The Valve,check, cataloged under National Stock Number 4820-01-116-6691, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-116-6691 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 1.000 INCHES ALL ENDS IN |
| Connection Style | STREAMLINED WITH ONE BRAZING RING (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Maximum Operating Temp | 550.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 150.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | COPPER ALLOY 922 OVERALL |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 803-1385721ASSY1IN | 3/2 Design control — primary reference U.S. Government activity |
| 420WS | 5/9 Secondary reference The Walworth Company |
| 0642 1IN SIL-BRAZE | 5/9 Secondary reference Zidell Valve Corp |
| 2530-29 | 5/9 Secondary reference Flowserve Corporation Dba Flowserve Div Services Business Unit |
NSN 4820-01-116-6691 is a Valve,check, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 9150-01-725-4110. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-116-6691: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 1.000 INCHES ALL ENDS IN; Connection Style: STREAMLINED WITH ONE BRAZING RING (PIPE) ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 15 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.