Cashco 1164 - Manual (Page 4)

IOM-1164 4
hand tightening. Mechanically tighten bolting
(13 & 14) in a cross pattern that allows spring
chamber (2) to be pulled down evenly. Rec-
om mend ed torques are as follows:
NOTE: Never replace bolting (13 & 14) with
just any bolting if lost. Bolt heads and nuts
are marked with specifi cation identifi cation
num bers. Use only proper grades as re place-
ments.
13. Reinstall adjusting screw (17) with locknut
(8).
14. Soap solution test around bolting (13 & 14)
and body (1) and spring chamber (2) fl anges
for leakage. Ensure that an inlet pressure is
maintained during this leak test of at least
mid-range level; i.e. 30-80 psig (2.07-5.52
Barg) range spring, 60 psig (4.14 Barg) test
pres sure min i mum.
C. Trim Replacement (For Metal Seated Units):
1. Trim removal requires that the diaphragm be
re moved. Refer to previous procedure Sec tion
VI., Sub-section B, Steps 1 through 8.
2. Remove valve guide (12), valve plug (16) and
spring (7).
3. Inspect seating surface of integral seat ring
(15). If seat ring shows erosion or wear, the
regulator should be replaced.
4. Inspect guide (12), plug (16), O-ring (11) and
spring (7). Inspect parts for ex ces sive wear.
Replace if worn, nicked or de pressed.
5. Clean the body (1) cavity. Clean all parts to be
reused. NOTE: On regulators originally sup-
plied with Option 1164-55, “special cleaned”,
main te nance must include a level of clean li-
ness equal to Cashco’s cleaning standard
#S-1134. Contact factory for details.
6. Reinstall the spring (7). Then place the O-ring
(11) on the plug (16) and the plug (16) into the
valve guide (12).
7. Now place the valve guide (12) (along with
the O-ring (11) and plug (16)) on to the spring
(7).
8. Reinstall diaphragm (9) per Section VI., Sub-
section B., Steps 9 through 14.
9. Bench test unit for suitable operation. NOTE:
Regulators are not tight shutoff devices. Even
if pressure falls below setpoint, a regulator
may or may not develop bubble tight shutoff.
In general, tighter shutoff can be expected
with composition seat.
10. Soap solution test around body (1) fl ange for
leakage. Test pressure should be the max i mum
allowed.
D. Trim Replacement (For TFE Seated Units):
1. Follow same steps as listed under “Trim Re-
place ment - Metal Seated Units” except for
the following guidelines:
2. When inspecting parts for excessive wear
(VI.C.4), ensure there are no foreign particles
em bed ded or nicks in the TFE seat which is
an integral part of the plug assembly. Replace
plug assembly (16) if any of these conditions
are noted.
Regulator Size Bolt Size
Metal Dia-
phragm
3/4" - 1" (DN20,25) 3/8" - 24 30 ft/lbs.
1-1/2" (DN40) 7/16" - 20 45 ft/lbs.
2" (DN50) 1/2" - 20 70 ft/lbs.