PartsTable TECHNICAL DATA SHEET

NSN 4820-01-283-4809Government record, cited

Valve, Safety Relief4820-01-283-4809

NSN 4820-01-283-4809 · NIIN 012834809 · Part number VR00221

W S Darley & Co · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 15852

Government record, cited

NSN 4820-01-283-4809 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-283-4809. Manufacturer of record part number: VR00221.

Also searched as 4820-01-283-4809 · 4820012834809 · NIIN 012834809 · 01-283-4809 · FSC 4820 Valves, Nonpowered · CAGE 15852 · VR00221 · G147A21 · 004531V · 051-00019 · G147A8

Nearby stock numbers ← 4820-01-283-4808 Valve, Check · 4820-01-283-4830 Valve, Diaphragm, Stop →

4820-01-283-4809 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
3 manufacturer part numbers on file
Manufacturer of record: W S Darley & Co

Identification

NSN: 4820-01-283-4809
NIIN: 012834809
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: VR00221
Manufacturer: W S Darley & Co

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-283-4809, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is W S Darley & Co. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.

Catalog Facts

Item Name	Valve,safety Relief
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	Kovatch Corp. (CAGE 59556); W S Darley & Co (CAGE 15852)

Technical Specifications

Parameter	Value
NSN	4820-01-283-4809
Primary Part Number	VR00221
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	W S Darley & Co
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
004531V	Kovatch Corp. (USA)
051-00019	Kovatch Corp. (USA)
VR00221 PRIMARY	W S Darley & Co (USA)

Reference documents

Reference	Meaning
G147A21	5/9 Secondary reference W S Darley & Co
G147A8	5/9 Secondary reference W S Darley & Co

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 4820-01-283-4809?

NSN 4820-01-283-4809 is a Valve,safety Relief, manufactured by W S Darley & Co, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-283-4809?

NSN 4820-01-283-4809 has 3 manufacturer part numbers on file: 004531V (Kovatch Corp.), 051-00019 (Kovatch Corp.), VR00221 (W S Darley & Co).

Is NSN 4820-01-283-4809 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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