The piston rod stud and the piston rod to piston
threaded connections are secured with an anaerobic adhesive which is
temperature sensitive. Cylinders specified with fluorocarbon seals are
assembled with anaerobic adhesive having a maximum operating
temperature rating of +250°F (+121°C). Cylinders specified with all other
seal compounds are assembled with anaerobic adhesive having a
maximum operating temperature rating of +165°F (+74°C). These temperature
limitations are necessary to prevent the possible loosening of
threaded connections. Cylinders originally manufactured with standard
seals that will be exposed to ambient temperatures above +165°F
(+74°C) must be modified for higher temperature service. Contact the
factory immediately and arrange for the piston to rod and the stud to
piston rod connections to be properly reassembled to withstand the
higher temperature service
Piston seals (fig. 1) maintain sealing contact between the piston and the cylinder bore. Differential pressures acting on the piston to extend or retract the piston rod can be in excess of 400 bar (5 800 psi). The pressure acting on the piston seal increases contact forces between the piston seal and cylinder surface. Therefore, the surface properties of the sealing surfaces are critical to proper seal performance (→ Counter-surface finish properties).
Piston seals are typically classified into single-acting (pressure acting on one side only) and double-acting (pressure acting on both sides) seals.
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