German zimmer Sommer seals, zimmer Sommer models, zimmer Sommer prices

zimmer Sommer 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 hydrodynamic seals. The shaft seal for reciprocating pumps is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and hydrodynamic seals.

zimmer Sommer seal principle

A mechanical seal is a shaft sealing device that achieves leak prevention by keeping one or more pairs of end faces, which slide relative to each other perpendicular to the shaft, in contact 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 a 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. Anti-rotation pins are fixed to the gland to prevent the stationary ring from rotating. The rotating ring and stationary ring can also be referred to as compensating rings or non-compensating rings, depending on whether they have axial compensation capability.

zimmer Sommer 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. Additionally, companies such as Durametallic in the US and the Fluid Sealing Association (formerly part of the Fluid Engineering Study Group) in the UK are researching rational mechanical seal chamber designs. 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, neglecting the control of invisible volatile emissions, which led to environmental pollution and posed risks to equipment and personnel. Organizations such as the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the US have developed guidelines for controlling volatile emissions from rotating machinery, compressors, and screw systems equipped 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 that of the sealed process fluid. A buffer fluid serves as a lubricant or cushion between dual seals, and its pressure is always lower than that 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 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, barrier seal systems commonly used liquid-to-liquid or liquid-to-gas blocking. To simplify bulky barrier liquid systems, gas barriers are now used to block liquids or gases. Gas barrier seal systems may employ spiral groove gas seals with barrier gas, floating bushings with barrier gas, etc., to seal against both gases and liquids.

zimmer Sommer 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 less dust and impurities, resistant to media 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 aforementioned S type oil seals, these also provide dust protection. Standard oil seals with a dust lip can prevent dust ingress and resist media pressure<0.05MPa, linear speed ≤15m/s. 3) Springless type: Springless single-lip inner-case skeleton rubber oil seal. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤6m/s. 4) Outer-case single-lip: Single-lip outer-case skeleton rubber oil seal with spring. Features a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa. For rotational axis linear speeds ≤15m/s. 5) Outer-case double-lip: Double-lip outer-case skeleton rubber oil seal with secondary lip. Features a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress and resist media pressure<0.05MPa. Rotational speed ≤15m/s. 6) Assembled single-lip: Outer-case oil seal assembled from inner and outer skeletons with rolled edges. Features high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed. Media 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. Utilizing hydrodynamic principles, it generates a unidirectional pumping action with a return flow effect. Related to the shaft's direction of rotation. Due to the return flow effect, radial force is lower than that of standard oil seals, reducing wear and heat generation, thereby extending service life. Suitable for media pressure<0.05MPa, rotational speed ≤20m/s. 8) Pressure-resistant type: Short lip and short, thick waist provide pressure resistance. Working pressure ≤3MPa. Suitable for applications with media pressure ≤3MPa. Applicable as shaft end oil seals for high-pressure pumps. Under normal conditions, the PV value ≤8. Rotational axis linear speed ≤15m/s.

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