Type SR8
5
Over pressuring any portion of this
equipment may result in equipment
damage, leaks in the valve, or personal
injury due to bursting of pressure-
containing parts. The system should be
inspected after any overpressure condition.
Startup
The regulator is factory set to the midpoint of the
spring range. Please refer to the Adjustment section
for directions on changing the setpoint. With proper
installation completed, slowly open the upstream and
downstream shutoff valves.
Note
When the pressure load option is used,
always open block valves on main line
before applying loading pressure to the
spring case to avoid diaphragm damage.
Adjustment
The setting of the regulator can be varied within the
pressure range stamped on the nameplate. Setpoint is
dened as the point the regulator starts to open. Build
up above setpoint is required to achieve maximum
capacity. To change the setpoint, loosen the locknut
(key 17, Figure 4) or locking lever (key 22, Figure 4) and
turn the adjusting screw (key 18, Figure 4) clockwise to
increase the setpoint, or counterclockwise to decrease
it. Monitor the inlet pressure with a test gauge during
the adjustment. Tighten the locknut or locking lever to
maintain the desired setting. Available set pressure
ranges, recommended maximum allowable differential
pressures and spring data are shown in Tables 2 and 3.
Shutdown
Close the upstream shutoff valve. Close downstream
shutoff valve. Open the applicable bleed valves to
exhaust the system.
Note
When the pressure loaded option is
used, bleed all pressure from the spring
case before bleeding pressure under the
diaphragm to avoid internal part damage.
Maintenance
Before disassembling the regulator,
isolate it from the pressure system and
release all pressure from the regulator
as specied in the Shutdown section.
Relieve all spring compression and isolate
regulator from the pressurized system
prior to removing the clamp (key 15).
Due to normal wear that may occur, parts must be
periodically inspected and replaced if necessary.
The frequency of inspection depends on the severity
of service conditions. A Preventative Maintenance
schedule should be implemented that checks regulator
set point and lockup and that evaluates regulator
performance to the system requirements. Regulator
performance outside the system requirements will
require either adjustment, part maintenance or
regulator replacement to meet system requirements.
This section includes instructions for disassembly
and replacement of parts. All key numbers refer to
Figure 4 or 5.
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.
Note
When disassembling a unit with a metal
diaphragm, replace both diaphragm
gaskets (key 6) to ensure a good seal at
the diaphragm ange.
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 ats on plug (key 3) and remove
the lock washer (key 24) and at washer (key 23). The
lower spring seat (key 8), guide ring (key 9), diaphragm
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