The Valve,safety Relief, cataloged under National Stock Number 4820-01-116-5952, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is O. C. Keckley Company. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-116-5952 |
| Primary Part Number | 135ESTL-S2ANDD58006 25T35PSI |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | O. C. Keckley Company |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 2 NUT AND 2 TAILPIECE |
| Renewable Seat Ring Type | THREADED |
| Connection Style | SOCKET WITH BRAZING RING (TUBE) ALL ENDS |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | ANGLE |
| Nominal Outside Diameter Tube Accommodated | 1.770 INCHES ALL ENDS IN |
| Adjustable Pressure Range | +25.0 TO 35.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | EXPOSED SPRING |
| Bonnet Attachment Method | BOLTED |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 135ESTL-S2ANDD58006 25T35PSI PRIMARY | O. C. Keckley Company (USA) |
| Reference | Meaning |
|---|---|
| D-58006 | D/9 Drawing number reference only O. C. Keckley Company |
NSN 4820-01-116-5952 is a Valve,safety Relief, manufactured by O. C. Keckley Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-116-5952 has 1 manufacturer part number on file: 135ESTL-S2ANDD58006 25T35PSI (O. C. Keckley Company).
Key specifications for 135ESTL-S2ANDD58006 25T35PSI: Flow Control Device: DISK; Furnished Items and Quantity: 2 NUT AND 2 TAILPIECE; Renewable Seat Ring Type: THREADED; Connection Style: SOCKET WITH BRAZING RING (TUBE) ALL ENDS. 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.