87-CS-165 31T50 MODML-185

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-052-3975

Item Name Code

05488

Assigment Date

12/15/1977 (48 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.

plain (pipe) 1st end connection style, disk flow control device, automatic valve operation method, right-hand all ends thread direction, los angeles class ssn(688) end item identification

Product Characteristics

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

Thread Direction: right-hand all ends
Flow Control Device: disk
End Item Identification: los angeles class ssn(688)
Connection Style: plain (pipe) 1st end
Valve Operation Method: automatic
Connection Type: threaded external pipe all ends
Maximum Operating Pressure: 50.0 pounds per square inch single response
Nominal Thread Size: 0.500 inches 2nd end
Nominal Thread Size: 0.750 inches 1st end
Material: copper alloy body
Material Document And Classification: qq-c-390,alloy d4/d/ fed spec single material response body
Media For Which Designed: air single response
Style Designator: angle
Thread Series Designator: npt all ends

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
87-CS-165 31T50 MODML-185	Safety Relief Valve
87CS165M0D31T50	Safety Relief Valve
87CS165MOD31T50PSI	Safety Relief Valve
9521 AND ML185	Safety Relief Valve
9521-31T50-ML-185	Safety Relief Valve
D42UU-03 1/2 X 3/4 IN.	Safety Relief Valve
D42UU-03H-1/2-3/4	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-052-3975?

The FSCG of the NSN 4820-01-052-3975 is 4820

Does the NSN 4820-01-052-3975 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-052-3975 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 4820-01-052-3975 contain precious materials?

Precious metal content is unknown

Does NSN 4820-01-052-3975 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 4820-01-052-3975 was assigned to the Federal Catalog?

It was assigned 48 years ago, on Thu, Dec 15, 1977