German Norelem seals Norelem models Norelem prices

Norelem seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices designed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

Function of Norelem seals

Prevent high-pressure liquid from leaking out of the pump and prevent air from entering the pump. Although the shaft seal occupies a small space in the pump, the normal operation of the pump is closely related to the shaft seal. If the shaft seal is improperly selected, it will not only require frequent maintenance during operation and cause significant loss of the transported liquid, but may also cause fires, explosions, and poisoning accidents due to the leakage of flammable, explosive, and toxic liquids, with unimaginable consequences. Therefore, the shaft seal structure must be reasonably selected to ensure the safe operation of the pump. 1) Since the pressure inside the cylinder is not equal to the external atmospheric pressure, steam inside the cylinder or air outside the cylinder will inevitably leak out or in through the radial gap between the main shaft and the cylinder, causing working fluid loss, deteriorating the operating environment, and heating the shaft journal or allowing steam to enter the bearing chamber, causing oil quality deterioration. Leaking air also breaks the vacuum, thereby increasing the exhaust load, which will reduce the unit efficiency. For this reason, shaft seals are installed at both ends of the cylinder where the rotor passes through. This type of shaft seal is called an end shaft seal, abbreviated as shaft seal. High-pressure shaft seals are used to prevent steam from leaking out of the cylinder, and low-pressure shaft seals are used to prevent air from leaking into the cylinder. 2) During turbine operation, a portion of the steam will inevitably leak from the shaft end to the atmosphere, causing loss of working fluid and heat, and also affecting the working environment of the turbogenerator. If the adjustment is improper and the steam leakage is excessive, it will also cause the temperature of the bearings near the shaft seal to rise or cause water to enter the bearing oil. For this reason, shaft seal heaters are installed in various units to recover and utilize the shaft seal steam leakage from the turbine. 3) Prevent steam inside the cylinder and valve stem leakage from leaking outward, polluting the turbine room environment and bearing lubricating oil quality. Prevent high-temperature steam from flowing over the turbine main shaft during normal unit operation, causing it to heat up and thus causing bearing overheating. Prevent air from leaking into the vacuum part of the cylinder. Ensure the vacuum effect and degree of the condenser during unit startup. Recover shaft seal and valve stem leakage to reduce working fluid and energy losses. 4) During the turbine trip shutdown and the entire hot shutdown process where the condenser needs to maintain a vacuum, prevent air from leaking into the turbine, accelerating internal cooling of the turbine and causing main shaft bending.

Norelem seal replacement steps

1) Remove the main pulley (belt drive) and remove the key pin; 2) Use a pin puller to remove the locating pins of the shaft seal end cover; 3) Remove the fixing screws of the shaft seal end cover; 4) Use a circular external puller to remove the shaft sleeve (if no puller is available, cut a groove on the shaft sleeve with a cutting machine and knock it down with a chisel; note to block sand with something to prevent it from getting into the screw rod); 5) Remove the old shaft seal; 6) Clean the end cover shaft seal and bearing positions, then clean with 755; 7) Apply 638 adhesive to the shaft seal installation position, then carefully install the shaft seal; be careful not to damage the rubber lip; you can apply some oil or high-temperature grease to the rubber surface of the shaft seal; 8) After cleaning the shaft sleeve position, reinstall and fix the end cover securely (you can wrap a layer of thick glossy paper around the shaft to prevent the shaft seal lip from accidentally touching the keyway during end cover installation); 9) Clean the new shaft sleeve and installation position, apply fixing adhesive 638 to the inner circle of the shaft sleeve. Cold fit: Use a force bar to evenly knock the shaft sleeve in; pad the outside of the new shaft sleeve with an outer ring of the same size to knock it in to avoid damaging the shaft sleeve. Hot fit: Clean the inside of the shaft sleeve thoroughly; there must be no oil. Apply a ring of 638 adhesive to the shaft journal before the shaft seal, heat the shaft sleeve to 110 degrees and install it. (Note: Push the shaft sleeve to the edge of the shaft seal, pause briefly. Wait for the temperature to drop before pushing it into the shaft seal position; 10) Install the pulley or coupling, correct the parallelism or centerline, and manually reverse the head so that the lubricating oil returns to the front bearing and shaft seal.

Norelem seal installation precautions

1) Pay close attention during installation to avoid installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. Check each point with a feeler gauge; the error should not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve; it should be uniform around. Check each point with a feeler gauge; the allowable error should not exceed 0.01 mm. 2) The spring compression amount must be performed according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the face specific pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure and fails to provide a sealing effect. 3) After installing the rotating ring, press the rotating ring against the spring; it should automatically spring back. 4) Installation position requirements: To ensure stable operation, long life, and low leakage performance of the mechanical seal, it is very important to install it correctly on the machine. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, pay attention to any abnormal phenomena such as scratches or defects on the sealing friction pair sealing surfaces and sealing rings. Also check for scratches on the shaft or shaft sleeve surfaces, flanges, and other components in contact with packing and sealing rings (O rings). If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than needed to the site. In this way, if there are remaining parts after installation, it indicates that some parts were missed during installation; if parts are insufficient, it means that parts were assembled in unnecessary places, which serves as a self-check during installation.

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