System Components
UL EX-4510 12-1-01 Page 1-20
Description
The flanged pressure reducer assembly is required to
restrict the flow of INERGEN
®
agent thus reducing the
agent pressure down stream of the pressure reducer. The
flanged pressure reducer assembly contains a stainless
steel orifice plate which is drilled to the specific size hole
required based on the flow calculation.* The orifice plate
provides readily visible orifice identification. The flanged
pressure reducer assembly is available in three sizes; 2
1/2, 3, and 4 in. Each size is available in threaded, slip-on,
and weld neck flange.
All orifice plates must be installed in the piping system with
the orifice identification information on the tab facing the
pressure inlet side of the system.
Flanged Pressure Reducer
Shipping
Assembly
Part No. Description A B C D E
427880 2 1/2 in Threaded 5.98 in. 9.62 in. 12.10 in. 7.50 in. 1.12 in. (8)
(152 mm) (244 mm) (307 mm) (191 mm) (28 mm)
427881 3 in. Threaded 6.24 in. 10.50 in. 12.65 in. 8.00 in. 1.25 in. (8)
(158 mm) (267 mm) (321 mm) (203 mm) (32 mm)
427882 4 in. Threaded 7.60 in. 12.25 in. 14.22 in. 9.50 in. 1.38 in.(8)
(193 mm) (311 mm) (362 mm) (241 mm) (35 mm)
427883 2 1/2 in. Slip-on 5.98 in. 9.62 in. 12.10 in. 7.50 in. 1.12 in. (8)
(152 mm) (244 mm) (307 mm) (191 mm) (28 mm)
427884 3 in. Slip-on 6.74 in. 10.50 in. 12.65 in. 8.00 in. 1.25 in. (8)
(171 mm) (267 mm) (321 mm) (203 mm) (32 mm)
427885 4 in. Slip-on 8.10 in. 12.25 in. 14.22 in. 9.50 in. 1.38 in. (8)
(206 mm) (311 mm) (362 mm) (241 mm) (35 mm)
427886 2 1/2 in. Weld Neck 9.22 in. 9.62 in. 12.10 in. 7.50 in. 1.12 in. (8)
(234 mm) (244 mm) (307 mm) (191 mm) (28 mm)
427887 3 in. Weld Neck 10.22 in. 10.50 in. 12.65 in. 8.00 in. 1.25 in. (8)
(260 mm) (267 mm) (321 mm) (203 mm) (32 mm)
427888 4 in. Weld Neck 10.74 in. 12.25 in. 14.22 in. 9.50 in. 1.38 in. (8)
(273 mm) (311 mm) (362 mm) (241 mm) (35 mm)
Component Material Approvals
Flange Forged Steel UL Listed
Flange Gasket Stainless Steel (EX-4510)
Orifice Plate Stainless Steel
Bolts Plated Steel,
Grade 7B
NOTE: Refer to “Nozzle/Pressure Reducer Range Chart” in
Design Section for detailed orifice range information.
* Orifice diameter must be specified when placing order.
ANSUL
®
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