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Installation, Operation and Maintenance Manual
MAN-02-01-39-0704-EN Rev. 0
Section 6: Spring Conversion to change
All spring packs except the 40 psi consist of an inner and outer spring. The 40 psi spring
pack uses an outer spring only. Various spring packages are available as shown in the
Bettis catalog.
CAUTION
Before attempting spring conversions always be sure that spring is in the 'failed' or
extended position. Remove any accessory equipment that may cause the spring to be
cocked (e.g.: declutchable override, jackscrew override, etc.).
A.
(Models 003)
B.
C.
D.
(All models except 003)
A.
B.
C.
D.
Spring Conversion to change Operating Pressure
Operating Pressure
Back off adjustable travel stop on end of actuator opposite spring end. This will
allow maximum spring extension inside the actuator.
Remove tie rod bolts (41). Back off piston bolt (33) until spring is fully relaxed and
piston (25) is free.
Remove 80 psi spring package and replace with desired spring package.
Re-assemble piston, cylinder, endcap and tie rods, being sure to follow the tie rod
tightening sequence (Figure 5A). Do not over tighten bolts. Refer to Assembly
Torque Requirements Chart (Table 3).
Alternately and uniformly remove bolts (51) from hollow tie rods. Back off each
bolt approximately 1/4", following the tie rod sequence (Figure 5A). Repeat the
sequence until spring(s) is/are totally relaxed and endcap is free.
Remove 80 psi spring package and replace with desired spring package.
Re-assembly endcap with bolts (51). Use reverse procedure as shown in step B,
being sure to follow the tie rod tightening sequence (Figure 5A). Be sure each
hollow tie rod slides into the counterbore in endcap. Do not over tighten bolts.
Refer to Assembly Torque Requirement Chart (Table 3).
Remove nameplate from actuator and stamp or etch correct spring pressure
rating accordingly.
Section 6: Spring Conversion to change Operating Pressure
July 2019
11
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