Connection Type: UNTHREADED INTERNAL TUBE FIRST END
Style Designator: STRAIGHT THRU
Nominal Outside Diameter Tube Accommodated: 0.875 INCHES FIRST END IN
Operating Pressure: 8.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Identification
NSN: 4820-00-287-2143
NIIN: 002872143
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-00-287-2143, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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.
Technical Specifications
Parameter
Value
NSN
4820-00-287-2143
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Flow Control Device
DIAPHRAGM
Connection Style
SOCKET (TUBE) FIRST END
Criticality Code Justification
ZZZY
Connection Type
UNTHREADED INTERNAL TUBE FIRST END
Style Designator
STRAIGHT THRU
Nominal Outside Diameter Tube Accommodated
0.875 INCHES FIRST END IN
Operating Pressure
8.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Adjustable Pressure Range
+1.0 TO 8.0 POUNDS PER SQUARE INCH LBS
Maximum Operating Temp
-300.0 FAHRENHEIT SINGLE RESPONSE DEGF
Material
COPPER ALLOY FLOW CONTROL DEVICE
Valve Operation Method
AUTOMATIC
Reference Number Differentiating Characteristics
CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
S
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4710-00-340-760318464POSSIBLE MATCH
TUBE ASSEMBLY,METAL
Possible match (shared part number)R.h. Industries, Inc.
5330-00-352-77404F3956POSSIBLE MATCH
GASKET
Possible match (shared part number)Caterpillar Inc Div Caterpillar Defense
6145-00-557-7301POSSIBLE MATCH
CABLE,TELEPHONE
Possible match (shared part number)
4210-01-189-32867-72-101POSSIBLE MATCH
TURBINE,TURRET-ROOF
Possible match (shared part number)Akron Brass Company
6150-01-516-9536POSSIBLE MATCH
WIRING HARNESS
Possible match (shared part number)
4610-01-551-464718464POSSIBLE MATCH
VESSEL ASSEMBLY,REVERSE OSMOSIS
Possible match (shared part number)Parker Hannifin Corporation Div Village Marine Tech
4730-01-664-2526M3174POSSIBLE MATCH
PLUG,PIPE
Possible match (shared part number)Parker Hannifin Corporation Div Village Marine Tech
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
18464CP
5/1Secondary reference
Naval Inventory Control Point Mechanicsburg
18464
3/1Design control — primary reference
Provision, Inc. Dba Provision Inc
Related Parts
4710-00-340-7603POSSIBLE MATCH
TUBE ASSEMBLY,METAL
18464
5330-00-352-7740POSSIBLE MATCH
GASKET
4F3956
6145-00-557-7301POSSIBLE MATCH
CABLE,TELEPHONE
4210-01-189-3286POSSIBLE MATCH
TURBINE,TURRET-ROOF
7-72-101
6150-01-516-9536POSSIBLE MATCH
WIRING HARNESS
4610-01-551-4647POSSIBLE MATCH
VESSEL ASSEMBLY,REVERSE OSMOSIS
18464
4730-01-664-2526POSSIBLE MATCH
PLUG,PIPE
M3174
Frequently Asked Questions
What is NSN 4820-00-287-2143?
NSN 4820-00-287-2143 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-287-2143?
7 possible matches (shared part number, not a government interchangeability claim): 4710-00-340-7603, 5330-00-352-7740, 6145-00-557-7301. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-287-2143?
Key specifications for 4820-00-287-2143: Flow Control Device: DIAPHRAGM; Connection Style: SOCKET (TUBE) FIRST END; Criticality Code Justification: ZZZY; Connection Type: UNTHREADED INTERNAL TUBE FIRST END. 12 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-287-2143 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.