Cashco PBE Pressure Build Economizer - Manual (Page 4)

IOM-PBE 4
4. Rotate body cap (16) CCW to remove from
body.
5. Remove piston spring (18), piston assembly
(17) and u-cup seal (22). Inspect TFE seat-
ing surface on the piston assembly (17).
NOTE: The pis ton (17) assembly can not be
dis-assembled. If the TFE seat is damaged,
re place the entire piston assembly.
6. Clean body (1) cavity and all parts to be re-
used. NOTE: Regulator originally sup plied as
“oxygen clean”, main te nance must include a
lev el of clean li ness equal to Cashco's clean-
ing stan dard #S-1134. Contact factory for
de tails.
7. To re-install trim, slide new u-cup seal (22)
(open end of cup facing down) into recess in
body.
8. Slide the piston assembly into the body, TFE
seat end in fi rst. NOTE: Piston should move
freely up and down within the body cavity.
9. Center the piston spring (18) on top of the
piston.
14. Rotate the spring chamber (2) CW by hand
into the threaded portion of the body (1)
ensuring not to cross thread. Continue ro tat-
ing CW until fi rmly seated against the upper
di a phragm gasket (12). Tighten to 30-35 ft-lbs
(41-47 N-m) torque.
15. Apply Christolube or equivalent to threads of
adjusting screw (3) and install ad just ing screw
with locknut (4) into the spring chamber (2).
C. Trim Replacement:
1. Trim inspection requires that the diaphragm
subassembly be removed. Refer to Sec tion
VI.B. Steps 1-9.
2. Inspect seating surface of plug (14) and seat-
ing surface of seat ring (15). If either seating
surface shows signs of erosion/wear, the plug
(14) and seat ring (15) should be replaced.
3. To remove piston assembly, secure body
(1) in a vise with the body cap (16) oriented
upwards.
10. Apply Formula 8 thread sealant to the body
cap (16) male threads. Carefully position the
body cap over the piston spring and engage
the threads. NOTE: While engaging the
threads - may encounter minimum resistance
from upward force of the piston spring. With
hand pressure continue to press body cap
down evenly until threads are fully engaged.
Tighten to 30-35 ft.lbs. (41-47 N-m). These
two parts seal metal-to-metal with no gasket.
11. Re-orient body assembly in vise and secure
by the body cap, (body cap oriented down).
12. Place economizer seat ring in the recess in
the body. Concave seat surface face up.
13. Reinstall diaphragm subassembly, spring,
etc. per Sec tion VI.B. Steps 10-15.
CAUTION
To prevent damage to the body, use soft jaws when secur-
ing body in a vise. Position body so that vise does not
close over the inlet and the outlet connections.