PartsTable TECHNICAL DATA SHEET

NSN 4820-01-231-9559Government record, cited

Seat, Valve4820-01-231-9559

NSN 4820-01-231-9559 · NIIN 012319559 · Part number H45481

Defense Maritime Solutions, Inc. · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 0EYA6

Government record, cited

NSN 4820-01-231-9559 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-231-9559. Manufacturer of record part number: H45481.

Also searched as 4820-01-231-9559 · 4820012319559 · NIIN 012319559 · 01-231-9559 · FSC 4820 Valves, Nonpowered · CAGE 0EYA6 · H45481 · H-45481 · H-45481

Nearby stock numbers ← 4820-01-231-9558 Seat, Valve · 4820-01-231-9560 Seat, Valve →

4820-01-231-9559 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
1 manufacturer part number on file
Manufacturer of record: Defense Maritime Solutions, Inc.

Identification

NSN: 4820-01-231-9559
NIIN: 012319559
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: H45481
Manufacturer: Defense Maritime Solutions, Inc.

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-231-9559, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Defense Maritime Solutions, Inc.. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Catalog Facts

Item Name	Seat,valve
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	Defense Maritime Solutions, Inc. (CAGE 0EYA6)

Technical Specifications

Parameter	Value
NSN	4820-01-231-9559
Primary Part Number	H45481
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Defense Maritime Solutions, Inc.
Status	ACTIVE

Lifecycle & Compliance

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

Cross-Reference Index

Part Number	Manufacturer
H45481 PRIMARY	Defense Maritime Solutions, Inc. (USA)

Reference documents

Reference	Meaning
H-45481	5/9 Secondary reference John Crane, Inc
H-45481	5/9 Secondary reference Wartsila Lips Inc

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 4820-01-231-9559?

NSN 4820-01-231-9559 is a Seat,valve, manufactured by Defense Maritime Solutions, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-231-9559?

NSN 4820-01-231-9559 has 1 manufacturer part number on file: H45481 (Defense Maritime Solutions, Inc.).

Is NSN 4820-01-231-9559 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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