Valve, Regulating, System Pressure4820-01-291-8539

NSN 4820-01-291-8539 · NIIN 012918539

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-291-8539 · 4820012918539 · NIIN 012918539 · 01-291-8539 · FSC 4820 Valves, Nonpowered

Nearby stock numbers ← 4820-01-291-8532 Seat, Valve · 4820-01-291-8546 Parts Kit, Ball Valve →

4820-01-291-8539 — Valves, Nonpowered

Features

Valve,regulating,system Pressure — FSC 4820
First End Bolt Hole Quantity: 14
Flow Control Device: DISK
Second End Relationship with First End: IDENTICAL
Body Style: STRAIGHT THRU
Face to Face Distance: 25.790 INCHES NOMINAL IN
First End Flange Thickness: 1.310 INCHES MINIMUM IN
First End Style Designator: PLAIN

Identification

NSN: 4820-01-291-8539
NIIN: 012918539
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Valve,regulating,system Pressure, cataloged under National Stock Number 4820-01-291-8539, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-291-8539
Item Name	Valve,regulating,system Pressure
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
First End Bolt Hole Quantity	14
Flow Control Device	DISK
Second End Relationship with First End	IDENTICAL
Body Style	STRAIGHT THRU
Face to Face Distance	25.790 INCHES NOMINAL IN
First End Flange Thickness	1.310 INCHES MINIMUM IN
First End Style Designator	PLAIN
First End Bolt Hole Diameter	0.688 INCHES NOMINAL IN
First End Bolt Circle Diameter	11.062 INCHES NOMINAL IN
Material Document and Classification	MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE BODY
End Connection Quantity	2
First End Connection Type	PLAIN FACE FLANGE
First End Flange Shape Style	ROUND W/ BOLT HOLES
Material	COPPER ALLOY 922 BODY

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

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
68549-01	3/2 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 4820-01-291-8539?

NSN 4820-01-291-8539 is a Valve,regulating,system Pressure, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-291-8539?

Key specifications for 4820-01-291-8539: First End Bolt Hole Quantity: 14; Flow Control Device: DISK; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU. 14 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-291-8539 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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