German COG seals, COG models, COG prices

COG seals refer to devices that prevent fluid leakage, formed by at least one pair of end 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 the compensation mechanism, along with the assistance of auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components: a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or fixing screws.

Function of COG 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 leakage 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. This causes working fluid loss, deteriorates the operating environment, and heats the shaft journal or allows steam to enter the bearing housing, causing oil deterioration. Air leakage also breaks the vacuum, thereby increasing the pumping load. These factors reduce unit efficiency. Therefore, shaft seals are installed where the rotor passes through both ends of the cylinder. 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 steam inevitably leaks from the shaft end to the atmosphere, causing loss of working fluid and heat, and also affecting the working environment of the turbogenerator. If adjusted improperly, excessive steam leakage will cause the temperature of the bearings near the shaft seal to rise or cause water to enter the bearing oil. Therefore, 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, heating it and 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 turbine tripping shutdown and the entire hot shutdown process where the condenser needs to maintain a vacuum, prevent air from leaking into the turbine, which would accelerate internal cooling of the turbine and cause main shaft bending.

COG 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 off 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 a little 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 forcing 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 avoid damaging the shaft sleeve. Hot fit: Clean the inside of the shaft sleeve thoroughly, ensuring 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 parallelism or centerline, and manually reverse the machine head to allow lubricating oil to return to the front bearing and shaft seal.

COG seal functions and applications

Engine: Crankshaft - front and rear crankshaft oil seals; Valve - valve oil seals (engine repair kit o 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 O-rings) (Transfer case - front and rear transfer case oil seals); Rear axle: Half shaft - rear half shaft oil seal; Differential - (front) rear angle vector oil seal; Rear wheel oil seal; Front wheel oil seal; Steering gear oil seal (steering gear repair kit o O-rings); Power steering booster oil seal (front half shaft oil seal). Oil seals are required wherever there is liquid lubricating oil inside a rotating body box and it connects to the exterior. Some are made of rubber, some of metal, and most are steel-cased rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half shaft oil seals, final drive front oil seals, and air compressor crankshaft oil seals.

Weidou Intelligent Technology specializes in selling German COG seals, COG O-rings, COG sealing strips, COG pipe seals, COG cable seals, COG rubber seals, COG mechanical seals, COG gaskets, COG oil seals, COG shaft seals, COG metal seals, COG high-pressure seals, COG spiral seals, COG centrifugal seals, COG sealing rings, COG original imports from Germany. Welcome customers to inquire and order.