C491-2

View detailed technical data, stock status, and sourcing information for: C491-2
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-191-6881

Item Name Code

05488

Assigment Date

12/17/1971 (54 years ago)

A capacitor, whose capacitance value cannot be adjusted or varied, having natural sheet mica or reconstituted flaked mica formed into sheets as the dielectric material. It may be a single unit, or consist of two or more fixed units which cannot be separated.

200.0 cubic feet per minute valve discharge flow rate, right-hand 1st end thread direction, 450.0 fahrenheit single response maximum operating temp, disk flow control device, 3a 1st end thread class

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3a 1st end
Thread Direction: right-hand 1st end
Flow Control Device: disk
Valve Discharge Flow Rate: 200.0 cubic feet per minute
Maximum Operating Temp: 450.0 fahrenheit single response
Connection Style: external seat for gasket seal (boss) 1st end
Valve Operation Method: automatic
Connection Type: threaded external boss 1st end
Features Provided: valve stem lock shield and pressure tight outlet side
Thread Quantity Per Inch: 12 1st end
Adjustable Pressure Range: +47.0 to 53.0 pounds per square inch
Maximum Operating Pressure: 60.0 pounds per square inch single response
Nominal Thread Size: 1.312 inches 1st end
Opening Pressure Setting: 50.0 pounds per square inch
Nominal Outside Diameter Tube Accommodated: 1.000 inches 1st end
Material: aluminum alloy 2024 overall
Material Document And Classification: qq-a-225/6,alloy2024 fed spec all material responses overall
Media For Which Designed: air single response
Surface Treatment: anodize
Surface Treatment Document And Classification: mil-a-8625 mil spec single treatment response
Style Designator: straight thru
Thread Series Designator: un 1st end

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
C491-2	Safety Relief Valve
P20-383	Safety Relief Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-00-191-6881?

The FSCG of the NSN 4820-00-191-6881 is 4820

Does the NSN 4820-00-191-6881 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-191-6881 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 4820-00-191-6881 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-00-191-6881 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 4820-00-191-6881 was assigned to the Federal Catalog?

It was assigned 54 years ago, on Fri, Dec 17, 1971