Kastas Technical Catalogue
324Pages

@KASTA$ Hydraulic and Pneumatic Seals

All information contained in our catalogue is released only for general usage and not valid for special applications. Given parameters such as maximum pressure, temperature, sliding speed, surface contact pressure and media are determined in laboratory conditions. In case the operating parameters are requested at maximum level, these values may not be achieved. Design-based system failures arising from our customers do not relate to Kastas Sealing Technologies A.S. In no event will Kastas Sealing Technologies A.S. be liable for any loss, damage, claim or expense directly or indirectly due...

@KASTA$ Hydraulic and Pneumatic Seals TECHNICAL CATALOGUE

Storage of Sealing Elements 14 General Installation Information 14 Units, Quantities and General Tolerances 15 HYDRAULIC SEALING ELEMENTS Working Principle of Sealing Elements 18 Choosing Sealing Elements 18 System Tolerances and Designs 22 General Installation Information 25 ^ HYDRAULIC PISTON-ROD SEALING ELEMENTS Product Programme 33 HYDRAULIC ROD SEALING ELEMENTS Product Programme 61 K31- Heavy Duty Rod Seal 76 K701- Spring Loaded Rod Seal 108 HYDRAULIC PISTON SEALING ELEMENTS Product Programme 113 K18- Compact Piston Seal 124 K19- Heavy Duty Piston...

YOUR PRODUCTIVITY PARTNER Ever since the establishment of our company in 1981, the demand for our extensive range of products has steadily increased as the international market recognized the quality of our products as well as our customer service. The developments are continued with confidence and self-sacrifice keeping the indispensable principles. Fast, reliable, effective solutions are offered with high quality of products to our customers. Continuous innovations are carried through our production, in order to keep up with the globally increasing demand. ALWAYS THE BETTER... We value...

QUALITY AND SERVICE... We have strengthened our company principles with quality control mechanisms that we have built up. We were certified with ISO 16949 Quality Certification in 2007. • All the activities are managed effectively with process approach in order to achieve corporate targets • For us, continuous improvement is not a word it's our company philosophy • We understand the exact needs of our customers and personnel in order to maintain the continuity of customer satisfaction • We create the necessary environment for our employees to use their capabilities in accordance...

SEAL PROGRAMME

SEAL PROGRAMME

TECHNICAL INFORMATION

HISTORY OF RUBBER The first type of the rubber used in the world is the natural rubber and it is obtained from the resin by crosswise cutting of the rubber tree. Commercial usage of the natural rubber started in 1736 with moving from South America to France. During the early applications in England, it was seen that the natural rubber was able to erase the lead pencil and this material was named as “rubber” in the meaning of rubbing. Charles Goodyear managed to vulcanize rubber and sulphur. The First World War proved that rubber was a strategic compound and increasing needs caused the...

POLYTETRAFLUOROETHYLENE-PTFE This material is known as Teflon, the trademark of DUPONT Company. PTFE material does have the lowest coefficient of friction. Due to the low friction coefficient and high wear resistance, it performs well on poorly lubricating conditions as well as high sliding speeds. PTFE can be used in temperatures between -200°C to +260°C. It has very good resistance to all chemicals except alkaline metals, high pressure-temperature chlorotriflour and basic flourines. Hardness and elasticity make the material to be used widely in hydraulic applications. Depending onto the...

The mechanical and physical properties of sealing elements produced from elastomers, thermoplastics and thermoplastic elastomers can change. This could be caused by many factors such as; • Oxygen • Ozone • Direct sun light • High temperature • Ultra-violet rays • Humidity • Dirtand chemical effects The sealing elements produced from elastomers, thermoplastics and thermoplastic elastomers do not change any mechanical or physical properties if not exposed to the above mentioned conditions. OXYGEN AND OZONE These two elements are oxidizing agents. It is recommended to store the seals in the...

UNIT, QUANTITY AND GENERAL TOLERANCES FURTHER OFFICIAL DERIVED UNITS IN MECHANICS 1 ENERGY, WORK, AMOUNT OF HEAT Nm = 1 Joule (J) = 1 Ws PRESSURE MECHANICAL STRESS 1 Pascal (Pa) = 1 N/m2 : 1 Mpa (106 Pa) = 1 N/mm2 = 0.102 kp/mm2 Pa MPa bar kp / cm 2 mm Hg atm mWs

TOLERANCES FOR MACHINED PARTS OF THERMOPLASTICS Permissible deviations of dimensions in mm.

HYDRAULIC SEALING ELEMENTS

HYDRAULIC SEALING ELEMENTS WORKING PRINCIPLE OF SEALING ELEMENTS Hydraulic cylinders are being used in mechanical applications where reciprocating forces and movements are needed. Sealing element is one of the most important parts of the cylinders. The sealing elements are being installed into the respective groove with a preload. Figure 1 shows the sealing element in free state, preload after the assembly of the seal and the free space needed in the housing. The sealing element is able to work in low pressures due to this preload. Figure 2 shows the pressurized media filling into the...

SPEED The speed of the cylinder can go up to 15 m/sec depending on the material of the sealing element, design and the application. Speed is one of the important features which defines the oil film generation and the friction forces. Figure 3 shows increasing of the friction forces with speed increasing and oil film thickness decreasing. That is why at high sliding speeds the sealing elements should be chosen from PTFE material. The sliding speed for the sealing elements can be seen in our Product Programme. MEDIA The minimum and maximum operating temperature of the sealing elements do...

SURFACE ROUGHNESS The surfaces that the sealing elements will be working should be honed, grinded and polished. Surface roughness should be according to the catalogue information of the respective sealing element. Figure 4 shows the schematic of sealing element material matching with the surface roughness values. As it is seen in Figure 4, rubber materials can adopt with the irregularities of the surface; on the other hand PTFE material adaptation is not as good as the other sealing materials. Ra value that we indicate in our catologue is the arithmetic average of the absoloute roughness...