PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

023-00034Valve,safety Relief

Hdt Expeditionary Systems Inc · NSN 4820-01-559-8210 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-559-8210 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-559-8210. Primary manufacturer part number: 023-00034.
Features
  • Valve,safety Relief — FSC 4820
  • 1 verified cross-reference
  • Primary manufacturer: Hdt Expeditionary Systems Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-559-8210, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hdt Expeditionary Systems Inc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-559-8210
Primary Part Number023-00034
Item NameValve,safety Relief
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerHdt Expeditionary Systems Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5961-00-943-8923 INTERCHANGEABLE
Rectifier,semiconductor Device,u
5961-01-142-7659 INTERCHANGEABLE
Semiconductor Device,diode
Cross-Reference Index
Part NumberManufacturer
023-00034 PRIMARY Hdt Expeditionary Systems Inc (USA)
Related Parts
5961-00-943-8923INTERCHANGEABLE
RECTIFIER,SEMICONDUCTOR DEVICE,U
5961-01-142-7659INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE

Frequently Asked Questions

What is NSN 4820-01-559-8210?

NSN 4820-01-559-8210 is a Valve,safety Relief, manufactured by Hdt Expeditionary Systems Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-559-8210?

NSN 4820-01-559-8210 has 1 cross-referenced part number: 023-00034 (Hdt Expeditionary Systems Inc).

What NSN replaces 4820-01-559-8210?

There are 2 known substitutes for 4820-01-559-8210: 5961-00-943-8923, 5961-01-142-7659. Verify interchangeability with system specifications before substitution.

What are the specifications of 023-00034?

Key specifications for 023-00034: Part Name Assigned by Controlling Agency: VALVE-HOT GAS BY-PASS; End Item Identification: ENVIRONMENTAL CONTROL UNIT (ECU); 4120-01-551-9191; TM9-4120-451-13ANDP. 2 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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