Acquisition method (AMC)
1
FSC 4820 × VALVE,SAFETY RELIEF
VALVE,SAFETY RELIEF
4820-00-591-5331 FSC 4820
NSN 4820-00-591-5331 (also written 4820005915331; NIIN 00-591-5331) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 2 suppliers are on record. No purchases are on record yet.
Open for bid
No open solicitations on record for this NSN right now.
Can you win it?
This item is coded as suitable for competitive acquisition (AMC 1).
Suffix (AMSC)
G
Competition
Coded for competition
AMC 1: suitable for competitive acquisition, second or later time. AMSC G: the government has a complete data package and the rights to use it. 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 |
|---|---|
| OPENING PRESSURE SETTING CSDC | POUNDS PER SQUARE INCH 120.0 |
| SPECIAL FEATURES FEAT | WITH SCREEN,COPPER 22 BY 22 MESH,0.015 IN. DIA WIRE,SOLDERED ON MALE END |
| MATERIAL MATT | BODY COPPER ALLOY |
| MATERIAL MATT | FLOW CONTROL DEVICE COPPER ALLOY |
| VALVE DISCHARGE FLOW RATE ADSY | GALLONS PER MINUTE 10.0 |
| CONNECTION STYLE AHNC | — |
| MATERIAL MATT | SEAT COPPER ALLOY |
| STYLE DESIGNATOR STYL | — |
| NOMINAL PIPE SIZE ACCOMMODATED AAAR | SECOND END INCHES 0.500 |
| SUPPLEMENTARY FEATURES SUPP | SOLDER WITH ITEM USING MINIMUM AMOUNT OF HEAT POSSIBLE; WRAP BODY OF VALVE WITH WET CLOTH BEFORE APPLYING HEAT |
| NOMINAL PIPE SIZE ACCOMMODATED AAAR | FIRST END INCHES 0.500 |
| PART NAME ASSIGNED BY CONTROLLING AGENCY CXCY | VALVE, PRESSURE RELIEF MODIFIED |
| CONNECTION TYPE AWLS | SECOND END THREADED EXTERNAL PIPE |
| FLOW CONTROL DEVICE ADQU | POPPET |
| CONNECTION TYPE AWLS | FIRST END THREADED INTERNAL PIPE |
| THREAD DIRECTION AAJF | FIRST END RIGHT-HAND |
| THREAD DIRECTION AAJF | SECOND END RIGHT-HAND |
| DISK LOADING METHOD ADSU | SPRING |
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 |
|---|---|---|
| 12C506M1 | 98437 | ELLIS & WATTS INTERNATIONAL, LLC |
| RV51-164 | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE 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
—
—
Last purchased
—
Purchase records
—
Total demand
—
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.
No related contract actions on record.
Demand history
Every solicitation we've indexed for this NSN, open and closed — 1 on record. Closed RFQs (expired, cancelled, or awarded) stay here as a record of past demand; they never get removed.
| Solicitation | Issued | Closes / closed | Qty | Status | |
|---|---|---|---|---|---|
| SPE7MC-27-T-0086 | Oct 6, 2026 | Oct 16, 2026 | 16 | Expired | View at DIBBS → |
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 10, 2026.
- Contract action totals: USAspending, context only.
- Full methodology →
Cite this page
Citation
NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-00-591-5331/. Data as of October 19, 2026.
Link
https://nsnexplorer.com/nsn/4820-00-591-5331/