Germany TOSS seals TOSS model TOSS price

TOSS 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 hydrodynamic seals. The shaft seal of a reciprocating pump is typically 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 consist of packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is typically 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 consist of packing seals, mechanical seals, and hydrodynamic seals.

TOSS seal classification

Seals can be divided into two major categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. Based on working pressure, static seals can be further divided into medium-to-low pressure static seals and high-pressure static seals. Medium-to-low pressure static seals commonly use softer, wider gasket seals, while high-pressure static seals use harder metal gaskets with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Additionally, depending on whether the seal contacts the components moving relative to it, they can be classified as contact seals and non-contact seals; based on the seal and contact location, they can be divided into circumferential seals and face seals, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic sealing achieve sealing by imparting kinetic energy to the medium during machine operation, hence they are sometimes referred to as hydrodynamic seals.

TOSS seal usage guidelines

1) Select appropriate seal materials and hydraulic oil, ensuring compatibility with operating temperatures and the oil. 2) High geometric positional accuracy (concentricity) of parts sliding relative to the seal, good material quality (such as hard chrome plating), and fine surface roughness can extend service life. (1) For oil seals used on hydraulic pump and motor shafts, the surface roughness of the sliding surface must be within 0.25m at Ra, and hard chrome plating is required on the surface. During actual use, the radial spring force of the oil seal lip should be appropriately adjusted according to specific conditions to ensure proper tightness. Additionally, an installation sleeve or thin shim must be used during installation to protect the seal ring, preventing the lip from rolling or twisting, which could cause the spring to slip out. (2) The inner surface of hydraulic cylinder barrels is commonly processed by roller burnishing, which not only improves surface roughness but also induces cold work hardening, helping to extend the service life of sealing rings. Furthermore, operating pressure, sliding surface length, and type significantly affect service life. Therefore, "scheduled inspection" intervals should be determined based on these conditions. (3) Ensure good lubrication of the sealing surfaces and prevent contaminant ingress. Using hydraulic oil that meets the specified cleanliness grade and employing correct installation methods are also essential requirements. Seal storage: 1). The recommended storage room temperature for seals is below 30℃ to avoid high-temperature aging; 2). Seals must be stored in sealed packaging to avoid contact with moisture or dust in the air; 3). Seals must be protected from strong light exposure to avoid erosion by ozone in the air or premature aging. The factors affecting performance vary for different types of seals; for example, factors affecting mechanical seals (such as packing seals) include temperature, medium, wear, and applied pressure.

TOSS seal precautions

1) Shaft speed: Due to design and structural reasons, high-speed shafts should use high-speed oil seals, and low-speed shafts should use low-speed oil seals. Low-speed oil seals must not be used on high-speed shafts, and vice versa. 2) Ambient temperature: In cases of higher operating temperatures, select polyacrylate, silicone, fluorine, or fluorosilicone rubber. Measures should be taken to lower the oil temperature in the tank. In cases of lower operating temperatures, select cold-resistant rubber. (3) Pressure: General oil seals have poor pressure resistance; excessive pressure will cause deformation. Under conditions of excessive pressure, pressure-resistant support rings or reinforced pressure-resistant oil seals should be used. 4) Installation eccentricity: If the eccentricity between the oil seal and the shaft is too large, sealing performance will deteriorate, especially at high shaft speeds. If eccentricity is excessive, oil seals with a "W" shaped cross-section can be used. 5) Shaft surface finish directly affects the service life of the oil seal; i.e., higher shaft surface finish results in longer oil seal service life. 6) Ensure there is a certain amount of lubricating oil at the oil seal lip. 7) Pay special attention to preventing dust from entering the oil seal.

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