German Verder seals Verder models Verder prices

Verder seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals.

Verder seal principle

A mechanical seal is a shaft sealing device that achieves leak prevention by maintaining contact between one or more pairs of end faces sliding relative to each other perpendicular to the shaft, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, supplemented by auxiliary seals. A common mechanical seal structure consists of components such as the stationary ring (static ring), rotating ring (dynamic ring), elastic element spring seat, set screws, rotating ring auxiliary O-ring, and stationary ring auxiliary O-ring. An anti-rotation pin is fixed to the gland to prevent the stationary ring from rotating. The rotating ring and stationary ring can also be referred to as compensation rings or non-compensation rings, depending on whether they have axial compensation capability.

Verder seal system composition

1) Seal chamber: In the past, seal chambers housing mechanical seals were stuffing boxes designed for soft packing seals. They are unsuitable for housing mechanical seals, not only because the dimensions are too small and the clearances too narrow, but also because the simple cylindrical shape is inappropriate. Standards for enlarged mechanical seal chambers have been established abroad. In addition, companies such as Durametallic in the United States and the Fluid Engineering Study Group in the United Kingdom are studying rational mechanical seal chambers. Their shapes should not only facilitate fluid flow and heat dissipation but also help remove solid particles, creating a favorable environment for the seal. 2) Volatile organic compound (VOC) emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while invisible VOC emissions were neglected, resulting in environmental pollution and hazards to equipment and personnel. Abroad, organizations such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States have developed guidelines for controlling volatile emissions in rotating machinery, compressors, and screw systems with mechanical seals, including SP-30 (1994), SP-32 (1990), and SP-33 (1991). SP-30 is implemented in three stages. It clearly defines barrier fluids and buffer fluids, clarifying erroneous and confusing concepts. A barrier fluid is introduced between dual seals to completely block process fluid from leaking into the surrounding environment. The pressure of the barrier fluid is always higher than the pressure of the sealed process fluid. A buffer fluid is used between dual seals as a lubricant or buffer, and its pressure is always lower than the pressure of the sealed process fluid. 3) Auxiliary system integration: Mechanical seal auxiliary systems require integration of cooling, heating, and flushing systems. Pump circulation needs optimization, and issues such as condition monitoring systems are being studied and resolved. The integration of auxiliary systems is specified in the API-682 standard. 4) Gas barrier seal system: In the past, liquid-blocking-liquid or liquid-blocking-gas configurations were commonly used in barrier seal systems. To simplify bulky barrier liquid systems, barrier gases are now used to block liquids or gases. Spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods can be employed to block gases and liquids in barrier seal systems.

Verder seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary factor causing leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This is due to reduced contact pressure between the oil seal lip and the shaft, resulting in insufficient interference fit between the installed oil seal lip diameter and the shaft diameter. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearing; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify counterfeit and inferior products, and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface of the shaft diameter has low roughness or defects such as rust spots, corrosion, or burrs, polish it smooth with fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use special tools to rotate and press the oil seal inward. Never hammer or force it in, to prevent deformation of the oil seal or breakage of the spring, which would cause failure. If lip flipping, spring detachment, or oil seal skewing occurs, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring when the shaft diameter is not worn and the oil seal spring tension is sufficient. Oil seals used in machinery generally operate under harsh conditions, with large environmental temperature differences, abundant dust, and frequent vibration causing constantly changing stress on components. Therefore, frequent inspection, maintenance, and upkeep are required. If the shaft diameter and bearing are severely worn, or if the oil seal rubber is aged or the spring has failed, repair and replace the corresponding parts promptly. Troubleshoot abnormal heating in components or assemblies immediately. Avoid overspeeding or overloading the machinery to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the engine oil contains excessive impurities, such as alloy powder or metal shavings, completely replace it with new oil. The brand and quality of the replacement oil must meet seasonal requirements. It is recommended to add Metraile Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seals and gears, and reduce gearbox noise. The use of this Metraile super sealant lubricant will not contaminate or degrade the oil.

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