Piston, Valve4820-01-390-3631

NSN 4820-01-390-3631 · NIIN 013903631 · Part number 595-6404638-13

Naval Sea Systems Command · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 53711

Government record, cited

NSN 4820-01-390-3631 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-390-3631. Manufacturer of record part number: 595-6404638-13.

Also searched as 4820-01-390-3631 · 4820013903631 · NIIN 013903631 · 01-390-3631 · FSC 4820 Valves, Nonpowered · CAGE 53711 · 595-6404638-13 · 211039675 · DF2085-202 FIND 13

Nearby stock numbers ← 4820-01-390-3629 Retainer, Disk, Valve · 4820-01-390-3633 Cap, Valve →

4820-01-390-3631 — Valves, Nonpowered

Features

Piston,valve — FSC 4820
Outside Diameter: 1.993 INCHES NOMINAL IN
Material: NICKEL ALLOY
3 manufacturer part numbers on file
Manufacturer of record: Naval Sea Systems Command

Identification

NSN: 4820-01-390-3631
NIIN: 013903631
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 595-6404638-13
Manufacturer: Naval Sea Systems Command

General Description

The Piston,valve, cataloged under National Stock Number 4820-01-390-3631, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-390-3631
Primary Part Number	595-6404638-13
Item Name	Piston,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Naval Sea Systems Command
Status	ACTIVE
Outside Diameter	1.993 INCHES NOMINAL IN
Material	NICKEL ALLOY

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
211039675	Naval Sea Systems Command (USA)
595-6404638-13 PRIMARY	Naval Sea Systems Command (USA)
DF2085-202 FIND 13	Huntington Ingalls Inc Div Newport News Shipbuilding (USA)

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-390-3631?

NSN 4820-01-390-3631 is a Piston,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-390-3631?

NSN 4820-01-390-3631 has 3 manufacturer part numbers on file: 211039675 (Naval Sea Systems Command), 595-6404638-13 (Naval Sea Systems Command), DF2085-202 FIND 13 (Huntington Ingalls Inc Div Newport News Shipbuilding).

What are the specifications of 595-6404638-13?

Key specifications for 595-6404638-13: Outside Diameter: 1.993 INCHES NOMINAL IN; Material: NICKEL ALLOY. 2 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-390-3631 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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