The Valve,stop-Check, cataloged under National Stock Number 4820-00-494-0899, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-494-0899 |
| Item Name | Valve,stop-Check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 4.000 INCHES ALL ENDS IN |
| Connection Style | BEVELED (PIPE) ALL ENDS |
| Mounting Position | HORIZONTAL |
| Connection Type | BUTT WELD PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | MIL-R-17131,MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | MIL-R-17131,MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM A105, GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Features Provided | BONNET PACKING |
| Bonnet Type | OUTSIDE SCREW-YOKE |
| Maximum Operating Temp | 775.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nondefinitive Spec/std Data | D COMPOSITION |
| Bonnet Attachment Method | PRESSURE SEAL, RING TYPE |
| Media for Which Designed | STEAM SINGLE RESPONSE |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Material | STEEL CORROSION RESISTING STEM |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| MC-025-D 4IN | C/1 Advisory reference — outside the item-of-supply concept Newmans Inc New Jersey Div |
| CS4820-0015DBDTBRQD | 5/9 Secondary reference Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings) |
| MIL-DTL-22052 | 4/1 Identification reference U.S. Government activity |
| B12-2084P-02TS | C/1 Advisory reference — outside the item-of-supply concept Velan Valve Corp. |
| MILV22052 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-494-0899 is a Valve,stop-Check, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-494-0899: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 4.000 INCHES ALL ENDS IN; Connection Style: BEVELED (PIPE) ALL ENDS; Mounting Position: HORIZONTAL. 21 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.