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parker seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common types of shaft seals include packing seals, mechanical seals, and hydrodynamic 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 include packing seals, mechanical seals, and hydrodynamic 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 include packing seals, mechanical seals, and hydrodynamic seals.

parker seal operating principle

An oil film controlled by the lip of the oil seal exists between the oil seal and the shaft; 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 interface with air, preventing 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 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, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the skeleton oil seal must be kept perpendicular to the shaft axis. If not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep from the housing to maintain an oil film on the sealing surface.

parker 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 in rotary and reciprocating motion. They are installed on heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their main function is to prevent the sealed medium (gas or liquid) from penetrating and to keep external contaminants out of the unit. Precautions: Standard oil seals have a very limited pressure range, generally 0.03 MPa. This pressure is typically generated by the height difference of the lubricating oil itself. If higher pressures need to be sealed, high-pressure oil seals (generally capable of withstanding up to 1 MPa) or other sealing forms should be selected.

parker seal installation technical requirements

Mechanical seals are high-precision mechanical components, and correct installation and operation significantly affect their service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for the pump and the mating parts of 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, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, it 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; (common practice: face runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline: 0.05 mm; perpendicularity tolerance of the surface contacting the gasket relative to the centerline: 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 seal is installed, and the ends of the gland (or housing) where the static ring seal is installed, should be chamfered and smoothed. 7) Exercise care when installing or removing mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging sealing elements. If deposits prevent 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 has caused seal displacement, the stationary and rotating ring components must be replaced and must not be merely retightened for continued use. This is because loosening alters the original running track of the friction pair, easily compromising the sealing integrity of the contact surfaces.

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