CS200 Series
8
If the downstream system is not pressurized by another
regulator or manual bypass valve, use the following
procedure to startup the regulator.
1. Check to see that all appliances are turned off.
2. Slowly open the upstream shutoff valve.
3. Check inlet and outlet pressure for correct values.
4. Check all connections for leaks.
5.
Turn on utilization equipment and recheck
the pressures.
Adjustment
Note
The range of allowable pressure setting is
stamped on the nameplate. If the required
setting is not within this range, substitute
the correct spring (as shown in Table 3). If
the spring is changed, change the nameplate
to indicate the new pressure range.
A pressure gauge must always be used to monitor
downstream pressure while adjustments are being made.
1. Remove the closing cap (key 60, Figure 5).
2. To increase the outlet setting, turn the adjusting screw
(key 65, Figure 5) clockwise. To decrease the outlet
setting, turn the adjusting screw counterclockwise.
3. Replace the closing cap.
Shutdown
Installation arrangements may vary, but in any
installation it is important that the valves be opened or
closed slowly and that the outlet pressure be vented
before venting inlet pressure to prevent damage caused
by reverse pressurization of the regulator. The steps
below apply to the typical installation as indicated.
1. Open valves downstream of the regulator.
2. Slowly close the upstream shutoff valve.
3. Inlet pressure should be automatically released
downstream as the regulator opens in response to the
lowered pressure on the diaphragm.
4. Close outlet shutoff valve.
Maintenance
!
WARNING
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without first isolating the
regulator from system pressure and relieving
all internal pressure as described
in “Shutdown”.
Regulators that have been disassembled for
repair must be tested for proper operation
before being returned to service. Only parts
manufactured by Regulator Technologies
should be used for repairing Fisher
®
regulators. Restart gas utilization equipment
according to normal startup procedures.
Due to normal wear or damage that may
occur from external sources, this regulator
should be inspected and maintained
periodically. The frequency of inspection
and replacement of parts depends upon
the severity of service conditions or the
requirement of local, state, and federal
rules and regulations.
Maintenance on Types CS205 and CS206
Secondary Seat™ Protection
The Type CS205 regulator does not have any means
to alert when the Secondary Seat operates at lockup.
Therefore it is recommended that a periodic lockup
test be done on the regulator to determine if the lockup
pressure has elevated to the values in Table 5. If so, the
regulator primary disk and orifice should be replaced.
Types CS205IR and CS206IR have internal relief. Internal
relief operation on these units is an indication that the
Secondary Seat Protection on the Type CS205IR may not
be working and that the Type CS206 Secondary Seat may
have closed. Maintenance should address any potential
causes for internal relief operation as well as other
regulator malfunctions separate from the Secondary Seat.
Disassembly to Replace Diaphragm
1. Remove the closing cap (key 60,
Figure 5). Turn the
adjusting screw (key 65) counterclockwise to ease
spring compression.
2. Remove the adjusting screw and spring (key 38).
3. Remove hex nuts (key 16) and cap screws (key 15).
Separate the upper spring case (key 1) from
the lower casing assembly (key 9). Note
vent orientation.
Note
When disassembling a CS200 Series
regulator, lift the upper spring case
straight up in order to avoid hitting the
relief valve stem (key 44, Figure 5).
4. Slide the diaphragm assembly (key 55) away from
the body (key 70) to unhook the pusher post (key 51)
from the lever (key 10). Lift off the diaphragm head
assembly (key 55).
5.
For Types CS200IN and CS205IN (Non-relieving
units),
unscrew the retainer screw (key 45, Figure 6)
using a 5/8-inch / 16 mm wrench. The screw retainer
