PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20210R51MValve,safety Relief

Emerson Automation Solutions Final Control Us Lp Div Navy Product Team · NSN 4820-01-053-0598 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-053-0598 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-053-0598. Primary manufacturer part number: 20210R51M.
Features
  • Valve,safety Relief — FSC 4820
  • Connection Style: SOCKET WITH BRAZING RING ALL ENDS
  • Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
  • Media for Which Designed: WATER-OIL-GAS SINGLE RESPONSE
  • Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS
  • Adjustable Pressure Range: +151.0 TO 180.0 POUNDS PER SQUARE INCH LBS
  • Material: NICKEL ALLOY SEAT
  • Maximum Operating Temp: 165.0 FAHRENHEIT SINGLE RESPONSE DEGF
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Nickel Alloy Seat construction
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-053-0598, 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 17 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
NSN4820-01-053-0598
Primary Part Number20210R51M
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEmerson Automation Solutions Final Control Us Lp Div Navy Product Team
StatusACTIVE
Connection StyleSOCKET WITH BRAZING RING ALL ENDS
Operating Pressure400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Media for Which DesignedWATER-OIL-GAS SINGLE RESPONSE
Connection TypeUNTHREADED INTERNAL PIPE ALL ENDS
Adjustable Pressure Range+151.0 TO 180.0 POUNDS PER SQUARE INCH LBS
MaterialNICKEL ALLOY SEAT
Maximum Operating Temp165.0 FAHRENHEIT SINGLE RESPONSE DEGF
Material Document and ClassificationQQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY
Valve Operation MethodAUTOMATIC
Style DesignatorANGLE
Material Document and ClassificationQQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
MaterialNICKEL ALLOY FLOW CONTROL DEVICE
Disk Loading MethodSPRING
Flow Control DeviceDISK
Material Document and ClassificationQQ-N-281,CLASS A FED SPEC SINGLE MATERIAL RESPONSE SEAT
Nominal Pipe Size Accommodated0.500 INCHES ALL ENDS IN
MaterialCOPPER ALLOY BODY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4310-00-168-8725 INTERCHANGEABLE
Guard,valve Strip
5935-00-216-7435 INTERCHANGEABLE
Connector,plug,electrical
5915-00-393-1813SM-C-171582 INTERCHANGEABLE
Filter,radio Frequency Interfere
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
3110-00-554-6101C63293-10 INTERCHANGEABLE
Bearing,ball,annular
Raytheon Company Dba Raytheon Co
4820-01-134-126020210G51M INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
6550-01-139-748020210 INTERCHANGEABLE
Test Kit,yeast Identification
Biomerieux Inc
5330-01-145-159620210GRBN-STL A105 INTERCHANGEABLE
Retainer,packing
Flowserve Inc
5961-01-169-4684 INTERCHANGEABLE
Semiconductor Device,diode
4820-01-198-110420210J02S0045 INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-220-3572 INTERCHANGEABLE
Valve,relief,pressure and Temper
Cross-Reference Index
Part NumberManufacturer
20210 Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
20210R51M Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
20210R51M PRIMARY Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA)
Related Parts
4310-00-168-8725INTERCHANGEABLE
GUARD,VALVE STRIP
5935-00-216-7435INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
5915-00-393-1813INTERCHANGEABLE
FILTER,RADIO FREQUENCY INTERFERE
SM-C-171582
3110-00-554-6101INTERCHANGEABLE
BEARING,BALL,ANNULAR
C63293-10
4820-01-134-1260INTERCHANGEABLE
VALVE,SAFETY RELIEF
20210G51M
6550-01-139-7480INTERCHANGEABLE
TEST KIT,YEAST IDENTIFICATION
20210
5330-01-145-1596INTERCHANGEABLE
RETAINER,PACKING
20210GRBN-STL A105
5961-01-169-4684INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE
4820-01-198-1104INTERCHANGEABLE
VALVE,SAFETY RELIEF
20210J02S0045
4820-01-220-3572INTERCHANGEABLE
VALVE,RELIEF,PRESSURE AND TEMPER
6685-01-258-9238INTERCHANGEABLE
INDICATOR,TEMPERATURE,CARD
20-210
2530-01-264-4690INTERCHANGEABLE
CYLINDER ASSEMBLY,HYDRAULIC BRAK
20210

Frequently Asked Questions

What is NSN 4820-01-053-0598?

NSN 4820-01-053-0598 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 4820-01-053-0598?

NSN 4820-01-053-0598 has 3 cross-referenced part numbers: 20210 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20210R51M (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20210R51M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).

What NSN replaces 4820-01-053-0598?

There are 12 known substitutes for 4820-01-053-0598: 4310-00-168-8725, 5935-00-216-7435, 5915-00-393-1813 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20210R51M?

Key specifications for 20210R51M: Connection Style: SOCKET WITH BRAZING RING ALL ENDS; Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Media for Which Designed: WATER-OIL-GAS SINGLE RESPONSE; Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS. 17 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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