... 1) Hydraulic seals describe a class of seals that are used in applications with either rotary or reciprocating motions. 2) Hydraulic ... , UPH, USI, UPI, ODI, IDI, OSI, ISI, SPG, LBH, LBI Engineering machinery appropriative seal:SPGW, SPG, SPGO, OUHR, OSI, OUY, HBY, HBTS ...