Valve, Safety Relief4820-01-185-4305

NSN 4820-01-185-4305 · NIIN 011854305

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-185-4305 · 4820011854305 · NIIN 011854305 · 01-185-4305 · FSC 4820 Valves, Nonpowered

Nearby stock numbers ← 4820-01-185-4304 Valve, Check · 4820-01-185-4306 Valve, Safety Relief →

4820-01-185-4305 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
Connection Style: PLAIN (PIPE) SECOND END
Operating Pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Adjustable Pressure Range: +525.0 TO 900.0 POUNDS PER SQUARE INCH LBS
Bonnet Type: INSIDE SCREW
Nominal Thread Size: 1.250 INCHES FIRST END IN
Nominal Thread Size: 0.500 INCHES SECOND END IN
Bonnet Attachment Method: THREADED

Identification

NSN: 4820-01-185-4305
NIIN: 011854305
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-185-4305, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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	4820-01-185-4305
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Connection Style	PLAIN (PIPE) SECOND END
Operating Pressure	6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Adjustable Pressure Range	+525.0 TO 900.0 POUNDS PER SQUARE INCH LBS
Bonnet Type	INSIDE SCREW
Nominal Thread Size	1.250 INCHES FIRST END IN
Nominal Thread Size	0.500 INCHES SECOND END IN
Bonnet Attachment Method	THREADED
Material	BRONZE BODY
Thread Series Designator	NPT SECOND END
Thread Series Designator	NPT FIRST END
Valve Operation Method	AUTOMATIC

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
PL1867.438DRF 525T900PSI	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 4820-01-185-4305?

NSN 4820-01-185-4305 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-185-4305?

Key specifications for 4820-01-185-4305: Connection Style: PLAIN (PIPE) SECOND END; Operating Pressure: 6000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Adjustable Pressure Range: +525.0 TO 900.0 POUNDS PER SQUARE INCH LBS; Bonnet Type: INSIDE SCREW. 11 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-185-4305 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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