German POWER-HYDRAULIK seals POWER-HYDRAULIK models POWER-HYDRAULIK prices

POWER-HYDRAULIK seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation that remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mechanical seals".

POWER-HYDRAULIK seal classification

1) Packing seal: The packing seal has a simple structure, low price, and is easy to maintain. However, it has high leakage and high 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 valuable, flammable, explosive, and toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) offer 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 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: Unless otherwise specified by the user, cartridge mechanical seals shall be installed. 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 stopped, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this time, the stop-seal device provides the sealing. Packing seals are commonly used in stop-seal devices paired with back-vane (or auxiliary impeller) seals. Packing seals come in two types: standard and mechanically adjustable. Standard packing seals are similar to those in general packing seal pumps, requiring 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. Dynamic seals are reliable, inexpensive, and easy to maintain, suitable for transporting media with many solid particles, such as slurry pumps and feed slurry pumps in the phosphate industry. The disadvantage is greater power loss compared to mechanical seals, and shorter service life of the stop-seal device. The seal between the rotating pump shaft and the stationary pump housing 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 dynamic seal. Depending on whether the sealing surfaces are in contact, it can be divided into contact dynamic seals and non-contact dynamic seals. Contact dynamic seals involve contact between the sealing device and the shaft, with relative friction between them. Contact dynamic seals include packing seals and mechanical seals.

POWER-HYDRAULIK 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 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 faces. 3) Check the sealing condition regularly. During operation, if leakage exceeds the standard (heavy oil not more than 5 drops/min, light oil not more than 10 drops/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

POWER-HYDRAULIK seal specifications and applications

1) Standard single-lip: Generally used for sealing mineral oil, water, and other media in high- and low-speed rotating shafts and reciprocating motion. Standard oil seals are used in environments with little dust and impurities, resistant to medium pressure< 0.05MPa, maximum linear speed 15m/s, reciprocating speed< 0.1m/s. 2) Standard double-lip: In addition to the usage characteristics of the above-mentioned S type oil seals, they also provide dust protection. Standard oil seals with a dust lip can prevent dust ingress, resistant to medium pressure< 0.05MPa, linear speed ≤ 15m/s. 3) Springless type: Springless single-lip inner-cage rubber oil seal. Generally suitable for low-speed conditions, sealing lubricating grease. Linear speed ≤ 6m/s. 4) Outer-cage single-lip: Single-lip outer-cage rubber oil seal with spring, thin waist, good followability, and good rigidity. Standard oil seals are used in environments with little dust and impurities, resistant to medium pressure< 0.05MPa. Rotational axis speed ≤ 15m/s. 5) Outer-cage double-lip: Double-lip outer-cage rubber oil seal with auxiliary lip, thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resistant to medium pressure< 0.05MPa. Speed ≤ 15m/s. 6) Assembled single-lip: Outer-cage oil seal assembled from inner and outer cages with rolled edges, featuring high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed, medium pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type (right-hand, left-hand): Angled ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to generate a unidirectional pumping action with a return flow effect. Related to the direction of shaft rotation, the radial force is smaller than that of standard oil seals due to the return flow effect, reducing wear and heat generation, and extending service life. Suitable for medium pressure< 0.05MPa, speed ≤ 20m/s. 8) Pressure-resistant type: Short lip, short and thick waist, providing pressure resistance, working pressure ≤ 3MPa. Suitable for medium pressure ≤ 3MPa, applicable as shaft end oil seals for high-pressure pumps. Generally, the PV value ≤ 8. Rotational axis speed ≤ 15m/s.

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