German Double E seals, Double E models, Double E prices

Double E seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to 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 gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Others are classified as contact seals and non-contact seals based on whether the seal contacts the components moving relative to it; based on the seal and contact position, 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 energy to the medium during machine operation, hence they are sometimes referred to as power seals.

Double E seal classification

1) Packing seal: The packing seal has a simple structure, is inexpensive, and is easy to maintain. However, it has a high leakage rate and significant power loss. Therefore, packing seals are used for transporting 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) offer good sealing performance, very low leakage, and long service life, but they are expensive and have higher requirements for machining, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for transporting petroleum and chemical media and can be used for media with various viscosities, strong corrosiveness, and containing particles. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 3) Power seal: Power seals can be divided into two types: 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. Packing seals are commonly used in the shutdown sealing devices paired with back-vane (or auxiliary impeller) systems. Packing seals come in two types: standard and mechanically adjustable. 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 packing seals use counterweights to loosen the packing during pump operation and tighten it when stopped. Power seals are reliable, inexpensive, and easy to maintain, making them suitable for transporting media with many 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 a shorter service life for 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. Based on whether the sealing surfaces contact, it can be divided into contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device contacts the shaft, resulting in relative friction between the two. Contact dynamic seals include packing seals and mechanical seals.

Double E seal operation

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

Double E seal functions and applications

Engine: Crankshaft - front and rear crankshaft oil seals; Valve - valve oil seals (engine repair kit o rings) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft - camshaft oil seal; Transmission: Transmission - front and rear transmission oil seals; shift lever oil seal (transmission repair kit o rings) (transfer case - front and rear transfer case oil seals); Rear axle: Half-shaft - rear half-shaft oil seal; Differential - (front/rear) pinion oil seal; rear wheel oil seal; front wheel oil seal; steering gear oil seal (steering gear repair kit o rings); power steering oil seal (front half-shaft oil seal). Oil seals are required wherever a rotating housing contains liquid lubricating oil and connects to the exterior. Some are made of rubber, some of metal, but most are steel-cased rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half-shaft oil seals, front final drive oil seals, and compressor crankshaft oil seals.

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