Nominal Outside Diameter Tube Accommodated: 0.250 INCHES ALL ENDS IN
Features Provided: PRESSURE TIGHT OUTLET SIDE
Bonnet Type: INSIDE SCREW
Identification
NSN: 4820-00-540-1397
NIIN: 005401397
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-00-540-1397, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-540-1397
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Flow Control Device
DISK
Connection Style
GASKET SEAL(BOSS) ALL ENDS
Connection Type
THREADED INTERNAL BOSS ALL ENDS
Style Designator
"Y" ANGLE
Nominal Outside Diameter Tube Accommodated
0.250 INCHES ALL ENDS IN
Features Provided
PRESSURE TIGHT OUTLET SIDE
Bonnet Type
INSIDE SCREW
Thread Direction
RIGHT-HAND ALL ENDS
Nominal Thread Size
0.437 INCHES ALL ENDS IN
Disk Loading Method
SPRING
Bonnet Attachment Method
INTEGRAL
Thread Class
3B ALL ENDS
Material
ALUMINUM ALLOY STEM
Material
ALUMINUM ALLOY SEAT
Material
ALUMINUM ALLOY BODY
Thread Series Designator
UNF ALL ENDS
Opening Pressure Setting
47.0 POUNDS PER SQUARE INCH LBS
Valve Discharge Flow Rate
1.0 CUBIC FEET PER MINUTE
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
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5310-00-753-4155100678POSSIBLE MATCH
WASHER,KEY
Possible match (shared part number)Dana Off Highway Products, Llc
1650-00-866-6030100678POSSIBLE MATCH
HEAD,VALVE
Possible match (shared part number)Woodward Hrt Inc
5915-00-971-5626100678POSSIBLE MATCH
NETWORK,PULSE FORMING
Possible match (shared part number)L3harris Technologies, Inc Div Space & Airborne Systems
5365-01-220-6587100678POSSIBLE MATCH
SPACER,SLEEVE
Possible match (shared part number)Bae Systems Land & Armaments L.p.
5315-01-243-0591100-678POSSIBLE MATCH
PIN,FLOWMETER
Possible match (shared part number)Badger Meter Inc Div Badger Meter
5325-01-385-6023POSSIBLE MATCH
RING,RETAINING
Possible match (shared part number)
6150-01-567-1425100-678POSSIBLE MATCH
CABLE ASSEMBLY,SPECIAL PURPOSE,E
Possible match (shared part number)Santa Barbara Infrared, Inc. Dba Santa Barbara Infrared Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
100-678
3/2Design control — primary reference
U.S. Government activity
Related Parts
5310-00-753-4155POSSIBLE MATCH
WASHER,KEY
100678
1650-00-866-6030POSSIBLE MATCH
HEAD,VALVE
100678
5915-00-971-5626POSSIBLE MATCH
NETWORK,PULSE FORMING
100678
5365-01-220-6587POSSIBLE MATCH
SPACER,SLEEVE
100678
5315-01-243-0591POSSIBLE MATCH
PIN,FLOWMETER
100-678
5325-01-385-6023POSSIBLE MATCH
RING,RETAINING
6150-01-567-1425POSSIBLE MATCH
CABLE ASSEMBLY,SPECIAL PURPOSE,E
100-678
Frequently Asked Questions
What is NSN 4820-00-540-1397?
NSN 4820-00-540-1397 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-540-1397?
7 possible matches (shared part number, not a government interchangeability claim): 5310-00-753-4155, 1650-00-866-6030, 5915-00-971-5626. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-540-1397?
Key specifications for 4820-00-540-1397: Flow Control Device: DISK; Connection Style: GASKET SEAL(BOSS) ALL ENDS; Connection Type: THREADED INTERNAL BOSS ALL ENDS; Style Designator: "Y" ANGLE. 19 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-540-1397 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.