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PILOTS 812, 813, 815
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| It should be understood that there is essentially no difference in the operation of the three rotary pilots used in the 8100 series. Only in a few physical characteristics do they vary. |
PILOT MODEL 812
Of the three rotary float pilots, the non-adjustable 812 is the simplest. Connected to the main valve by a sense line 3/8” NPT or larger, the 812 can be installed in the tank simply by suspending it from this line. Although the pilot is primarily designed for modulation, if high-level shutoff is desired, the 812 can be set to throttle the valve closed over the last few inches of level change. Liquid off the bonnet of the main valve is discharged by the pilot directly into the tank. The 812 is suitable for both water and fuel service, although it does not lend itself to installation in floating roof tanks. |
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PILOT MODEL 813
The 813 rotary float pilot operates identically to the 812 described above, but, in addition, is equipped with an adjustable float and is constructed to provide an air gap between the float and pilot. The float assembly allows the operator to make appropriate changes in float position to accommodate specific operating conditions. The air gap feature prevents cross-connection. The (adjustable length) float arm of the 813 is counterweight-balanced for free and effortless movement. |
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PILOT MODEL 815 (Chamber-Mounted Pilot)
Used primarily for fuel installations, the non-adjustable 815 rotary float pilot is specifically designed for floating roof tanks or similar installations where access to the interior of the vessel is inconvenient or impossible. The 815 installs on the exterior of the tank and, once in place, operates identically to the 812. Liquid off the bonnet of the main valve is vented back into the chamber, or, if desired, back to the outlet of the main valve. |
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