Pneumatic Cylinders - Norman Equipment Co.

Pneumatic CylindersOptionsAdditional options required will help determine which cylinder series will be selected:Stainless steel piston rods are beneficial in corrosive environments. Stainless steel rods are standard on Micro-Air and SilverairSeries. Stainless Steel rods are options on Economair and Provenair Series.Cylinder cushions are designed to reduce the shock experienced at the end of the stroke by reducing piston speed the last fractionof an inch of stroke. Cylinder cushions are available in Economair and Provenair Series, only.Packing shape and material affect cylinder performance:• O-Ring packings are good, general purpose packings, but they require more breakaway force than other packing shapes.• O-Ring – Low Friction packings provide the effective sealing characteristics of Buna N with the low friction characteristics ofTeflon ® . This design is effective where the cylinder must operate at low pressures.• U-Cup packings offer low breakaway friction and better sealing characteristics at low pressure than O-Ring packings. U-cupsare wear compensating seals; they offer longer wear life than O-rings.• U-Cup – Self Lube (“Slippery Seals”) packings are ideal in applications where air line lubrication cannot be used. This packingdesign helps reduce cylinder “chatter” in low pressure applications and it offers the same sealing characteristics as Buna N.Packing CharacteristicsSealing Friction TemperatureMaterial Characteristics Characteristics Tolerance AvailabilityO-RING Teflon over Good Medium 0° to 180° F EconomairBuna N O-Ring SealO-RING Buna N Good High 0° to 180° F Micro-Air, EconomairO-RING Viton ® Good High Up to 300° F Micro-Air, EconomairU-CUP-SELF-LUBE(“Slippery Seals") Nitrile Very Good Low 0° to 180° F Economair, ProvenairU-CUP Buna N Very Good Medium 0° to 180° F Economair, ProvenairU-CUP Viton Very Good Medium Up to 300° F Economair, ProvenairNote: When applying rod cylinders, there must be no side load or bending stress at any point along the rod. Applications which induce side load and/or bendingstress will damage packings, bushings, piston barrels, piston rods and cushion bosses. When metal parts are damaged, seal and packing replacement is aninadequate repair. The elastomers will quickly become damaged. Inspect and replace all worn or damaged parts when rebuilding cylinders.Teflon® and Viton® are registered trademarks of the E.I. DuPont Company.8