PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

E9921M51MValve,safety Relief

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-174-3633 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-174-3633 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-174-3633. Primary manufacturer part number: E9921M51M.
Features
  • Valve,safety Relief — FSC 4820
  • Bonnet Attachment Method: INTEGRAL
  • Material: COPPER ALLOY BODY
  • Material: NICKEL ALLOY SEAT
  • Adjustable Pressure Range: +91.0 TO 105.0 POUNDS PER SQUARE INCH LBS
  • Material: NICKEL ALLOY STEM
  • Renewable Seat Ring Type: THREADED
  • Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
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 4820-01-174-3633, 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 18 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
NSN4820-01-174-3633
Primary Part NumberE9921M51M
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusACTIVE
Bonnet Attachment MethodINTEGRAL
MaterialCOPPER ALLOY BODY
MaterialNICKEL ALLOY SEAT
Adjustable Pressure Range+91.0 TO 105.0 POUNDS PER SQUARE INCH LBS
MaterialNICKEL ALLOY STEM
Renewable Seat Ring TypeTHREADED
Operating Pressure400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Disk Loading MethodSPRING
Valve Operation MethodAUTOMATIC
Connection TypeUNTHREADED INTERNAL PIPE ALL ENDS
Nominal Pipe Size Accommodated0.375 INCHES FIRST END IN
Flow Control DeviceDISK
MaterialNICKEL ALLOY FLOW CONTROL DEVICE
Bonnet TypeINSIDE SPRING
Connection StyleSOCKET WITH BRAZING RING ALL ENDS
Style DesignatorANGLE
Media for Which DesignedWATER-OIL-GAS SINGLE RESPONSE
Maximum Operating Temp150.0 FAHRENHEIT SINGLE RESPONSE DEGF
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5120-00-156-0969 INTERCHANGEABLE
Bit,screwdriver
6625-00-197-303409920 INTERCHANGEABLE
Voltmeter
Simpson Electric Company, Inc.
5935-00-240-8169JS7 INTERCHANGEABLE
Socket,plug-in Electronic Compon
New London Instrument Co
5130-00-889-89865130-00-889-8986 INTERCHANGEABLE
Sander,belt,electric,portable
General Services Administration Federal Supply Service
4820-01-174-9367E9922S51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-175-6357E9920R51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-176-2045E9920Q51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-200-93590992201S0056 INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-263-0873E9920M51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-265-0412E9922H51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
Cross-Reference Index
Part NumberManufacturer
9920 Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
E9921M51M PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
E9921M51M Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
Related Parts
5120-00-156-0969INTERCHANGEABLE
BIT,SCREWDRIVER
6625-00-197-3034INTERCHANGEABLE
VOLTMETER
09920
5935-00-240-8169INTERCHANGEABLE
SOCKET,PLUG-IN ELECTRONIC COMPON
JS7
5130-00-889-8986INTERCHANGEABLE
SANDER,BELT,ELECTRIC,PORTABLE
5130-00-889-8986
4820-01-174-9367INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9922S51M
4820-01-175-6357INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9920R51M
4820-01-176-2045INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9920Q51M
4820-01-200-9359INTERCHANGEABLE
VALVE,SAFETY RELIEF
0992201S0056
4820-01-263-0873INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9920M51M
4820-01-265-0412INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9922H51M
4820-01-266-3640INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9922G51M
4820-01-274-4727INTERCHANGEABLE
VALVE,SAFETY RELIEF
E9920P51M

Frequently Asked Questions

What is NSN 4820-01-174-3633?

NSN 4820-01-174-3633 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 4820-01-174-3633?

NSN 4820-01-174-3633 has 3 cross-referenced part numbers: 9920 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), E9921M51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), E9921M51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).

What NSN replaces 4820-01-174-3633?

There are 12 known substitutes for 4820-01-174-3633: 5120-00-156-0969, 6625-00-197-3034, 5935-00-240-8169 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of E9921M51M?

Key specifications for E9921M51M: Bonnet Attachment Method: INTEGRAL; Material: COPPER ALLOY BODY; Material: NICKEL ALLOY SEAT; Adjustable Pressure Range: +91.0 TO 105.0 POUNDS PER SQUARE INCH LBS. 18 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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