The Valve,safety Relief, cataloged under National Stock Number 4820-01-451-1807, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Valve,safety Relief
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-01-451-1807
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
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
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-451-1824196575-0030POSSIBLE MATCH
PISTON,VALVE
Possible match (shared part number)Marotta Controls Inc
4820-01-451-1999180429-0030POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Marotta Controls Inc
4820-01-451-2000180428-0030POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Marotta Controls Inc
4820-01-451-2239236766-0001POSSIBLE MATCH
VALVE,REGULATING,FLUID PRESSURE
Possible match (shared part number)Marotta Controls Inc
4820-01-451-2254196996-0030POSSIBLE MATCH
PISTON,VALVE
Possible match (shared part number)Marotta Controls Inc
4820-01-451-3723188445-0030POSSIBLE MATCH
GUIDE,VALVE STEM
Possible match (shared part number)Marotta Controls Inc
4820-01-451-4130284047-0003POSSIBLE MATCH
VALVE,ANGLE
Possible match (shared part number)Marotta Controls Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
236765
D/9Drawing number reference only
U.S. Government activity
236765-0001
3/2Design control — primary reference
U.S. Government activity
284244-0002
D/9Drawing number reference only
U.S. Government activity
284244-0002 ITEM NO 1
5/2Secondary reference
U.S. Government activity
Related Parts
4820-01-451-1824POSSIBLE MATCH
PISTON,VALVE
196575-0030
4820-01-451-1999POSSIBLE MATCH
DISK,VALVE
180429-0030
4820-01-451-2000POSSIBLE MATCH
SEAT,VALVE
180428-0030
4820-01-451-2239POSSIBLE MATCH
VALVE,REGULATING,FLUID PRESSURE
236766-0001
4820-01-451-2254POSSIBLE MATCH
PISTON,VALVE
196996-0030
4820-01-451-3723POSSIBLE MATCH
GUIDE,VALVE STEM
188445-0030
4820-01-451-4130POSSIBLE MATCH
VALVE,ANGLE
284047-0003
Frequently Asked Questions
What is NSN 4820-01-451-1807?
NSN 4820-01-451-1807 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-451-1807?
7 possible matches (shared part number, not a government interchangeability claim): 4820-01-451-1824, 4820-01-451-1999, 4820-01-451-2000. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-451-1807 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.