STASSKOL GmbH
About us
STASSKOL has been active in sealing technology for over 100 years. The product portfolio includes seals for compressors, shaft seals for use in rotating equipment and high-performance Polymers developed and manufactured in-house.
STASSKOL seals are used in a wide variety of industrial sectors, such as the food industry, aerospace, vacuum technology, mechanical engineering or the petrochemical industry. In contrast to other suppliers, STASSKOL is not only able to manufacture the seals in standard sizes and designs, but also to optimally adapt the dimensions, material selection and sealing system to the customer's application. In addition, the sealing experts develop their own sealing solutions for applications that are particularly demanding in terms of process temperatures, pressures and the medium to be sealed.
When manufacturing the seals, STASSKOL uses high-performance polymers from its own production, which are permanently temperature-resistant up to 300°C, wear-resistant in high-pressure processes up to 1000 bar, resistant to acids, grease and solvents and can be manufactured up to a diameter of 1200mm.
The company has test equipment that is unique in the world and a research and development department that has developed a number of patents over the past few years.
STASSKOL operates in Europe from its location in Stassfurt, Germany, has representatives in China, India and Japan and another production site in the USA. 130 employees work for the company worldwide.
Products
SDF series - The new shaft seal for trouble-free operations. The SDF series seals reliably, minimizes product loss, leakage and wear, has a long service life and is easy to install and clean. The sealing material used is food-grade.
Fine material products, such as dusts and powders, as well as liquids or liquid-solid mixtures place special demands on the sealing of a shaft. The new SDF Series - STASSKOL DynamicSeal Faceseal - has been developed specifically for this purpose. The seal can generally be used in all mechanical systems with a shaft. The task of a seal in these machines is to reliably seal the agitator shaft, minimize mixing losses and protect the mixing material from contamination. It should also prevent medium from entering the bearings and causing damage there. In summary, the aim is to ensure trouble-free operation of the plant and thus of the entire process. The STASSKOL DynamicSeal Faceseal combines the advantages of the known shaft seals without compromising on functionality. The axially contacting sealing surface minimizes leakage. The large radial clearance in the sealing chamber makes it possible, to maintain the sealing function even if the shaft runs highly out of round by up to 4 mm. The bearing of the sealing rings on the elastic inner component ensures contact at the dynamic sealing surfaces even in the case of misalignment between shaft and housing, effectively preventing leakage. The use of sealing gas also ensures that if particles unexpectedly enter the sealing gap, they are blown out again. This greatly extends the service life of the STASSKOL DynamicSeal Faceseal. In order to obtain optimum properties with regards to temperature development, wear and strength in the area of application, STASSKOL developed the new material SK933 for the sealing rings. The minimalist design with few components enables easy, quickly and safely assembly, disassembly and cleaning at the point of use. All sealing elements and the housing are axially separable so that the seal can be mounted around the shaft without having to remove bearings and other attachments. In addition, the elastic inner component has a specially designed puzzle joint. The materials used are food-compliant.
SDK40 - labyrinth seal system with non split housings and radial adjustable sealing rings
The shaft seal type SDK40 is used in order to seal technical gases, dust and vapour mainly in tubines, compressors and other high pressure devices with sub- and overcritical rotors. Use of the SDK80 can reduce leakage rates by up to 90%. The technical design of this sealing system is subject to meticulous information about the operating conditions and about the characteristic data of materials.
SDW20 - The series SDW20 STASSKOL DynamicSeal shaft sealing is primarily intended for the sealing of fans, blowers, compressors, stirrers, decanters, gearboxes, steam turbines, etc
The field of application ranges from high vacuum to pressures of 30bar, from slow turning shafts to 150m/s sliding speed, at operating temperatures from 190°C to 600°C for media from plain air to highly toxic and/or abrasive gases. The STASSKOL DynamicSeal SDW20 consists of the housing and 3 to 7 sealing rings according to the variation. The most current variation is the SDW20-kv-S, the short design with reduced outside diameter and a connection for buffer gas. Various PTFE compounds and special artifical carbon grades are available for the sealing rings. These materials are applied in high-temperature aplications up to 600°C. The available sealing materials have been designed to run dry and do not require any lubrication.
SDS100 - The STASSKOL SynamicSeal SDS100 were developed for high-pressure applications.
Depending on the application this shaft seal allows the reduction of leakage about 25% with shorter fitting length. Thereby the assembly of seals is easier due to less components, and also budget-priced up to 30%. The STASSKOL DynamicSeal SDS100 consists of a shortened housing, sealing rings and a flange. Compared to the industrial standard STASSKOL inserts a reduced number of wide rings instead of a lot of small rings. Thereby the fitting length can be reduced . Design and combination of rings are variable. The STASSKOL DynamicSeal of series SDS100 is used in fan blowers and geared compressors in high-pressure applications.
Piston Rod Packing - are used in double-acting reciprocating compressors to seal the crank-side cylinder.
STASSKOL designs and manufactures a range of piston rod packings suitable for all applications used in reciprocating piston compressors. We manufacture piston rod packings for both lubricated and non-lubricated conditions, with cooled or non-cooled cases. All our designs can be supplied with additional connections for leakage gas, buffer gas, purge gas and temperature monitoring to suit the operating conditions. With our unique Engineered packings and Special Polymer Materials, STASSKOL can design and manufacture packings that can operate in the most EXTREME CONDITIONS. One such example; HYDROGEN NON-LUBRICATED very high pressures compressors used for HYDROGEN transportation and fueling. Other examples including specially developed packings for very high pressure Non-Lubricated CNG compressors, compressing Natural Gas up 300bar.
SDW50 - Sliding shaft seals with split housing
The STASSKOL DynamicSeal shaft seal from the SDW50 series is the preferred choice for sealing shafts in fans, agitators, dryers, mixers and fermenters etc. Its field of application ranges from vacuum up to pressures of 0,5bar permitted pressure difference per sealing ring, from slow-turning shafts up to 45m/s sliding speed, at operating temperatures of up to 500°C, and with media from pure air to high-toxic and/or abrasive gases. The saft seals DSW50 can be offered with connection for suction drain and buffer gas. The short design, that is contrary to the standard design is offered without connections.
Piston Rings and Rider Bands
Piston rings and rider bands are used in horizontal, vertical and v-shaped cylinders. STASSKOL manufactures a wide range of one-piece or multipiece piston rings and rider bands with and without expansion springs as well as pressure-relief grooves. The axial and radial dimensions and the ring gaps are decided for long-life cycle of the piston and rider rings. The basis for the exact calculation is mean piston temperature as well as the coefficient of expansion of used materials.
SDK40 - labyrinth seal system with non split housings and radial adjustable sealing rings
The shaft seal type SDK40 is used in order to seal technical gases, dust and vapour mainly in tubines, compressors and other high pressure devices with sub- and overcritical rotors. Use of the SDK80 can reduce leakage rates by up to 90%. The technical design of this sealing system is subject to meticulous information about the operating conditions and about the characteristic data of materials.SDK40 is a labyrinth seal system with non split housings and radial adjustable sealing rings. Compared to a rigid lip seal, the SDK40 is significantly more efficient, especially with supercritical rotors.