German GSR seals GSR models GSR prices

GSR seals are a common term for general seals, simply referring to lubricating oil seals. They are mechanical components used to seal grease (oil is the most common liquid in transmission systems, and also refers to general liquids), isolating lubricated parts from output parts in transmission components to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. Generally, when people refer to oil seals, they often mean this type of tc skeleton oil seal.

GSR seal principle

Mechanical seals are shaft sealing devices that achieve 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. Common mechanical seal structures consist of stationary rings (static rings), rotating rings (dynamic rings), elastic element spring seats, set screws, rotating ring auxiliary O-rings, and stationary ring auxiliary O-rings. Anti-rotation pins are fixed on the gland to prevent the stationary ring from rotating. Rotating rings and stationary rings can also be referred to as compensating rings or non-compensating rings based on whether they have axial compensation capability.

GSR seal system composition

1) Gland housing: In the past, gland housings used for mechanical seals were stuffing boxes designed for soft packing seals. They are not suitable for containing 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 gland housings have been established abroad. In addition, Durametallic Corporation in the United States and the Fluid Sealing Association (formerly the British Fluid Mechanics Research Group) are studying rational mechanical seal gland housings. 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 emission control system: In the past, attention was focused only on eliminating visible fluid leaks, while neglecting the control of invisible volatile emissions. This has resulted in environmental pollution and posed hazards to equipment and personnel. Abroad, for example, the Sealing Technology Committee of the Society of Tribologists and Lubrication Engineers (STLE) in the United States has developed guidelines for controlling volatile emissions from rotating machinery, compressors, and screw systems with mechanical seals, covering 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 double 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 is used between double seals as a lubricant or buffer; its pressure is always lower than that of the sealed process fluid. 3) Supporting systems for auxiliary systems: Auxiliary systems for mechanical seals require supporting components for cooling, heating, flushing, and other functions. Pump circulation needs optimization, and issues such as condition monitoring systems are being studied and resolved. The supporting requirements for auxiliary systems are specified in the API-682 standard. 4) Gas barrier seal system: In the past, liquid barriers were commonly used to seal liquids or gases in barrier seal systems. To simplify bulky barrier liquid systems, barrier gases are now used to seal liquids or gases. In gas barrier seal systems, spiral groove gas seals with barrier gas, floating bushings with barrier gas, and other methods can be employed to seal gases and liquids.

GSR seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can cause steam leakage from the shaft seal, easily leading to water ingress into the oil and deteriorating turbine oil quality. Excessively high shaft seal pressure may trigger the safety valve of the equalizing tank, wasting working media and damaging equipment. 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, seriously threatening 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 can cause intense heating at the shaft end steam seal and rotor steam seal sections, resulting in localized stress concentration and certain deformation. This may alter the clearance between the rotor and cylinder, increase steam leakage from the shaft seal, and enlarge differential expansion, potentially causing serious static-dynamic friction. When the shaft seal temperature is too low, it cools the shaft end steam seal and rotor steam seal sections, similarly causing localized stress concentration, altering the clearance between the cylinder and rotor, increasing steam leakage from the shaft end, and reducing differential expansion. Low shaft seal temperature may also result in water-carrying steam in the shaft seal supply, causing water hammer in the shaft seal supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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