Catalogue 6 - STAUFF Valves

124 www.stauff.com/6/en/#124 G Nomenclature Definitions Nominal Pressure PN The nominal pressure indicates the pressure rate of a hydraulic component and continuous dynamic application. The number is rounded up in order to comply with the internationally specified terms. These nominal pressure values are internationally recognised and assist to appoint common component dimensions. For all ball valves conform to a design and test pressure 1.5 x PN according to DIN 3230 T5 and ISO 5108 for body. For ball seats we admit 1,1 x PN. The nominal pressure specifies the admissible working overpressure at +20°C / 68°F. Please consider the pressure reduction at higher temperature. Maximum Working Pressure P max. P max. is the maximum working pressure of a component including pressure peaks for limited duration of dynamic application resp. the maximum working pressure which considers temperature reduction ratings. Burst Pressure P Burst The safety factor for burst pressure tests is a minimum of 2.4 times the nominal pressure. P Burst = 2.4 x PN Nominal Diameter DN The nominal diameter is a numeric dimension of mating parts without indication of outer tube diameter or thread size, for example flanges. The nominal diameters match approximately the clear diameter of the ball valves in mm. Reduced diameters are marked by STAUFF with for example DN25/32. That corresponds to the ball valve being DN 25 and the adapter being DN 32. Leakage Rate Leakage rate of ball valves with synthetic ball seats: DIN EN 12266 leakage rate A (No visually noticeable leakage during the duration of the test with fluid or air). Standard Materials Material Description Standard Temperature Range 1 Applications Free Cutting Steel 11SMn30 (formerly 9SMn28K) 1.0715 / DIN EN 10277-3 (SAE 1213) -20°C ... +120°C -4°F ... +248°F General oil hydraulics without special requirements on the material Low Alloy Steel S355J2G3 (formerly St52-3) 1.0570 / DIN EN 10025 -40°C ... +120°C -40°F ... +248°F General oil and water hydraulics as well as gas applications with special requirements to the yield stress Stainless Steel X6CrNiMoTi17-12-2 X5CrNiMo17-12-2 X2CrNiMo17-13-2 DIN EN 10088 1.4571 (AISI 316 Ti) 1.4401 (AISI 316) 1.4404 (AISI 316 L) -200°C ... +200°C -328°F ... +392°F Special applications in the chemical and power industries with specific requirements on the material and corrosion protection Valve Body, Connections Adapters, Stem and Ball Ball Seats 1 General temperature limits: A rating above the indicated limits is possible when the temperature reduction ratings are taken into consideration. 2 Pressure / temperature curve must be observed. Material Description Trade Name Temperature Range Applications Polyacetal POM Delrin Hostaform C Ultraform -30°C ... +100°C -86°F ... +212°F High pressure and wear resistance, low water absorption, particularly suitable for hydraulic oils, other oils and water based hydraulic fluids Polytetrafluorethylene PTFE Teflon Hostflon Fluon -200°C to +220°C 2 -328°F ... +428°F 2 Excellent chemical resistance to almost all fluids, no water absorption, low surface friction. (Suitable for food FDA-US Food and Drug Administration) Higher characteristic compounds available. Polyvinnylidenfluorid PVDF Dyflor Kynar Solef -40°C ... +120°C 2 -40°F ... +302°F 2 Mechanical properties like Teflon, but higher rigidity and lower thermal stability, resistant to ketones and esters at higher temperatures Polyetheretherketone PEEK Arlon Victrex -40°C ... +250°C -40°F ... +482°F Good chemical resistance to many mediums, suitable for steam, high temperature resistance, high wearability Cast iron GG25 0.60257 DIN 1651 -40°C ... +250°C -40°F ... +482°F Applications for abrasive fluids Material description Trade Name Temperature Range Applications Acrylonitrile Butadiene Rubber NBR Buna N Perbunan Hycar Chemigum -30°C ... +100°C -86°F ... +212°F Good technical properties, therefore especially suitable for oils and gaseous mediums Fluor Rubber FPM Viton Fuorel Tecnoflon -20°C ... +200°C -4°C ... +392°F High chemical resistance to various mediums, in particular mineral oils, fuels and concentrated acids Ethylene Propylene Diene Monomer Rubber EPDM Buna AP Nordel -50°C ... +130°C -58°C ... 266°F Good ageing stability, low wear, especially suitable for actylene, brake fluids, hot water, superheated steam, cooling gases, low-flammable liquids based upon Phosphoric acid Polytetrafluorethylene PTFE Teflon Hostflon Fluon -200°C ... +220°C 2 -328°F ... +428°F 2 Excellent chemical resistance to almost all fluids, no water absorption, low surface friction. (Suitable for food FDA-US Food and Drug Administration) Higher characteristic compounds available. Stem and Adapter Sealing Materials Catalogue 6 § Edition 06/2023 Technical Appendix