451350 seals Germany schnorr model 451350 price

451350 seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After passing inspection and pressure testing, the unit is mounted on the shaft within the stuffing box, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates with parallel faces and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering these advantages. Cartridge seals are also a type of cartridge mechanical seal. In this seal, the stationary ring, rotating ring, shaft sleeve, gland, and auxiliary seals are all assembled together on a shaft sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

451350 seal classification

1) Packing seal: The packing seal has a simple structure, low cost, and is easy to maintain. However, it has high leakage 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) provide good sealing performance with minimal 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 particulate content. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 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 pressure of the medium 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 point, the shutdown sealing device provides the seal. Packing seals are commonly used in shutdown sealing 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 prevent 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 offer reliable performance, low cost, and easy maintenance, 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 shorter service life of 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 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.

451350 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 of the seal faces and seal damage. 3) Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (not more than 5 drops/min for heavy oil, not 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.

451350 seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam blowout from the shaft seal, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure will trigger the safety valve of the equalizing tank, wasting working fluid and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, which seriously threatens equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat causes intense heating at the shaft end steam seal and rotor steam seal section, leading to local stress concentration and certain deformation. This may change the clearance between the rotor and cylinder, increase steam leakage from the shaft seal, increase differential expansion, and potentially cause rubbing between rotating and stationary parts. When the shaft seal temperature is too low, the shaft end steam seal and rotor steam seal section are cooled, also causing local stress concentration, changing the clearance between the cylinder and rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. Low shaft seal temperature may also cause water carryover in the shaft seal supply steam, leading to water hammer in the shaft seal supply pipeline. In severe cases, this can cause water ingress into the turbine.

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