PartsTable TECHNICAL DATA SHEET

NSN 4820-01-270-6547Government record, cited

Disk, Valve4820-01-270-6547

NSN 4820-01-270-6547 · NIIN 012706547 · Part number 911-558 REF.2

Dover Resources, Inc. Div Norriseal · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 1NB39

Government record, cited

NSN 4820-01-270-6547 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-270-6547. Manufacturer of record part number: 911-558 REF.2.

Also searched as 4820-01-270-6547 · 4820012706547 · NIIN 012706547 · 01-270-6547 · FSC 4820 Valves, Nonpowered · CAGE 1NB39 · 911-558 REF.2 · 51310A520 · 51310A520

Nearby stock numbers ← 4820-01-270-6546 · 4820-01-270-6549 Diaphragm, Actuator Valve, Special →

4820-01-270-6547 — Valves, Nonpowered

Features

Disk,valve — FSC 4820
Material: NICKEL ALLOY
2 manufacturer part numbers on file
Manufacturer of record: Dover Resources, Inc. Div Norriseal

Identification

NSN: 4820-01-270-6547
NIIN: 012706547
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 911-558 REF.2
Manufacturer: Dover Resources, Inc. Div Norriseal

General Description

The Disk,valve, cataloged under National Stock Number 4820-01-270-6547, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Resources, Inc. Div Norriseal. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.

Technical Specifications

Parameter	Value
NSN	4820-01-270-6547
Primary Part Number	911-558 REF.2
Item Name	Disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Dover Resources, Inc. Div Norriseal
Status	ACTIVE
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
911-558 REF.2	Dover Resources, Inc. Div Norriseal (USA)
51310A520	Dover Resources, Inc. Div Norriseal (USA)

Reference documents

Reference	Meaning
911-558 REF.2	5/9 Secondary reference U.S. Government activity
51310A520	3/9 Design control — primary reference U.S. Government activity

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 4820-01-270-6547?

NSN 4820-01-270-6547 is a Disk,valve, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-270-6547?

NSN 4820-01-270-6547 has 2 manufacturer part numbers on file: 911-558 REF.2 (Dover Resources, Inc. Div Norriseal), 51310A520 (Dover Resources, Inc. Div Norriseal).

What are the specifications of 911-558 REF.2?

Key specifications for 911-558 REF.2: Overall Height: 2.500 INCHES NOMINAL IN; Material: NICKEL ALLOY. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-270-6547 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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