The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-493-2194, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 29 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-493-2194 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| First End Bolt Hole Quantity | 8 |
| Flow Control Device | DISK, FLAT AND DISK, CIRCULAR |
| Valve Stem Design | SINGLE SEAT |
| First End Width Across Flats | 3.750 INCHES NOMINAL IN |
| Second End Relationship with First End | IDENTICAL |
| Second End Flange Width | 4.250 INCHES NOMINAL IN |
| Body Style | STRAIGHT THRU |
| Regulation Type | AUTOMATIC SINGLE STAGE |
| First End Flange Thickness | 0.750 INCHES NOMINAL IN |
| First End Flange Outside Diameter | 4.250 INCHES NOMINAL IN |
| First End Style Designator | PLAIN |
| First End Flange Width | 4.250 INCHES NOMINAL IN |
| Second End Bolt Hole Quantity | 8 |
| First End Bolt Hole Diameter | 0.343 INCHES NOMINAL IN |
| First End Bolt Circle Diameter | 4.109 INCHES NOMINAL IN |
| End Connection Quantity | 2 |
| Second End Flange Thickness | 0.750 INCHES NOMINAL IN |
| Valve Loading Method | SPRING |
| Second End Bolt Circle Diameter | 4.109 INCHES NOMINAL IN |
| Second End Style Designator | PLAIN |
| Second End Flange Shape Style | ROUND W/ BOLT HOLES |
| First End Connection Type | PLAIN FACE FLANGE |
| Second End Flange Outside Diameter | 4.250 INCHES NOMINAL IN |
| First End Flange Shape Style | ROUND W/ BOLT HOLES |
| Material | COPPER ALLOY STEM |
| Material | COPPER ALLOY SEAT |
| First End Flange Length | 8.000 INCHES NOMINAL IN |
| Media for Which Designed | WATER, OIL OR GAS |
| Maximum Inlet Pressure Rating | ERR-060 |
| 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 |
|---|---|
| ANAP949X4-202 | 3/9 Design control — primary reference Atlas Valve Co |
| NAP949 | D/9 Drawing number reference only Atlas Valve Co |
| NAP949/CDS-1ASSY ANAP949X4-202 | 5/9 Secondary reference Atlas Valve Co |
NSN 4820-01-493-2194 is a Valve,regulating,fluid Pressure, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-493-2439, 4820-01-493-2449. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-493-2194: First End Bolt Hole Quantity: 8; Flow Control Device: DISK, FLAT AND DISK, CIRCULAR; Valve Stem Design: SINGLE SEAT; First End Width Across Flats: 3.750 INCHES NOMINAL IN. 29 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.