The Valve Assembly, cataloged under National Stock Number 4820-01-135-6591, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-135-6591 |
| Primary Part Number | 20435-005Q5 |
| Item Name | Valve Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | AN ITEM THAT SUPPORTS SUBSAFE CRITICAL SYSTEMS AND REQUIRES OBJECTIVE QUALITY EVIDENCE THAT QUALITY ASSURANCE REQUIREMENTS HAVE BEEN MET, INCLUDING CERTIFICATION OF TEST FOR HYDROSTATIC AND/OR OPERATIONAL TESTING AND ITEM SER IALIZATION TRACEABLE TO THE CERTIFICATIONS DURING INITIAL PROCUREMENT AND ANYSUBSEQUENT REPAIRS. GOVERNMENT SOURCES INSPECTION IS INVOLVED. |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 20435-005Q5 | Naval Inventory Control Point Mechanicsburg (USA) |
| 20435-001,PARTNUMBER 20435-005Q5 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 20435-005 | 3/1 Design control — primary reference Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
| 20435-001, PART NUMBER 20435-005 | 5/1 Secondary reference Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
NSN 4820-01-135-6591 is a Valve Assembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-135-6591 has 2 manufacturer part numbers on file: 20435-005Q5 (Naval Inventory Control Point Mechanicsburg), 20435-001,PARTNUMBER 20435-005Q5 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 20435-005Q5: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: AN ITEM THAT SUPPORTS SUBSAFE CRITICAL SYSTEMS AND REQUIRES OBJECTIVE QUALITY EVIDENCE THAT QUALITY ASSURANCE REQUIREMENTS HAVE BEEN MET, INCLUDING CERTIFICATION OF TEST FOR HYDROSTATIC AND/OR OPERATIONAL TESTING AND ITEM SER IALIZATION TRACEABLE TO THE CERTIFICATIONS DURING INITIAL PROCUREMENT AND ANYSUBSEQUENT REPAIRS. GOVERNMENT SOURCES INSPECTION IS INVOLVED.. 2 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-01-135-6591 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.