Valve, Safety Relief4820-01-423-8020

NSN 4820-01-423-8020 · NIIN 014238020 · Part number 4138A033

Perkins Engines Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 13446

Government record, cited

NSN 4820-01-423-8020 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-423-8020. Manufacturer of record part number: 4138A033.

Also searched as 4820-01-423-8020 · 4820014238020 · NIIN 014238020 · 01-423-8020 · FSC 4820 Valves, Nonpowered · CAGE 13446 · 4138A033

Nearby stock numbers ← 4820-01-423-7814 Sleeve, Valve, Gate · 4820-01-423-8028 Retainer, Shaft, Valve →

4820-01-423-8020 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
Disk Loading Method: SPRING
Media for Which Designed: OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE
1 manufacturer part number on file
Manufacturer of record: Perkins Engines Inc

Identification

NSN: 4820-01-423-8020
NIIN: 014238020
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 4138A033
Manufacturer: Perkins Engines Inc

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-423-8020, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Perkins Engines Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-423-8020
Primary Part Number	4138A033
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Perkins Engines Inc
Status	ACTIVE
Disk Loading Method	SPRING
Media for Which Designed	OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE

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
4138A033 PRIMARY	Perkins Engines Inc (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 4820-01-423-8020?

NSN 4820-01-423-8020 is a Valve,safety Relief, manufactured by Perkins Engines Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-423-8020?

NSN 4820-01-423-8020 has 1 manufacturer part number on file: 4138A033 (Perkins Engines Inc).

What are the specifications of 4138A033?

Key specifications for 4138A033: Disk Loading Method: SPRING; Special Features: USED ON LUBRICATING OIL PUMP AND DELIVERY HOUSING; Media for Which Designed: OIL, LUBRICATING, DIESTER BASE SINGLE RESPONSE; End Item Identification: SHIPBOARD MATERIEL H. 2 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-423-8020 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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