The Valve,safety Relief, cataloged under National Stock Number 4820-00-374-3514, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydro-Test Products, Inc. Dba Hydro-Test Products Inc. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-374-3514 |
| Primary Part Number | 53734 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydro-Test Products, Inc. Dba Hydro-Test Products Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 GASKET |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END |
| Connection Style | SWIVEL NUT,GASKET SEAL(TUBE) FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 0.625 INCHES FIRST END IN |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES SECOND END IN |
| Nominal Thread Size | 0.875 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Thread Class | 2A SECOND END A |
| Thread Class | 2B FIRST END |
| Thread Quantity Per Inch | 18 SECOND END |
| Material | COPPER ALLOY BODY |
| Thread Series Designator | UNS SECOND END |
| Thread Series Designator | UNF FIRST END |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 53734 PRIMARY | Hydro-Test Products, Inc. Dba Hydro-Test Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 53734 | 5/9 Secondary reference Fyr-Fyter Co Inc |
NSN 4820-00-374-3514 is a Valve,safety Relief, manufactured by Hydro-Test Products, Inc. Dba Hydro-Test Products Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-374-3514 has 1 manufacturer part number on file: 53734 (Hydro-Test Products, Inc. Dba Hydro-Test Products Inc).
1 possible match (shared part number, not a government interchangeability claim): 2530-01-602-5996. Verify interchangeability with system specifications before substitution.
Key specifications for 53734: Flow Control Device: DISK; Furnished Items and Quantity: 1 GASKET; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END; Connection Style: SWIVEL NUT,GASKET SEAL(TUBE) FIRST END. 20 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.
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.