493-16SS28-1/2

View detailed technical data, stock status, and sourcing information for: 493-16SS28-1/2
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-190-0984

Item Name Code

05487

Assigment Date

09/23/1984 (41 years ago)

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes:valve (1), relief, pressure and temperature.

poppet flow control device, -40.0 fahrenheit 1st response maximum operating temp, 3b 1st end thread class, right-hand 1st end thread direction, 250.0 fahrenheit 2nd response maximum operating temp

Product Characteristics

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

Thread Class: 3b 1st end
Thread Direction: right-hand 1st end
Flow Control Device: poppet
Maximum Operating Temp: -40.0 fahrenheit 1st response
Maximum Operating Temp: 250.0 fahrenheit 2nd response
Connection Style: gasket seal (boss) 1st end
Valve Operation Method: automatic
Connection Type: threaded internal boss all ends
Mounting Position: horizontal
Thread Quantity Per Inch: 12 1st end
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 1.313 inches all ends
Material: steel corrosion resisting body
Material: steel corrosion resisting flow control device
Material: steel corrosion resisting seat
Media For Which Designed: acetylene 2nd response
Media For Which Designed: air 1st response
Media For Which Designed: alcohol, ethyl 3rd response
Media For Which Designed: ammonia, gaseous 4th response
Media For Which Designed: carbon dioxide 5th response
Style Designator: straight thru
Thread Series Designator: un all ends

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-01-173-4593	No Name Available	01/01/2000

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
259T-16BB	Check Valve
493-16SS28-1/2	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-190-0984?

The FSCG of the NSN 4820-01-190-0984 is 4820

Does the NSN 4820-01-190-0984 have a Schedule B code assigned?

Yes, the Schedule B code is 8481302090

Does NSN 4820-01-190-0984 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 4820-01-190-0984 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-190-0984 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 4820-01-190-0984 was assigned to the Federal Catalog?

It was assigned 41 years ago, on Sun, Sep 23, 1984