Emerson Process Management BETTIS G01 - Manual (Page 27)

Bettis P/N 124840E
Revision “B”
Page 23 of 46
3.4.4 Install piston rod (3-40) through inner end cap (3-10). NOTE: The piston rod end with
retainer grooves to be on the outboard side of inner end cap (3-10).
3.4.5 Apply lubricant to two sets of rod T-seal components (4-50).
NOTE: The T-seal is composed of one rubber seal and two split skive-cut back-up rings.
3.4.5.1 Install two sets of rod T-seals (4-50) into the internal diameter seal grooves of
piston (3-30).
3.4.5.2 Install a back-up ring on each side of the T-seal.
3.4.5.3 When installing the back-up rings, do not align the skive-cuts.
3.4.5.4 If the back-up rings are too long and the rings overlap beyond the skive-cuts, then
the rings must be trimmed with a razor sharp instrument.
3.4.6 Coat one D-ring seal (4-60) with lubricant and install into the piston external seal groove.
NOTE: The flat side of the D-ring seal goes down into the seal groove.
3.4.7 Install piston (3-30) onto piston rod (3-40). NOTE: The cast rib side of the piston is to be
facing away from the outboard side of inner end cap (3-10) or position piston (3-30) on the
piston rod so that the retainer grooves are on the out board side of the piston.
3.4.8 Refer to assembly drawing page 2 of 2 Detail "D". Install o-ring seal (4-70) into the seal
groove in the outboard end of piston rod (3-40).
3.4.9 Install two split ring halves (3-50) into the outer most groove in piston rod (3-40) and retain
by installing the recessed area of piston (3-30) over the two split halves (3-50).
3.4.10 Install two split ring halves (3-50) into the piston rod, in back of the piston and retain with
retainer ring (3-60).
3.4.11 Coat two tie bars (3-20) with lubricant and install by carefully pushing tie bars through
piston (3-30) and rod T-seal (4-50).
3.4.12 Install two tie bar o-ring seals (4-80) onto the inboard end of tie bars (3-20) and into the o-ring
grooves provided.
3.4.13 Insert the tie bars through inner end cap (3-10) and screw hex nuts (3-90) onto inboard end
of the tie bars. NOTE: Screw the tie bars through the hex nuts (3-90) until one complete
thread is exposed.
3.4.14 Refer to assembly drawing page 2 of 2 Detail "E". Install two tie bar o-ring seals (4-80) onto
the outboard end of tie bars (3-20) and into the o-ring grooves provided.
3.4.15 Apply lubricant to one o-ring seal (4-40) and install into the outer diameter o-ring groove of
outer end cap (3-80).
3.4.16 Apply lubricant to the bore of cylinder (3-70).