PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20081C51MValve,safety Relief

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-285-0689 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-285-0689 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-285-0689. Primary manufacturer part number: 20081C51M.
Features
  • Valve,safety Relief — FSC 4820
  • Adjustable Pressure Range: +15.0 TO 19.0 POUNDS PER SQUARE INCH LBS
  • Connection Type: FLANGE FIRST END
  • Disk Loading Method: SPRING
  • Material: COPPER ALLOY BODY
  • Connection Type: UNTHREADED INTERNAL PIPE SECOND END
  • Valve Operation Method: AUTOMATIC
  • Flow Control Device: DISK
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy Body construction
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-285-0689, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-285-0689
Primary Part Number20081C51M
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusACTIVE
Adjustable Pressure Range+15.0 TO 19.0 POUNDS PER SQUARE INCH LBS
Connection TypeFLANGE FIRST END
Disk Loading MethodSPRING
MaterialCOPPER ALLOY BODY
Connection TypeUNTHREADED INTERNAL PIPE SECOND END
Valve Operation MethodAUTOMATIC
Flow Control DeviceDISK
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3110-00-144-8869R-200ZZSD502RDA1P15LY48U INTERCHANGEABLE
Bearing,ball,annular
New Hampshire Ball Bearings Inc Div Precision Division
5342-00-147-639920081 INTERCHANGEABLE
Cap,shipping
Eaton Aerospace Llc Dba Eaton Aerospace Jackson
3455-00-236-3637 INTERCHANGEABLE
Reamer,machine
5330-00-251-405724609 INTERCHANGEABLE
Gasket
Dana Automotive Systems Group, Llc Dba Dana Sealing Products
4130-00-400-2418ERP12 7-8IN0DF INTERCHANGEABLE
Regulator,pressure
Emerson Electric Co Alco Controls Div
6350-00-410-854020081 INTERCHANGEABLE
Knob Assembly,panel
M/a-Com Government Products Inc
5315-00-786-399813554 INTERCHANGEABLE
Pin,lock
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
4140-00-891-2090B2054 INTERCHANGEABLE
Impeller,fan,centrifugal
Dcm Manufacturing, Inc.
4520-01-088-762720081 INTERCHANGEABLE
Hub,fan,heater
C-Way Industries Inc
3040-01-091-38392008-1 INTERCHANGEABLE
Connecting Link,rigid
Tyee Aircraft Inc Div Tyee Aircraft
Cross-Reference Index
Part NumberManufacturer
20081 Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
20081C51M PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
20081C51M Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
Related Parts
3110-00-144-8869INTERCHANGEABLE
BEARING,BALL,ANNULAR
R-200ZZSD502RDA1P15LY48U
5342-00-147-6399INTERCHANGEABLE
CAP,SHIPPING
20081
3455-00-236-3637INTERCHANGEABLE
REAMER,MACHINE
5330-00-251-4057INTERCHANGEABLE
GASKET
24609
4130-00-400-2418INTERCHANGEABLE
REGULATOR,PRESSURE
ERP12 7-8IN0DF
6350-00-410-8540INTERCHANGEABLE
KNOB ASSEMBLY,PANEL
20081
5315-00-786-3998INTERCHANGEABLE
PIN,LOCK
13554
4140-00-891-2090INTERCHANGEABLE
IMPELLER,FAN,CENTRIFUGAL
B2054
4520-01-088-7627INTERCHANGEABLE
HUB,FAN,HEATER
20081
3040-01-091-3839INTERCHANGEABLE
CONNECTING LINK,RIGID
2008-1
1680-01-121-3177INTERCHANGEABLE
PANEL,WEAPON CONTRO
20081
5995-01-370-8587INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
20081

Frequently Asked Questions

What is NSN 4820-01-285-0689?

NSN 4820-01-285-0689 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-285-0689?

NSN 4820-01-285-0689 has 3 cross-referenced part numbers: 20081 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20081C51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20081C51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).

What NSN replaces 4820-01-285-0689?

There are 12 known substitutes for 4820-01-285-0689: 3110-00-144-8869, 5342-00-147-6399, 3455-00-236-3637 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20081C51M?

Key specifications for 20081C51M: Adjustable Pressure Range: +15.0 TO 19.0 POUNDS PER SQUARE INCH LBS; Connection Type: FLANGE FIRST END; Disk Loading Method: SPRING; Material: COPPER ALLOY BODY. 8 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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