PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

81-540Valve,regulating,fluid Pressure

Matheson Co Div of G D Searle Medical Products · NSN 4820-00-617-6506 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-617-6506 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-617-6506. Primary manufacturer part number: 81-540.
Features
  • Valve,regulating,fluid Pressure — FSC 4820
  • Flow Control Device: DISKDISK
  • End Connection Quantity: 22
  • First End Style Designator: PLAINPLAIN
  • Material: COPPER ALLOY BODYCOPPER ALLOY BODY
  • Media for Which Designed: OXYGEN, GASEOUSOXYGEN, GASEOUS
  • Thread Size and Series/type Designator: 0.908-14 NGO SECOND END0.908-14 NGO SECOND END
  • Thread Size and Series/type Designator: 1/4-18 NPT FIRST END1/4-18 NPT FIRST END
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy Bodycopper Alloy Body construction
General Description

The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-617-6506, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Matheson Co Div of G D Searle Medical Products. Government technical data includes 22 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, 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
NSN4820-00-617-6506
Primary Part Number81-540
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMatheson Co Div of G D Searle Medical Products
StatusACTIVE
Flow Control DeviceDISKDISK
End Connection Quantity22
First End Style DesignatorPLAINPLAIN
MaterialCOPPER ALLOY BODYCOPPER ALLOY BODY
Media for Which DesignedOXYGEN, GASEOUSOXYGEN, GASEOUS
Thread Size and Series/type Designator0.908-14 NGO SECOND END0.908-14 NGO SECOND END
Thread Size and Series/type Designator1/4-18 NPT FIRST END1/4-18 NPT FIRST END
Second End Connection TypeTHREADED INTERNAL GAS CYLINDERTHREADED INTERNAL GAS CYLINDER
MaterialSTEEL FLOW CONTROL DEVICESTEEL FLOW CONTROL DEVICE
FilterNOT INCLUDEDNOT INCLUDED
Body StyleANGLEANGLE
First End Connection TypeTHREADED EXTERNAL PIPETHREADED EXTERNAL PIPE
Furnished ItemsINLET PRESSURE GAGE AND INLET PRESSURE GAGE AND OUTLET PRESSURE GAGEOUTLET PRESSURE GAGE
Outlet Pressure Range0.0 TO 100.0 CAMERA MOUNT
Second End Relationship with First EndNOT IDENTICALNOT IDENTICAL
Maximum Inlet Pressure RatingERR-060
Valve Loading MethodSPRINGSPRING
Second End Style DesignatorSWIVEL NUT, GASSWIVEL NUT, GAS
Second End Thread DirectionRIGHT-HANDRIGHT-HAND
First End Thread DirectionRIGHT-HANDRIGHT-HAND
Regulation TypeAUTOMATIC DOUBLE STAGEAUTOMATIC DOUBLE STAGE
Renewable Seat Ring TypeTHREADEDTHREADED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4940-00-006-09658-540 INTERCHANGEABLE
Maintenance Platform
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5365-00-133-36628540 INTERCHANGEABLE
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5305-00-207-5482815-40 INTERCHANGEABLE
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Elbitamerica, Inc.
5950-00-229-9797 INTERCHANGEABLE
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5310-00-262-03597612520 INTERCHANGEABLE
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Us Army Aviation and Missile Command
5310-00-264-1151200074PC5 INTERCHANGEABLE
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Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
6680-00-592-55928540-00 INTERCHANGEABLE
Indicator,oxygen Flow
Avox Systems Inc Dba Avox Systems Inc
3030-01-047-02968540 INTERCHANGEABLE
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Contitech Usa, Inc Dba Veyance Technologies
4820-01-185-2291E8540D51M INTERCHANGEABLE
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Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-192-4346E8540AF51M INTERCHANGEABLE
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Cross-Reference Index
Part NumberManufacturer
8-540 Matheson Co Div of G D Searle Medical Products (USA)
81-540 PRIMARY Matheson Co Div of G D Searle Medical Products (USA)
Related Parts
4940-00-006-0965INTERCHANGEABLE
MAINTENANCE PLATFORM
8-540
5365-00-133-3662INTERCHANGEABLE
SPACER,SLEEVE
8540
5305-00-207-5482INTERCHANGEABLE
SETSCREW
815-40
5950-00-229-9797INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
5310-00-262-0359INTERCHANGEABLE
WASHER,LOCK
7612520
5310-00-264-1151INTERCHANGEABLE
WASHER,LOCK
200074PC5
6680-00-592-5592INTERCHANGEABLE
INDICATOR,OXYGEN FLOW
8540-00
3030-01-047-0296INTERCHANGEABLE
BELT,V
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4820-01-185-2291INTERCHANGEABLE
VALVE,SAFETY RELIEF
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4820-01-192-4346INTERCHANGEABLE
VALVE,SAFETY RELIEF
E8540AF51M
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KNOB,BACK TOGGER
081540
4940-01-217-5039INTERCHANGEABLE
CUP,PAINT,SPRAY GUN
81-540

Frequently Asked Questions

What is NSN 4820-00-617-6506?

NSN 4820-00-617-6506 is a Valve,regulating,fluid Pressure, manufactured by Matheson Co Div of G D Searle Medical Products, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-617-6506?

NSN 4820-00-617-6506 has 2 cross-referenced part numbers: 8-540 (Matheson Co Div of G D Searle Medical Products), 81-540 (Matheson Co Div of G D Searle Medical Products).

What NSN replaces 4820-00-617-6506?

There are 12 known substitutes for 4820-00-617-6506: 4940-00-006-0965, 5365-00-133-3662, 5305-00-207-5482 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 81-540?

Key specifications for 81-540: Flow Control Device: DISKDISK; End Connection Quantity: 22; First End Style Designator: PLAINPLAIN; Material: COPPER ALLOY BODYCOPPER ALLOY BODY. 22 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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