German NELSON seals, NELSON models, NELSON prices

NELSON seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a 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 sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

NELSON seal features

1) No need to measure the seal working length during installation; 2) The shaft can be adjusted at any time; 3) No leakage occurs during startup because the seals are pre-tested; 4) Installation only requires tightening the seal cover bolts, ensuring easy assembly quality control; 5) Protects sealing surfaces from contamination by debris or damage due to operational errors before installation or startup; 6) Can be readjusted after thermal expansion of the machinery; 7) Self-centering through fit; 8) Seals can be easily removed for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends cartridge mechanical seals for all mechanical seals.

NELSON seal startup preparation

1) Thoroughly inspect the mechanical seal, as well as the completeness of auxiliary devices and pipeline installations, to ensure they meet technical requirements. 2) Perform a static pressure test on the mechanical seal before startup to check for leakage. If significant leakage is observed, identify the cause and eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The static test pressure is generally 2~3 kg/cm². 3) Rotate the pump according to its direction of rotation to check for smooth and uniform movement. If rotation is difficult or stuck, check for incorrect assembly dimensions or improper installation.

NELSON seal specifications and applications

1) Standard single-lip: Generally used for sealing mineral oil, water, and other media on high- and low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with little dust and impurities, resisting 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 S type oil seals, they also provide dust protection. Standard oil seals with a dust lip can prevent dust ingress, resisting medium pressure<0.05MPa, linear speed ≤ 15m/s. 3) Springless type: Single-lip inner-cage rubber oil seal without a spring. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer-cage single-lip: Single-lip outer-exposed cage rubber oil seal with a spring. It has a thin waist, good follow-up, and good rigidity. Standard oil seals are used in environments with little dust and impurities, resisting medium pressure<0.05MPa. For rotational axis speeds ≤ 15m/s. 5) Outer-cage double-lip: Double-lip outer-exposed cage rubber oil seal with a secondary lip. It has a thin waist, good follow-up, high rigidity, and good coaxiality. Standard oil seals with a dust lip can prevent dust ingress, resisting medium pressure<0.05MPa. Rotational speed ≤ 15m/s. 6) Assembled single-lip: Outer-cage oil seal formed by assembling inner and outer cages with rolled edges. It features 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. Using hydrodynamic principles, it generates a unidirectional pumping action with a return flow effect. Related to the shaft's direction of rotation, the return flow effect results in lower radial force than standard oil seals, reducing wear and heat generation, and extending service life. Suitable for medium pressure<0.05MPa, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance. Working pressure ≤ 3MPa. Suitable for applications with medium pressure ≤ 3MPa. Suitable for shaft end oil seals on high-pressure pumps. Generally, the PV value ≤ 8. Rotational axis speed ≤ 15m/s.

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