Material Document and Classification: QQ-N-637 FED SPEC SINGLE MATERIAL RESPONSE
Valve Size for Which Designed: 0.250 INCHES IN
Valve Design Control Activity: 99565
Material: COPPER ALLOY
Identification
NSN: 4820-01-534-2951
NIIN: 015342951
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Retainer,disk,valve, cataloged under National Stock Number 4820-01-534-2951, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-534-2951
Item Name
Retainer,disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Material Document and Classification
QQ-N-637 FED SPEC SINGLE MATERIAL RESPONSE
Valve Size for Which Designed
0.250 INCHES IN
Valve Design Control Activity
99565
Material
COPPER ALLOY
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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-534-9063004821DEPOSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-537-7555PLC-10373POSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-575-3059480-1 PLC-10373(MOD)POSSIBLE MATCH
VALVE,GLOBE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-575-5044465-1 PLC-10373MOD G SOFT GOODSPOSSIBLE MATCH
CARTRIDGE,NEEDLE VALVE
Possible match (shared part number)Admiral Valve Llc Dba Cpv Manufacturing
4820-01-641-2481POSSIBLE MATCH
RETAINER,DISK,VALVE
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
PLC-10373
D/9Drawing number reference only
U.S. Government activity
087430AG
3/2Design control — primary reference
U.S. Government activity
PLC-10373-7
5/2Secondary reference
U.S. Government activity
Related Parts
4820-01-534-9063POSSIBLE MATCH
STEM,FLUID VALVE
004821DE
4820-01-537-7555POSSIBLE MATCH
VALVE,GLOBE
PLC-10373
4820-01-575-3059POSSIBLE MATCH
VALVE,GLOBE
480-1 PLC-10373(MOD)
4820-01-575-5044POSSIBLE MATCH
CARTRIDGE,NEEDLE VALVE
465-1 PLC-10373MOD G SOFT GOODS
4820-01-641-2481POSSIBLE MATCH
RETAINER,DISK,VALVE
Frequently Asked Questions
What is NSN 4820-01-534-2951?
NSN 4820-01-534-2951 is a Retainer,disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-534-2951?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-534-9063, 4820-01-537-7555, 4820-01-575-3059. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-534-2951?
Key specifications for 4820-01-534-2951: Material Document and Classification: QQ-N-637 FED SPEC SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 0.250 INCHES IN; Valve Design Control Activity: 99565; End Item Identification: OHIO CLASS SSBN (TRIDENT). 4 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-534-2951 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.