Table of Contents
Advertisement
Type SR8
1. If damage to the diaphragm or seating surface is
suspected or to inspect other internal parts, loosen
the locknut (key 17) or locking lever (key 22) and
turn the adjusting screw (key 18) counterclockwise
to remove all spring compression.
2. Loosen the sanitary clamp (key 15) to
remove the spring case (key 14). Remove the
upper spring seat (key 11) and the regulator
spring (keys 12 and 13, when applicable).
3. Remove the diaphragm assembly and plug from
the body (key 1). Inspect parts for damage.
When disassembling a unit with a metal
diaphragm, replace both diaphragm
gaskets (key 6) to ensure a good seal at
the diaphragm flange.
Replace the piston ring (key 5), if it has
been removed from the guide ring (key 9).
Take care not to damage the piston ring
during replacement.
4. If parts require replacement, loosen the nut (key 16)
while holding wrench flats on plug (key 3) and
remove the lock washer (key 24) and flat washer
(key 23). The lower spring seat (key 8), guide ring
(key 9), diaphragm (key 7) and plug O-ring (key 3)
can now be removed from the plug (key 2). An
optional lower diaphragm plate (key 10) and O-ring
(key 4) are included for the constructions offering
protection against vacuum conditions.
5. Replace any damaged parts. Refer to the section
titled Soft Seat Maintenance when the seat needs
to be replaced.
6. Reassemble in the reverse order of the above
procedure. The order is listed below or refer
to Figure 3.
a. Plug (key 2)
b. Plug O-ring (key 3)
c. Diaphragm plate (key 10) (vacuum
protection construction only)
d. Diaphragm plate O-ring (key 4) (vacuum
protection construction only)
e. Diaphragm gasket (key 6) (Metal
diaphragms only)
f . Diaphragm (key 7)
g. Diaphragm gasket (key 6) (Metal
diaphragms only)
h. Guide ring assembly (keys 9 and 5)
i . Lower spring seat (key 8)
j . Flat Washer (key 23)
k. Lock Washer (key 24)
l . Hex Nut (key 16)
6
Note
7. Hold wrench flats on plug (key 2), then torque hex
nut (key 16) to 6 to 8 in-lbs / 0.7 to 0.9 N•m for
the 1/2 and 3/4 in. / 15 and 20 mm, 5 to 7 ft-lbs /
7 to 9 N•m for the 1 and 1-1/2 in. / 25 and 40 mm
and 28 to 30 ft-lbs / 38 to 41 N•m for 2 and 3 in. /
50 and 80 mm. After tightening the hex nut, apply
threadlocker medium/high strength sealant or
equivalent to the nut/thread interface.
8. Position diaphragm assembly in body (key 1).
Replace regulator spring (keys 12 and 13, when
applicable) and upper spring seat (key 11).
Replace the spring case (key 14) and sanitary
clamp (key 15). Torque clamp nuts to 20 to
22 ft-lbs / 27 to 30 N•m for the 1/2 through
1-1/2 in. / 15 mm through 40 and 38 to 40 ft-lbs /
52 to 54 N•m for the 2 and 3 in. / 50 and 80 mm.
Lubricate the adjusting screw (key 18)
threads and the sanitary clamp bolt
threads (key 15) to reduce galling of
Stainless steel. Factory recommends
anti-seize lubricant.
Keep even spacing between clamp
halves when tightening clamp nuts.
This will ensure even loading of the
diaphragm. If clamp halves touch, please
contact factory for a replacement clamp.
9. Follow Startup and Adjustment procedures.
Soft Seat Maintenance
Take care not to damage the internal/wetted surface
finish when performing Soft Seat Maintenance.
1. Disassemble the regulator as stated in the
prior section.
2. To access soft seat (key 28), unscrew the lower
plug (key 27) from the upper plug (key 26). If
damaged, replace with new part. Apply Loctite 246
or equivalent to external thread before tightening.
Proper torque for the assembly is 6 to 8 in-lbs /
0.7 to 0.9 N•m for the 1/2 and 3/4 in. / 15 and
20 mm; 8 to 10 in-lbs / 0.9 to 1.1 N•m for the 1 and
1-1/2 x 1 in. / 25 and 40 x 25 mm; and 5 to 7 ft-lbs /
7 to 9 N•m for the 1-1/2 in. / 40 mm. Torque for 2 and
3 in. / 50 and 80 mm is 23 to 25 ft-lbs / 31 to 34 N•m.
3. Reassemble as stated in the prior section.
Note
Advertisement
Table of Contents
