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GLASER seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices designed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal for reciprocating pumps is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

GLASER seal principle

An oil film controlled by the lip of the oil seal exists between the oil seal and the shaft, and this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the end where it contacts the air, preventing the leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft centerline. If it is not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the state of forming an oil film at the sealing surface.

GLASER seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing rotating and reciprocating motions. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their main function is to prevent the penetration of sealed media (gas, liquid) and the entry of external foreign objects into the body. Precautions: Ordinary oil seals have a very limited pressure-bearing range, generally 0.03 MPa. This pressure is usually formed by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

GLASER seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation have a significant impact on their service life. We generally follow the standards prescribed 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 sealing ring, not greater than 0.06 mm; 3) Axial shaft movement is not allowed to exceed ±0.5 mm; if a shaft sleeve is present, the shaft sleeve must not be loose; 4) Coupling alignment error: for gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (customary practice: face runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing mating spigot relative to the shaft centerline is 0.05 mm, and the perpendicularity tolerance of the plane contacting the gasket relative to the centerline is 0.03–0.05 mm. If these requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring sealing ring is installed, and the ends of the gland (or housing) where the static ring sealing ring is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging the sealing elements. If scaling prevents removal, clean thoroughly before attempting removal again. 8) If mechanical seals are used on both ends of the pump, take care during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if the gland becomes loose causing the seal to shift, the dynamic and static ring parts must be replaced and should not be retightened for continued use. This is because the original operating trajectory of the friction pair will change after loosening, and the sealing integrity of the contact surface is easily compromised.

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