German draftex seals draftex models draftex prices

draftex seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After inspection and pressure testing, the unit is mounted on the shaft within the stuffing box, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates with parallel faces and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering the aforementioned advantages. Cassette seals are also a type of cartridge mechanical seal. In this seal, the static ring, dynamic ring, shaft sleeve, gland, and auxiliary seals are all assembled together with a shaft sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

draftex seal principles

An oil film controlled by the oil seal lip 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 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 out from the housing to maintain an oil film at the sealing surface.

draftex seal applications

Skeleton oil seals are widely used in aviation, automotive, motorcycle, railway, vehicle, ship, home appliance, and construction machinery industries. They are suitable for sealing rotating and reciprocating motions. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Primarily prevents penetration of the sealed medium (gas, liquid) and entry of external foreign matter into the body. 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 pressure sealing is required, select high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or choose other sealing forms.

draftex seal precautions

1) Before designing grooves, please carefully read the product descriptions for each series to distinguish whether the product uses an integral groove or a split groove; during the seal installation process, avoid sharp edges; bore seals installed into integral grooves must use installation tools; designers must consider parameters such as groove dimensional accuracy, surface roughness, and extrusion gap; for details, refer to the product instructions, diagrams, and dimension tables. 2) Before installing seals, ensure there are no impurities or cracks in the sealing groove; apply operating oil to both the sealing groove and the seal surface; install the seals gradually in sequence; avoid sharp edges during installation, align the seal properly, and avoid twisting and skewing; if it is a split groove, finally tighten the gland.

Weidou Intelligent Technology specializes in selling German draftex seals, draftex sealing rings, draftex sealing strips, draftex pipe seals, draftex cable seals, draftex rubber seals, draftex mechanical seals, draftex gaskets, draftex oil seals, draftex shaft seals, draftex metal seals, draftex high-pressure seals, draftex spiral seals, draftex centrifugal seals, draftex sealing rings, draftex original German imports. Welcome customers to inquire and order.