) is -30~180℃, and Fluoroelastomer (FPM) is -25~300℃.

RVT seal precautions

1) Obtain a fixed quantity of oil seals. 2) From receipt to assembly, oil seals must be kept clean. 3) Before assembly, inspect the oil seals. Measure all dimensions of the caged oil seal to ensure they match the shaft and housing dimensions. Before installing the caged oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal; they must match. The internal dimensions of the housing must suit the outer diameter width of the oil seal. Check the lip of the caged oil seal for damage or deformation, and check the spring for detachment or rust. Prevent the oil seal from being stored flat during transport, subjected to external squeezing and impact, which could destroy its roundness. 4) Perform machining inspection procedures before assembly. Measure whether the dimensions of the housing and shaft are correct, especially the internal chamfer, which must not have a slope. The end face machining of the shaft and housing must be smooth. Chamfers must be free of damage and burrs. Clean the assembly area. There must be no burrs, sand, iron filings, or other debris at the shaft insertion point (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer. 5) Regarding operational technique, use your hand to feel if the surface is smooth and truly round. 6) Do not tear open the packaging paper of the caged oil seal too early before installation, to prevent debris from adhering to the seal surface and entering the system. 7) Before machine installation, apply an appropriate amount of lithium-based grease with molybdenum disulfide between the lips of the caged oil seal. This prevents dry grinding of the lip during instantaneous shaft startup, which affects the lip interference fit. Assemble as soon as possible. If the oil seal housing with the installed seal is not immediately mounted, cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium grease must be clean. 8) Caged oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be excessive, and speed should be uniform and slow. 9) Mark the machine where this caged oil seal is installed for tracking purposes. Pay close attention to the entire process.

Weidou Intelligent Technology professionally sells German RVT seals, RVT O-rings, RVT sealing strips, RVT pipe seals, RVT cable seals, RVT rubber seals, RVT mechanical seals, RVT gaskets, RVT oil seals, RVT shaft seals, RVT metal seals, RVT high-pressure seals, RVT spiral seals, RVT centrifugal seals, RVT sealing rings, RVT original German imports. Welcome inquiries and orders from users.