Acquisition method (AMC)
3
FSC 4820 × VALVE,SAFETY RELIEF
VALVE,SAFETY RELIEF
4820-01-520-4351 FSC 4820
NSN 4820-01-520-4351 (also written 4820015204351; NIIN 01-520-4351) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 1 manufacturer part number from 1 supplier is on record. It was last purchased in Oct 2026.
Open for bid
No open solicitations on record for this NSN right now.
Can you win it?
This item is coded to be bought directly from the actual manufacturer (AMC 3).
Suffix (AMSC)
D
Competition
Coded for a named source
AMC 3: buy directly from the actual manufacturer, second or later time. AMSC D: the data needed to compete the part is unavailable or cannot be obtained economically. The codes describe the item's status on record, not any one solicitation. What the codes mean
What it is — can you make it?
Dimensions, the FLIS specification requirements, and the manufacturer part numbers already qualified against this NSN.
Specifications
From the federal catalog (DLA FLIS / PUB LOG) — what your part has to meet. Cited specification documents can be looked up in ASSIST Quick Search ↗, DoD's public spec repository — copy the document number in.
| Requirement | Value |
|---|---|
| FLOW CONTROL DEVICE ADQU | POPPET |
| BONNET TYPE ADSR | INSIDE SPRING |
| BONNET ATTACHMENT METHOD ADST | BOLTED |
| DISK LOADING METHOD ADSU | SPRING |
| BOLT HOLE QUANTITY AECS | 4 |
| MAXIMUM OPERATING TEMP AEHZ | SINGLE RESPONSE FAHRENHEIT 150.0 |
| VALVE OPERATION METHOD AQLR | AUTOMATIC |
| FLANGE SHAPE ARKN | ALL ENDS ROUND WITH HOLES |
| CONNECTION TYPE AWLS | ALL ENDS FLANGE |
| VALVE SIZE CCFG | INCHES 2.000 |
| OPERATING PRESSURE CQQF | SINGLE RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 85.0 |
| OPENING PRESSURE SETTING CSDC | POUNDS PER SQUARE INCH 75.0 |
| NOMINAL OUTSIDE DIAMETER CWCD | ALL ENDS INCHES 6.000 |
| NOMINAL THICKNESS CWCK | ALL ENDS INCHES 0.750 |
| FIRST CONNECTION FACE TO CENTERLINE DISTANCE CWCL | INCHES 5.000 |
| BOLT HOLE NOMINAL DIAMETER CWCQ | ALL ENDS INCHES 0.750 |
| SECOND CONNECTION FACE TO CENTERLINE DISTANCE CWCR | INCHES 5.000 |
| BOLT CIRCLE NOMINAL DIAMETER CWCT | ALL ENDS INCHES 4.750 |
| FLANGE FACE DESIGN CWDF | ALL ENDS RAISED STRAIGHT |
| RAISED FACE NOMINAL HEIGHT CWDH | ALL ENDS INCHES 0.060 |
| RAISED FACE NOMINAL DIAMETER CWDL | ALL ENDS INCHES 3.620 |
| SPECIAL FEATURES FEAT | MEDIA: HFC-236FA REFRIGERENT OR ISO 46 POE LUBRICANT |
| MATERIAL MATT | BODY STEEL CORROSION RESISTING |
| STYLE DESIGNATOR STYL | — |
| TEST DATA DOCUMENT TEST | STANDARD (INCLUDES INDUSTRY OR ASSOCIATION STANDARDS, INDIVIDUAL MANUFACTUREER STANDARDS, ETC.). -IL-STD-167-1 BY CO--ANDER NAVAL SEA SYSTE-S LETTER 9514 SER 05L2 TO 027. 22 FEB 2002 |
Manufacturer part numbers
Commercial part numbers cross-referenced to this NSN in the federal catalog — the parts that have been accepted as satisfying this stock number, and who makes them.
| Part number | CAGE | Manufacturer |
|---|---|---|
| B16511-3 | 04577 | MISSION SYSTEMS ORCHARD PARK INC |
What it pays — so you can quote
The government's own price and demand record for this NSN — what past awards cleared at, so you know where to land your quote.
Latest unit price
—
Purchases
0
Total spend
—
Oct 15, 2026
Last purchased
1 · 1.0/yr
Purchase records
$48,820
Total demand
$48,820
Latest award total
Purchase history
No priced purchases on record for this NSN yet.
Related contract actions
Contract action totals, not unit prices — obligation amounts from USAspending for related awards, shown for context only. These do not appear on the price chart above.
| Action date | Award # | Recipient | Agency | Obligation |
|---|---|---|---|---|
| Oct 15, 2026 | SPE7M127P0555 ↗ | ECI DEFENSE GROUP, INC. DIV ECI-GA | — | $48,820 |
Demand history
Who wins this item
Does one supplier win this every time, and are the winners on the listed-source list? One dot per award.
- Award in the last 2 years
- Older award
ECI DEFENSE GROUP, INC. DIV ECI-GA
last award Oct 2026
MISSION SYSTEMS ORCHARD PARK INC
no award yet
no awards on record
Listed source ECI DEFENSE GROUP, INC. DIV ECI-GA won the only award on record. ECI DEFENSE GROUP, INC. DIV ECI-GA won without being a listed source.
Open RFQs on DIBBS → DIBBS award history ↗
About this data
- Unit prices: DLA DIBBS award records — every row links to its government record.
- AMSC: latest observed value from DIBBS solicitation history as of Oct 16, 2026.
- Contract action totals: USAspending, context only.
- Data last refreshed: 2026-10-16.
- Full methodology →
Cite this page
Citation
NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-01-520-4351/. Data as of October 19, 2026.
Link
https://nsnexplorer.com/nsn/4820-01-520-4351/