Swagelok Changeover SCO, Руководство пользователя, Страница: 9 / 20

SCO User Manual
9
Operation
The primary gas source of the SCO system is indicated by the changeover handle arrow direction. As the primary gas source
depletes and its pressure equals the secondary source regulator outlet pressure setting, the changeover will occur. The system
will then automatically start pulling from the secondary gas source, supplying an uninterrupted flow downstream.
Note: Due to the regulator orientation, turning the changeover lever handle will increase the outlet pressure setting of the
regulator the arrow will be pointing to after the switch (the “new” primary gas source.) It also decreases the outlet pressure
setting of the regulator the arrow was pointing to prior to the switch (the “new” secondary/depleted gas source.)
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CAUTION Swagelok proportional relief valves are not “Safety Accessories” as defined in the Pressure
Equipment Directive 2014/68/EU.
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CAUTION Do not use the regulator as a shutoff device.
1. To change the primary gas source from the left-hand (LH) source to the right-hand (RH) source, pull the changeover lever
handle from the upward position (12 o’clock) to the downward position (6 o’clock).
Note: The primary gas source changeover regulator is set to a slightly higher outlet pressure than the opposing (secondary)
gas source, establishing the supply for the downstream system. Refer to Setting the Regulator Changeover Pressure .
2. To change out a depleted gas bottle, turn the changeover lever handle fully to its opposing position (i.e., up/down),
reversing the arrow direction. This designates the opposing source as the primary gas source. The depleted gas bottle can
now be safely isolated, vented, and removed, and a full bottle can be installed.
When the replacement of the depleted gas bottle is complete, it is best to allow the SCO to continue depleting the newly
in-use gas source rather than manually switching to the new bottle early. This practice will ensure the secondary gas
source is full when needed.
Note: When the SCO is used as a gas bottle backup to a large gas store such as a gas generator, typically Inlet 1 is connected to
the bulk storage of the generator and Inlet 2 is connected to an emergency backup gas bottle. In these applications, the handle
should be switched back to the bulk storage supply from the backup as soon as practical.