... operating speeds.3) The sealing orientation for hydraulic seals can include internal (rod seal), external (piston seal), symmetrical or axial seal. With ... working procedures. Application of Seal in Various Industries General mechanical cylinder appropriative seal:USH, UPH, USI, UPI, ODI, IDI, ... SPNRI, WR, BRT, RYT, DB, TAY, VB, TC Pneumatic Cylinder appropriative seal:PGY, PNY, GLY, PSD, PDU, PPY, PRY ...