How should the piston rings for piston wear be chosen? What is the national standard?
Cylinder piston due to long-term reciprocating motion, reciprocating piston seals should be used to require wear-resistant, oil corrosion resistance, hardness is best at about 85 degrees.The choice of sealing ring material is of great importance to its sealing performance and service life. The performance of the material directly affects the performance of the sealing ring.
Material applicationNBR NBR sealing ring: suitable for use in petroleum system, hydraulic oil, glycol hydraulic oil, two ester lubricating oil, gasoline, water, silicon grease, silicone oil and other media. It is the most widely used and lowest cost rubber seal at present. Not suitable for polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. The general use temperature range is -40~120 degrees centigrade.
Two, HNBR hydrogenated nitrile rubber sealing ring: with excellent corrosion resistance, tear resistance and compression deformation characteristics, ozone resistance, sun resistance, weather resistance better. Better abrasion resistance than nbr. The utility model is suitable for washing machines, automobile engine systems and refrigeration systems using new environmental protection refrigerant R134a. Not recommended for use in alcohols, esters, or aromatic solutions. The general use temperature range is -40~150 degrees centigrade.Three, SIL silicone rubber sealing ring: with excellent heat resistance, cold resistance, ozone resistance, atmospheric aging resistance. Has good insulation performance. But the tensile strength is inferior to that of ordinary rubber and has no oil resistance. Applicable to household appliances, such as electric water heaters, electric irons, microwave ovens, etc.. The utility model is also suitable for various articles which have contact with human bodies, such as a kettle, a water dispenser, etc.. Not recommended for use in most concentrated solvents, oils, concentrated acids, and sodium hydroxide. The general use temperature range is -55~250 degrees centigrade.
