The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-659-4629, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 27 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-659-4629 |
| Item Name | Valve,regulating,fluid Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | BELLOWS AND BELLOWS AND DIAPHRAGMDIAPHRAGM |
| Renewable Seat Ring Type | ANY ACCEPTABLEANY ACCEPTABLE |
| First End Thread Direction | RIGHT-HANDRIGHT-HAND |
| Second End Relationship with First End | NOT IDENTICALNOT IDENTICAL |
| Remote Actuation Method | BELLOWS AND BELLOWS AND DIAPHRAGMDIAPHRAGM |
| Body Style | STRAIGHT THRUSTRAIGHT THRU |
| Regulation Type | MANUAL SINGLE STAGEMANUAL SINGLE STAGE |
| First End Seat Angle in Deg | 45.045.0 |
| First End Thread Class | 2A2A |
| First End Style Designator | SWIVEL NUT, FLARESWIVEL NUT, FLARE |
| End Connection Quantity | 22 |
| Second End Thread Direction | RIGHT-HANDRIGHT-HAND |
| Manual Control Method | KNOBKNOB |
| Valve Loading Method | BELLOWSBELLOWS |
| Mounting Facility | EXTERNAL THREADEXTERNAL THREAD |
| Second End Style Designator | GASKET SEALGASKET SEAL |
| First End Connection Type | THREADED EXTERNAL TUBETHREADED EXTERNAL TUBE |
| First End Outside Diameter Tube Accommodated | 0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN |
| Material | BRASS AND BRASS AND STEEL CORROSION RESISTING SEATSTEEL CORROSION RESISTING SEAT |
| Material | COPPER ALLOY AND COPPER ALLOY AND COPPER ALLOY FLOW CONTROL DEVICECOPPER ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY STEMCOPPER ALLOY STEM |
| Media for Which Designed | REFRIGERANT, NONCORROSIVEREFRIGERANT, NONCORROSIVE |
| Maximum Inlet Pressure Rating | ERR-060 |
| Second End Connection Type | THREADED EXTERNAL PIPETHREADED EXTERNAL PIPE |
| Thread Size and Series/type Designator | 0.125-27 NPT SECOND END0.125-27 NPT SECOND END |
| Thread Size and Series/type Designator | 0.500-20 UNF FIRST END0.500-20 UNF FIRST END |
| Filter | NOT INCLUDEDNOT INCLUDED |
| 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 |
|---|---|
| 2355S206 | 3/9 Design control — primary reference U.S. Government activity |
| 235S40375 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-659-4629 is a Valve,regulating,fluid Pressure, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-00-659-4629: Flow Control Device: BELLOWS AND BELLOWS AND DIAPHRAGMDIAPHRAGM; Renewable Seat Ring Type: ANY ACCEPTABLEANY ACCEPTABLE; First End Thread Direction: RIGHT-HANDRIGHT-HAND; Second End Relationship with First End: NOT IDENTICALNOT IDENTICAL. 27 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.