German RX seals RX model RX price

RX seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When conveying media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When conveying media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals.

RX 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 classified into various forms with different names. However, conventionally, rotating shaft lip seals are referred to as oil seals, while sealing elements 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 with a self-tightening spring fully encapsulated in rubber. The term oil seal commonly refers to this type of tc caged oil seal.

RX seal materials

Common materials for oil seals include: nitrile rubber, fluorocarbon rubber, silicone rubber, acrylic 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): It has 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) Fluorocarbon rubber: It offers aging, heat, and oil resistance, and is suitable for almost all lubricating oils, fuel oils, and gasoline. It does not harden easily in oils containing extreme pressure additives, but 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: It has outstanding high and low-temperature resistance. It can be used super 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 within the working temperature range of -70~260. 5) Polytetrafluoroethylene: It has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400. Therefore, it can work 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 fluorocarbon rubber are widely used oil seal materials. The former is low-cost, but the latter offers significant improvements in temperature resistance and sealing performance, though at a higher cost. It still retains some common disadvantages of ordinary rubber materials, such as poor wear resistance, short service life, and high sensitivity to shaft eccentricity, so leakage phenomena remain relatively common. PTFE oil seals are high-tech products and represent the future direction of oil seal development [2]. When selecting oil seal materials, one must consider the compatibility of the material with the working medium, adaptability to the working temperature range, and the ability of the lip edge to follow the high-speed rotation of the shaft. Generally, the temperature of the lip edge during operation is 20~50℃ higher than the working medium temperature, which should be noted when selecting oil seal materials. The operating range of an oil seal depends on the material used: for nitrile rubber (NBR), it is -40~120℃; for acrylic rubber (ACM), it is -30~180℃; for fluorocarbon rubber (FPM), it is -25~300℃.

RX seal installation precautions

1) During installation, pay close attention to avoid installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. Check each point with a feeler gauge; the error should not exceed 0.05 mm. Check the fit clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve. It should be uniform around the circumference. Check each point with a feeler gauge; the allowable error should not exceed 0.01 mm. 2) The spring compression amount must be performed according to regulations. Excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve a seal. 3) After installing the rotating ring, press it against the spring; it should automatically spring back. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, check for abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve, flanges, and other components that contact the packing and sealing rings (O rings). If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than needed to the site. This way, if there are leftover parts after installation, it indicates a missed installation step; if parts are insufficient, it means parts were assembled in unnecessary places, thus serving as a self-check during installation.

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