PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

45120-01BValve,safety Relief

Griswold Industries Dba Cla-Val Co · NSN 4820-01-428-6423 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-428-6423 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-428-6423. Primary manufacturer part number: 45120-01B.
Features
  • Valve,safety Relief — FSC 4820
  • Style Designator: STRAIGHT THRU FLANGED ENDS NOTE:TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
  • Material: COPPER ALLOY BODY
  • Face to Face Distance: 12.000 INCHES IN
  • Valve Size: 3.000 INCHES IN
  • Material: NICKEL ALLOY FLOW CONTROL DEVICE
  • Flange Face Design: PLAIN ALL ENDS
  • Bolt Hole Quantity: 8 ALL ENDS
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 4820-01-428-6423, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Griswold Industries Dba Cla-Val Co. Government technical data includes 19 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
NSN4820-01-428-6423
Primary Part Number45120-01B
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerGriswold Industries Dba Cla-Val Co
StatusACTIVE
Style DesignatorSTRAIGHT THRU FLANGED ENDS NOTE:TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.
MaterialCOPPER ALLOY BODY
Face to Face Distance12.000 INCHES IN
Valve Size3.000 INCHES IN
MaterialNICKEL ALLOY FLOW CONTROL DEVICE
Flange Face DesignPLAIN ALL ENDS
Bolt Hole Quantity8 ALL ENDS
Bolt Hole Nominal Diameter0.563 INCHES ALL ENDS IN
Bonnet Attachment MethodUNION
Disk Loading MethodSPRING
Furnished Items and Quantity1 STRAINER
Valve Operation MethodAUTOMATIC
Nominal Outside Diameter6.630 INCHES ALL ENDS IN
Adjustable Pressure Range+10.0 TO 100.0 POUNDS PER SQUARE INCH LBS
Bolt Circle Nominal Diameter5.500 INCHES ALL ENDS IN
Flange ShapeROUND WITH HOLES ALL ENDS
Nominal Thickness0.500 INCHES ALL ENDS IN
Connection TypeFLANGE ALL ENDS
Bonnet TypeINSIDE SPRING
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3455-00-232-903758-10127 INTERCHANGEABLE
Cutter,milling,side
Union Butterfield Corp P O Box 9000 Crystal Lake Il 60039
5120-00-237-4973 INTERCHANGEABLE
Socket,socket Wrench
5110-00-246-0975PD5110-00-246-0975 INTERCHANGEABLE
Stripper,wire,hand
General Services Administration Federal Supply Service
5210-00-273-19485210-00-273-1948 INTERCHANGEABLE
Square,carpenter's
General Services Administration Federal Supply Service
4730-00-430-3165 INTERCHANGEABLE
Bushing,pipe
5998-00-488-5305SMD2015847 INTERCHANGEABLE
Circuit Card Assembly
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
2990-01-123-0391 INTERCHANGEABLE
Bellows,exhaust
4820-01-187-681274379K 86184 INTERCHANGEABLE
Valve,globe
Griswold Industries Dba Cla-Val Co
4910-01-230-1169 INTERCHANGEABLE
Arm,calibration
7920-01-233-749345120 INTERCHANGEABLE
Brush,bottle and Buret
Maryland Brush Company
Cross-Reference Index
Part NumberManufacturer
45120 Griswold Industries Dba Cla-Val Co (USA)
45120-01B PRIMARY Griswold Industries Dba Cla-Val Co (USA)
Related Parts
3455-00-232-9037INTERCHANGEABLE
CUTTER,MILLING,SIDE
58-10127
5120-00-237-4973INTERCHANGEABLE
SOCKET,SOCKET WRENCH
5110-00-246-0975INTERCHANGEABLE
STRIPPER,WIRE,HAND
PD5110-00-246-0975
5210-00-273-1948INTERCHANGEABLE
SQUARE,CARPENTER'S
5210-00-273-1948
4730-00-430-3165INTERCHANGEABLE
BUSHING,PIPE
5998-00-488-5305INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
SMD2015847
2990-01-123-0391INTERCHANGEABLE
BELLOWS,EXHAUST
4820-01-187-6812INTERCHANGEABLE
VALVE,GLOBE
74379K 86184
4910-01-230-1169INTERCHANGEABLE
ARM,CALIBRATION
7920-01-233-7493INTERCHANGEABLE
BRUSH,BOTTLE AND BURET
45120
6850-01-305-9759INTERCHANGEABLE
COMPOUND KIT,RUST PREVENTIVE
45127
5340-01-356-4802INTERCHANGEABLE
STRAP,RETAINING
45120

Frequently Asked Questions

What is NSN 4820-01-428-6423?

NSN 4820-01-428-6423 is a Valve,safety Relief, manufactured by Griswold Industries Dba Cla-Val Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-428-6423?

NSN 4820-01-428-6423 has 2 cross-referenced part numbers: 45120 (Griswold Industries Dba Cla-Val Co), 45120-01B (Griswold Industries Dba Cla-Val Co).

What NSN replaces 4820-01-428-6423?

There are 12 known substitutes for 4820-01-428-6423: 3455-00-232-9037, 5120-00-237-4973, 5110-00-246-0975 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 45120-01B?

Key specifications for 45120-01B: Style Designator: STRAIGHT THRU FLANGED ENDS NOTE:TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.; Material: COPPER ALLOY BODY; Face to Face Distance: 12.000 INCHES IN; Valve Size: 3.000 INCHES IN. 20 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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