Cashco 3171 - Manual (Page 4)

4 IOM-3171
14. Rotate the spring chamber (2) CW by hand
into the threaded portion of the body (1) en sur-
ing not to cross thread. Continue ro tat ing CW
until rotation stops. Wrench tight en to 30-35
ft-lbs torque.
15. Reinstall ad just ing screw (5) with locknut (8)
into the spring chamber.
16. Pressurize with air and soap solution test
around body (1) and spring chamber (2)
for leakage. Ensure that an inlet pressure is
main tained during this leak test of at least mid-
range spring level; i.e. 20-80 psig (1.38-5.52
Barg) range spring, 50 psig (3.45 Barg) test
pres sure minimum.
C. Trim Replacement
To prevent damage to body, use lead jaws when
clamping body in a vise. Position body so that vise
does not close over inlet and outlet connections.
CAUTION
1. Trim removal requires that diaphragm sub-
as sem bly be removed. Refer to previous
pro ce dure, Sec tion VI.B.
2. Inspect inside surface of body (1). If seat
shows no erosion/wear on seating surfaces,
piston (12) may be replaced.
3. Clean body (1) cavity. Clean all parts to be
reused. NOTE: Maintenance must include a
lev el of clean li ness equal to Cashco's clean-
ing standard #S-1576. Con tact factory for
details.
4. Reinstall diaphragm subassembly per Sec-
tion VI.B., Diaphragm Replacement.
5. Bench test unit for suitable operation. NOTE:
Reg u la tors are not tight shut off devices. Even
if pressure falls below setpoint, a reg u la tor
may or may not develop bubble tight shut off.
In general, tighter shut off can be ex pect ed
with composition seat.
6. Pressurize with air and soap solution test
around body (1) and spring cham ber (2) joint
for leakage. Test pressure should be the
max i mum al lowed by the range spring at the
inlet.
NOTES