The Valve,safety Relief, cataloged under National Stock Number 4820-01-537-7990, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Liquiflo Equipment Co. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-537-7990 |
| Primary Part Number | RV1000 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Liquiflo Equipment Co |
| Status | ACTIVE |
| Flow Control Device | O-RING, DILATING OR STEM |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 60.0 CELSIUS SINGLE RESPONSE DEGC |
| Media for Which Designed | LIQUID SINGLE RESPONSE |
| Material | STEEL COMP 316 OVERALL |
| Opening Pressure Setting | 7.5 BAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-537-7990 is a Valve,safety Relief, manufactured by Liquiflo Equipment Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-7990 has 2 manufacturer part numbers on file: RV1000 (Liquiflo Equipment Co), RV1000 (Saab Aktiebolag Div Radar Solutions).
Key specifications for RV1000: Flow Control Device: O-RING, DILATING OR STEM; Operating Pressure: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 60.0 CELSIUS SINGLE RESPONSE DEGC; Special Features: STORAGE TEMPERATURE RANGE NEG 50 TO POS 70 DEG CELSIUS. 6 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.