German HAUSER seals HAUSER models HAUSER prices

HAUSER seals are sealing devices designed to prevent leakage between the pump shaft and the housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting 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 consist of packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting 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 consist of packing seals, mechanical seals, and power seals.

HAUSER seal classification

Oil seals are generally divided into single-piece types and assembled types. Assembled types allow free combination of the skeleton and lip material, and are 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, rotating 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 with a self-tightening spring fully covered by rubber. The term oil seal commonly refers to this type of tc skeleton oil seal.

HAUSER seal materials

Common materials for oil seals include: nitrile rubber, fluororubber, 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 to 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 range of -30 to 150 degrees Celsius. 3) Fluororubber: It offers aging resistance, heat resistance, 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. However, its cold resistance and high-temperature wear resistance are poor, and it has significant permanent compression deformation. It is suitable for temperatures from -20 to 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 to 260 degrees Celsius. 5) Polytetrafluoroethylene: It has outstanding chemical stability, thermal stability, friction reduction, and self-lubrication. Its decomposition temperature is above 400 degrees Celsius. Therefore, it can work normally in the temperature range of -200 to 300 degrees Celsius. Except for free fluorine and alkali metals, it has excellent corrosion resistance to chemicals, solvents, hydroxides, and acids. Nitrile rubber and fluororubber 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 material's compatibility with the working medium, adaptability to the working temperature range, and the lip's ability to follow the rotating shaft during high-speed rotation. Generally, when an oil seal is in operation, the temperature of its lip is 20 to 50℃ higher than the working medium temperature, which should be noted when selecting materials. The working range of an oil seal depends on the material used: for nitrile rubber (NBR), it is -40 to 120℃; for acrylic rubber (ACM), it is -30 to 180℃; for fluororubber (FPM), it is -25 to 300℃.

HAUSER seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact their service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the parts mating with the mechanical seal are as follows: 1) Shaft bending: maximum not greater than 0.05 mm; 2) Rotor runout: near the shaft sleeve at the dynamic ring seal location, not greater than 0.06 mm; 3) Axial shaft movement is not allowed to exceed ±0.5 mm. If a shaft sleeve is present, loosening of the shaft sleeve is not permitted; 4) Coupling alignment error: for gear couplings, not greater than 0.08 to 0.10 mm (P2008C); for elastic couplings, not greater than 0.05 to 0.06 mm; (conventional practice for face runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm. The perpendicularity tolerance of the surface contacting the gasket relative to the centerline is 0.03 to 0.05 mm. If these requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring seal is installed, and the ends of the gland (or housing) where the static ring seal is installed, should be chamfered and smoothed. 7) Be careful during the installation and removal of mechanical seals. The use of hammers and flat chisels is strictly prohibited to avoid damaging seal components. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the dynamic and static ring components must be replaced. Do not simply re-tighten and continue use. Because after loosening, the original operating trajectory of the friction pair changes, and the sealing integrity of the contact surface is easily compromised.

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