German seppelfricke seals seppelfricke models seppelfricke prices

seppelfricke seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. Commonly referred to oil seals often refer to this type of tc skeleton oil seal.

seppelfricke seal classification

1) Packing seal: The packing seal features a simple structure, low cost, and easy maintenance. However, it has high leakage volume and significant power loss. Therefore, packing seals are used for conveying general media, such as water; they are generally not suitable for petroleum and chemical media, especially for valuable, flammable, explosive, or toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) provide good sealing performance, very low leakage, and long service life, but are expensive and have higher requirements for machining, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for conveying petroleum and chemical media and can be used for media with various viscosities, strong corrosiveness, and solid particles. The American Petroleum Institute standard API610 (8 edition) stipulates that cartridge mechanical seals shall be equipped unless otherwise specified by the user. 3) Dynamic seal: Dynamic seals can be divided into back-vane seals and auxiliary impeller seals. During pump operation, the centrifugal force of the back vanes (or auxiliary impeller) reduces the medium pressure at the shaft seal to atmospheric or negative pressure, preventing leakage during use. When the pump stops, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this time, the shutdown sealing device provides the sealing function. Packing seals are commonly used in the shutdown sealing devices matched with back-vane (or auxiliary impeller) seals. There are two types of packing seals: standard type and mechanically adjustable tension type. Standard packing seals are similar to those in general packing seal pumps, requiring a slight positive pressure at the shaft seal to avoid dry friction of the packing. Mechanically adjustable tension packing seals use counterweights to loosen the packing during pump operation and tighten it when the pump stops. Dynamic seals offer reliable performance, low cost, and easy maintenance, making them suitable for conveying media with a high content of solid particles, such as slurry pumps and feed slurry pumps in the phosphate industry. The disadvantages are greater power loss compared to mechanical seals and shorter service life of the shutdown sealing device. The seal between the rotating pump shaft and the stationary pump casing is called the shaft seal. Its function is to prevent high-pressure liquid from leaking out along the shaft or outside air from entering along the shaft. For centrifugal pumps, the shaft seal is a type of dynamic seal. Depending on whether the sealing surfaces are in contact, dynamic seals can be classified as contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device is in contact with the shaft, resulting in relative friction between the two. Contact dynamic seals include packing seals and mechanical seals.

seppelfricke seal operation

1) If slight leakage occurs after the pump starts, observe for a period of time. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. 2) The operating pressure of the pump should be stable, with pressure fluctuations not exceeding 1 kg/cm². 3) During pump operation, avoid cavitation to prevent dry friction of the sealing surfaces and seal damage. 3) Check the sealing condition frequently. During operation, if leakage exceeds the standard, heavy oil shall not exceed 5 drops/min, and light oil shall not exceed 10 drops/min. If there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

seppelfricke 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 prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal 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 moving ring seal ring, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if equipped with a shaft sleeve, 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 spigot relative to the shaft centerline is 0.05 mm, and the perpendicularity tolerance of the surface 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 moving ring seal ring is installed, and the ends of the gland (or housing) where the static ring seal ring is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals; strictly prohibit using hammers and flat chisels to avoid damaging seal components. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used at both ends of the pump, take care during assembly and disassembly to avoid neglecting one end while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the stationary and rotating ring components must be replaced and should not be retightened for continued use. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surfaces.

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