The Valve,safety Relief, cataloged under National Stock Number 4820-01-263-0027, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 23 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-263-0027 |
| Primary Part Number | 20263U51SS |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Bolt Hole Nominal Diameter | 0.625 INCHES ALL ENDS IN |
| Raised Face Nominal Diameter | 1.375 INCHES ALL ENDS IN |
| Material | STEEL CORROSION RESISTING FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| Style Designator | ANGLE FLANGED ENDS |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Operating Pressure | 275.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Maximum Operating Temp | 450.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Bolt Hole Quantity | 4 ALL ENDS |
| Connection Type | FLANGE ALL ENDS |
| Flow Control Device | DISK |
| Nominal Thickness | 0.438 INCHES ALL ENDS IN |
| First Connection Face to Centerline Distance | 3.250 INCHES IN |
| Nominal Outside Diameter | 3.500 INCHES ALL ENDS IN |
| Material | STEEL CORROSION RESISTING STEM |
| Second Connection Face to Centerline Distance | 3.250 INCHES IN |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Material | STEEL BODY |
| Material | STEEL CORROSION RESISTING SEAT |
| Adjustable Pressure Range | +125.0 TO 139.0 POUNDS PER SQUARE INCH LBS |
| Bolt Circle Nominal Diameter | 2.375 INCHES ALL ENDS IN |
| Valve Size | 0.500 INCHES IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 20263 | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| 20263U51SS PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20263U51SS | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
NSN 4820-01-263-0027 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-263-0027 has 3 cross-referenced part numbers: 20263 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby), 20263U51SS (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20263U51SS (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
There are 8 known substitutes for 4820-01-263-0027: 5977-00-234-9577, 5935-00-259-4636, 4820-01-050-9075 and 5 more. Verify interchangeability with system specifications before substitution.
Key specifications for 20263U51SS: Bolt Hole Nominal Diameter: 0.625 INCHES ALL ENDS IN; Raised Face Nominal Diameter: 1.375 INCHES ALL ENDS IN; Material: STEEL CORROSION RESISTING FLOW CONTROL DEVICE; Valve Operation Method: AUTOMATIC. 23 total characteristics are documented in the Federal Logistics Information System.